HAIR WEFT AND PREPARATION PROCESS THEREOF

Abstract

A hair weft includes a hair transplantation base and a first hair strand including a plurality of first hair elements, each first hair element includes a first end fixing end portion, a transplantation portion, and a first hair body portion, wherein the transplantation portion is embedded in the hair transplantation base, the first end fixing end portion and the first hair body portion are provided at two opposite sides of the hair transplantation base.

Claims

1. A hair weft, comprising: a hair transplantation base; and a first hair strand which comprises a plurality of first hair elements, wherein each of the plurality of first hair elements comprises a first end fixing end portion, a transplantation portion, and a first hair body portion, wherein the transplantation portion, which is extended between the first end fixing end portion and the first hair body portion, is embedded in the hair transplantation base, the first end fixing end portion and the first hair body portion are provided at two opposite sides of the hair transplantation base.

2. The hair weft, as recited in claim 1, wherein the hair transplantation base has a plurality of transplantation holes each is penetrated by one or more transplantation portions of the plurality of first hair elements.

3. The hair weft, as recited in claim 1, wherein the hair transplantation base has a plurality of transplantation holes each is penetrated by multiple transplantation portions of the plurality of first hair elements.

4. The hair weft, as recited in claim 3, wherein the hair transplantation base comprises a silk mesh and a glue layer applied to the silk mesh.

5. The hair weft, as recited in claim 1, wherein the transplantation portion is vertically penetrated through a thickness of the hair transplantation base.

6. The hair weft, as recited in claim 1, wherein the transplantation portion is inclinedly penetrated through a thickness of the hair transplantation base.

7. The hair weft, as recited in claim 6, wherein the transplantation portion slopes upward from a direction from the first hair body portion to the first end fixing end portion.

8. The hair weft, as recited in claim 6, wherein the transplantation portion slopes downward from a direction from the first hair body portion to the first end fixing end portion.

9. The hair weft, as recited in claim 6, wherein an transplantation angle defined between the transplantation portion and a width direction of the hair transplantation base is ranged from 30 to 60.

10. The hair weft, as recited in claim 1, wherein the hair transplantation base comprises a front surface and a rear surface, the first hair body portion is extended from the front surface of the hair transplantation base, the first end fixing end portion is attached to the rear surface of the hair transplantation base.

11. The hair weft, as recited in claim 10, further comprising a fixing glue, wherein the first hair body portion is extended downward from the front surface of the hair transplantation base, the first end fixing end portion is bent upward from the transplantation portion and adhered to the rear surface of the hair transplantation base.

12. The hair weft, as recited in claim 10, further comprising a fixing glue, wherein the first hair body portion is extended downward from the front surface of the hair transplantation base, the first end fixing end portion is bent downward from the transplantation portion and adhered to the rear surface of the hair transplantation base.

13. The hair weft, as recited in claim 10, further comprising a fixing glue, wherein the first hair body portion is extended downward from the front surface of the hair transplantation base, the first end fixing end portion is extended transversely and adhered to the rear surface of the hair transplantation base.

14. The hair weft, as recited in claim 1, wherein the hair transplantation base has a top edge, wherein a distance between a topmost first hair element of the plurality of first hair elements and the top edge of the hair transplantation base is 0-1 cm.

15. The hair weft, as recited in claim 12, wherein the hair transplantation base has a top edge, wherein a distance between a topmost first hair element of the plurality of first hair elements and the top edge of the hair transplantation base is smaller than 1 mm.

16. The hair weft, as recited in claim 15, wherein the distance between the topmost first hair element of the plurality of first hair elements and the top edge of the hair transplantation base is smaller than 0.5 mm.

17. The hair weft, as recited in claim 1, wherein each of the plurality of first hair elements comprises a connection position between the first hair body portion and the transplantation portion, wherein the connection position is positioned not lower than the transplantation portion and the first end fixing end portion.

18. The hair weft, as recited in claim 1, wherein the plurality of first hair element comprise an upper group of first hair elements and a lower group of first hair element, wherein from a direction from the first hair body portion to the first end fixing end portion, each transplantation portion of the upper group of first hair elements slopes downward while each transplantation portion of the lower group of first hair elements slopes upward.

19. The hair weft, as recited in claim 1, wherein the plurality of first hair element comprise an upper group of first hair elements and a lower group of first hair elements, wherein a hair density of the upper group of first hair elements is larger than a hair density of the lower group of first hair elements.

20. The hair weft, as recited in claim 1, wherein the plurality of first hair elements comprise an upper group of first hair elements and a lower group of first hair elements, wherein the hair transplantation base has a plurality of transplantation holes for implanting the plurality of first hair elements, wherein a number of the first hair elements of the upper group of first hair elements implanted in the corresponding transplantation hole is larger than a number of the first hair elements of the lower group of first hair elements implanted in the corresponding transplantation hole.

21. The hair weft, as recited in claim 1, wherein the plurality of first hair elements comprise an upper group of first hair elements and a lower group of first hair elements, wherein the hair transplantation base has a plurality of transplantation holes for implanting the plurality of first hair elements, wherein a density of the transplantation holes for implanting the first hair elements of the upper group of first hair elements is larger than a density of the transplantation holes for implanting the first hair elements of the lower group of first hair elements.

22. The hair weft, as recited in claim 1, further comprising an attaching base attached to the hair transplantation base and a second hair strand fixed to the attaching base, the first end fixing end portion is located between the hair transplantation base and the attaching base.

23. The hair weft, as recited in claim 21, wherein the second hair strand comprises a plurality of second hair elements each comprising a second end fixing portion and a second hair body portion which is integrally extended from the corresponding second end fixing portion, wherein the second end fixing portion of each second hair element is embedded in the attaching base, the second hair body portion is extended from a bottom edge of the attaching base.

24. The hair weft, as recited in claim 22, further comprising an attaching unit attached to the attaching base for allowing the hair weft to be worn on a user.

25. The hair weft, as recited in claim 24, wherein the attaching unit is one of a double-sided binding tape and a clipping member.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0092] In order to more clearly illustrate the technical solutions in the specific embodiments or related art of the present disclosure, the accompanying drawings to be used in the description of the specific embodiments or related art will be briefly introduced below. It will be obvious that the accompanying drawings in the following description are some of the embodiments of the present disclosure, and that for those skilled in the art, other attachments can be obtained based on these accompanying drawings without putting in creative labor.

[0093] FIG. 1 is a structural schematic view of a hair transplantation base of a hair weft according to some embodiments of the present disclosure.

[0094] FIG. 2 is a structural schematic view of a first hair weft and a second hair weft of a hair weft after being affixed according to some embodiments of the present disclosure.

[0095] FIG. 3 is a flowchart of a preparation process of a hair weft according to some embodiments of the present disclosure.

[0096] FIG. 4 is a perspective view of a hair weft according to a preferred embodiment of the present invention.

[0097] FIG. 5A is a perspective view illustrating a front side of a first hair weft unit of the hair weft according to the above preferred embodiment of the present invention.

[0098] FIG. 5B is an partial enlarged view of area A in FIG. 5A.

[0099] FIG. 6A is a perspective view illustrating a rear side of the first hair weft unit of the hair weft according to the above preferred embodiment of the present invention.

[0100] FIG. 6B is an partial enlarged view of area B in FIG. 5A.

[0101] FIG. 7A is a perspective view illustrating a rear side of the first hair weft unit of the hair weft according to the above preferred embodiment of the present invention.

[0102] FIG. 7B is an partial enlarged view of area C in FIG. 5A.

[0103] FIG. 8A is a perspective view illustrating a rear side of the hair weft according to the above preferred embodiment of the present invention, wherein a clipping element is in an open state.

[0104] FIG. 8B is an partial enlarged view of area D in FIG. 8A.

[0105] FIG. 9A is a perspective view illustrating the clipping element of the hair weft being in a closed state according to the above preferred embodiment of the present invention.

[0106] FIG. 9B is an partial enlarged view of area E in FIG. 9A.

[0107] FIG. 10 is a sectional view illustrating the hair weft according to the above preferred embodiment of the present invention.

[0108] FIG. 11 is a perspective view illustrating a second hair weft unit of the hair weft according to an alternative mode of the above preferred embodiment of the present invention.

[0109] FIG. 12 is a schematic view illustrating the hair weft according to an alternative mode of the above preferred embodiment of the present invention.

[0110] FIGS. 13A, 13B, 13C and 13D are schematic views illustrating the preparing of the first hair weft unit of the hair weft according to the above preferred embodiment of the present invention.

[0111] FIGS. 14A, 14B, 14C, 14D, 14E and 14F are schematic views illustrating the preparing of the second hair weft unit of the hair weft according to the above preferred embodiment of the present invention.

[0112] FIGS. 15A, 15B, 15C and 15D are schematic views illustrating the preparing of the hair weft by attaching the first hair weft unit to the second hair weft unit according to the above preferred embodiment of the present invention.

[0113] FIGS. 16A, 16B, 16C and 16D are schematic views illustrating the preparing of the hair weft by attaching the first hair weft unit to the second hair weft unit according to another alternative mode of the above preferred embodiment of the present invention.

[0114] FIG. 17 is a perspective view of a first hair weft unit according to a third embodiment of the present invention.

[0115] FIGS. 18A, 18B, 18C, 18D and 18E are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the above third embodiment of the present invention.

[0116] FIG. 19 is a partial enlarged view of area F of FIG. 18E.

[0117] FIG. 20 is a perspective view of a first hair weft unit according to a first alternative mode of the above third embodiment of the present invention.

[0118] FIGS. 21A, 21B, 21C, 21D and 21E are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the first alternative mode of the above third embodiment of the present invention.

[0119] FIG. 22 is a partial enlarged view of area G of FIG. 21E.

[0120] FIG. 23 is a perspective view of a first hair weft unit according to a second alternative mode of the above third embodiment of the present invention.

[0121] FIGS. 24A, 24B, 24C, 24D and 24E are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the second alternative mode of the above third embodiment of the present invention.

[0122] FIG. 24F is a partial enlarged view of area H of FIG. 24E.

[0123] FIG. 25 is a perspective view of a first hair weft unit according to a third alternative mode of the above third embodiment of the present invention.

[0124] FIGS. 26A, 26B, 26C, 26D, 26E and 26F are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the third alternative mode of the above third embodiment of the present invention.

[0125] FIG. 27 is a partial enlarged view of area I of FIG. 26E.

[0126] FIG. 28 is a perspective view of a first hair weft unit according to a fourth alternative mode of the above third embodiment of the present invention.

[0127] FIGS. 29A, 29B, 29C, 29D, 29E, 29F and 29G are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the fourth alternative mode of the above third embodiment of the present invention.

[0128] FIG. 29H is a partial enlarged view of area J of FIG. 29G.

[0129] FIG. 29I is a partial enlarged view of area K of FIG. 29G.

[0130] FIG. 30 is a perspective view of a first hair weft unit according to a fifth alternative mode of the above third embodiment of the present invention.

[0131] FIGS. 31A, 31B, 31C, 31D, 31E, 31F and 31G are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the fifth alternative mode of the above third embodiment of the present invention.

[0132] FIG. 32 is a perspective view of a first hair weft unit according to a sixth alternative mode of the above third embodiment of the present invention.

[0133] FIGS. 33A, 33B, 33C, 33D and 33E are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to the sixth alternative mode of the above third embodiment of the present invention.

[0134] FIGS. 34A, 34B, 34C, 34D, 34E, 34F, 34G, 34H and 34I are respectively sectional views illustrating the manufacturing process of the first hair weft unit according to a seventh alternative mode of the above third embodiment of the present invention.

[0135] FIG. 35 is a perspective view of a hair weft according to a fourth embodiment of the present invention.

[0136] FIG. 36 is another perspective view of the hair weft according to the above fourth embodiment of the present invention.

[0137] FIG. 37 is an exploded view of the hair weft according to the above fourth embodiment of the present invention.

[0138] FIGS. 38A, 38B, 38C, 38D and 38E are respectively sectional views illustrating the manufacturing process of the hair weft according to the above fourth embodiment of the present invention.

[0139] FIG. 39 is a perspective view illustrating a transplantation machine according to the above embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0140] The following will be a clear and complete description of the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, and not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present disclosure.

[0141] The present specification provides steps for operating the method as described in the embodiments or flowcharts, but more or fewer steps may be included based on routine or unoriginal labor. When executed in a real-world system or server product, the methods may be executed sequentially or in parallel (e.g., a parallel processor or multi-threaded processing environment) as shown in the embodiments or the accompanying drawings.

[0142] FIG. 1 is a structural schematic view of a hair transplantation base of a hair weft according to some embodiments of the present disclosure, and FIG. 2 is a structural schematic view of a first hair weft and a second hair weft of a hair weft after being affixed according to some embodiments of the present disclosure. The hair weft refers to skin weft, which can be directly braided onto the head. The embodiments of the present disclosure are intended to solve the problem that the hair wefts have obvious weft edge, which has a large thickness affecting the wearing comfort, and is not invisible enough causing obvious appearances; the hair wefts have folded hair, and the folded-back short hair will be in contact with the scalp when the wearer activities, resulting in a tingling sensation. Referring to FIGS. 1 and 2, the structure of the hair weft includes: [0143] a first hair weft, including a hair transplantation base 1 and a first hair strand 2; [0144] where the hair transplantation base 1 includes a mesh base 101 and a spacer 102 disposed above the mesh base 101; the spacer 102 is configured to clamp the first hair strand 2 after the first hair strand 2 passes through the mesh base 101 and the spacer 102; the mesh base 101 is configured to affix the first hair strand 2 to a side of the mesh base 101 after the spacer 102 and the mesh base 101 are separated; [0145] a second hair weft, including a second hair strand 3; where a top of the second hair strand 3 is fixed through quilting line and glue; [0146] where the second hair weft is cut and affixed flush to a bottom of the first hair weft to obtain the hair weft.

[0147] The present disclosure can solve the problem that existing hair wefts have folded hair and the folded-back short hair will be in contact with the scalp during the wearer activities, resulting in a tingling sensation, by affixing the second hair weft at the bottom of the first hair weft in a flush-fit manner. Moreover, by fixing the first hair strand 2 to one side of the mesh base 101, the mesh base has no obvious weft edge, which has a smaller thickness and is comfortable to wear. The second hair weft made by the second hair strand 3 is attached to the bottom of the first hair weft to make the finished hair weft, which has the effect of being invisible, such that the hair weft is not obvious after being worn. Because the first hair weft has a low density and volume of hair transplantation and cannot satisfy our demand for a large volume of hair, the second hair weft with a relatively large volume of hair is additionally made, and the first and second hair wefts are affixed together by means of an adhesive. To make the hair weft, the first and second hair wefts are placed vertically, and then the roots of the two hair wefts are affixed together by means of the adhesive.

[0148] In some embodiments, the material of the mesh base 101 is a non-stretchy, densely perforated, ultra-thin mesh silk yarn.

[0149] In the embodiments, the silk yarn may be Korean silk. The silk yarn is selected from the short fibers of silk by spinning and regeneration. Goods made from silk yarn or yarn woven in a plain arrangement are called silk. The texture of silk is tight and frivolous, with a fine and clean surface, lubricating and flat, glossy and soft, to be used as clothing material and decorative items. Korean silk is one of the series of silk fabrics produced by combining the characteristics of Korean silk products with Chinese weaving technology. The mesh base 101 made of Korean silk has no visible weft edges, which is less thick and is comfortable to wear.

[0150] In some embodiments, the material of the spacer 102 is PVC artificial leather.

[0151] The material of the spacer 102 in the embodiments is PVC artificial leather with a thickness of 0.4 mm. A curved hook carried at a top of a needle of a transplantation machine can pierce the spacer 102 and the mesh base 101 in turn when it moves up and down, and the curved hook at the top of the needle hooks the first hair strand 2 and brings the first hair strand 2 out of the pierced hole, and the spacer 102 shrinks after the needle has been withdrawn from the hole to clamp the first hair strand 2. The spacer 102 made of PVC artificial leather has better shrinkage and is cheap and easy to obtain.

[0152] FIG. 3 is a flowchart of a preparation process of a hair weft according to some embodiments of the present disclosure. Referring to FIG. 3, the embodiments of the present disclosure further provide a preparation process of a hair weft, including:

[0153] Step 1, preparing a hair transplantation base: the hair transplantation base includes a mesh base and a spacer, the mesh base and the spacer are cut to a predetermined shape, and the mesh base and the spacer are aligned and bound together after a hair transplantation area is marked on the spacer.

[0154] Specifically, the implementation steps of preparing the hair transplantation base include:

[0155] Step 101, cutting the mesh base and spacer to a desired shape and length.

[0156] Step 102, marking the desired hair transplantation area on the spacer with a marker.

[0157] Step 103, overlapping the mesh base and spacer, and binding and fixing the mesh base and the spacer with a stapler.

[0158] Step 2, preparing a first hair strand and placing the first hair strand in a predetermined area.

[0159] Specifically, the implementation steps of preparing a first hair strand and placing the first hair strand in the predetermined area include:

[0160] Step 201, organizing the first hair strand to a uniform height.

[0161] In step 201, a top of the first hair strand is tapped flush with a clapper board, and hair that is too short is lifted by hand to keep the overall height of the first hair strand consistent.

[0162] Step 202: fixing a middle part of the first hair strand.

[0163] In step 202, the middle part of the first hair strand is placed in two hair-beating splints with curved pins for fixing.

[0164] Step 203: placing the first hair strand in a transplantation area of a transplantation machine.

[0165] In step 203, the first hair strand is placed flat on top of the transplantation area of the transplantation machine.

[0166] Step 204: placing the mesh base and the spacer in turn above the transplantation area.

[0167] In step 204, the fabricated hair transplantation base is placed on top of the first hair strand, with the mesh base on the bottom and the spacer on the top.

[0168] Step 3, preparing a first hair weft: after passing the prepared first hair strand placed in the predetermined area through the spacer and the mesh base, cutting the first hair strand disposed between the spacer and the mesh base, fixing the first hair strand on a side of the mesh base, and cutting the first hair strand on the other side of the mesh base shorter, to obtain the first hair weft.

[0169] Specifically, the implementation steps of step 3 include:

[0170] Step 301, utilizing a curved hook at a top of a transplantation machine to sequentially hook the first hair strand located below the mesh base in the hair transplantation area, and utilizing the spacer to clamp the first hair strand until the first hair strand is completely transplanted in the hair transplantation area.

[0171] In step 301, a top of a needle of the transplantation machine is arranged with a curved hook, and the curved hook pierces the spacer 102 and the mesh base 101 in turn when the needle moves up and down; upon reaching the first hair strand, the curved hook on the top of the needle hooks some of the first hair strand, and brings some of the first hair strand out of the pierced hole, and the spacer shrinks after the machine needle is withdrawn from the hole, to clamp the some of the first hair strand. Step 301 is repeated until the first hair strand is completely transplanted in the hair transplantation area.

[0172] Step 302, cutting the first hair strand located between the spacer and the mesh base, affixing the first hair strand to the mesh base through an adhesive, and drying.

[0173] In step 302, the hair transplantation base after the hair transplantation is completed is removed from the first hair strand, and the hair strand between the mesh base and the spacer is cut through scissors to separate the mesh base from the spacer. An adhesive is applied to the first hair strand and dried in an oven. The first hair strand on the back of the mesh base is pressed down and ironed flat through an iron such that the first hair strand is parallel to the mesh base. The adhesive is applied again to the first hair strand on the back of the mesh base and dried in the oven.

[0174] Step 303: cutting the first hair strand on the side of the mesh base away from the spacer to 0.1 to 2 cm, to obtain the first hair weft.

[0175] In step 303, the first hair strand on the back of the mesh base is trimmed to 0.1 to 2 cm through electric push shears to obtain the first hair weft.

[0176] Step 4: preparing a second hair weft: a top of the second hair strand that is organized to a same height are fixed through two quilting lines and fixed with a glue.

[0177] Specifically, the implementation steps of step 4 include:

[0178] Step 401, tapping the top of the second hair strand flush with a clapper board, and hair that is too short is lifted by hand to keep the overall height of the second hair strand consistent.

[0179] Step 402, forming the two quilting lines on the top of the second hair strand through a double-needle sewing machine, to obtain a fixed preparatory hair weft.

[0180] Step 403, applying a masking tape 1.2 to 1.5 inches from a top of the preparatory hair weft to prevent the glue from penetrating into the second hair strand at a bottom during a subsequent brushing step, thereby achieving a shaping effect.

[0181] Step 404, mixing polyurethane glue, adhesive, and thinner in proportion to obtain a special glue for making the weft edge.

[0182] Step 405, applying the glue at a position above the masking tape, utilizing a scraper to repeatedly scrape the glue such that the glue contacts the second hair strand uniformly for fixing, and placing the second hair weft in an oven for drying.

[0183] Step 406, repeating step 405 three times to obtain the second hair weft.

[0184] Step 5, preparing the hair weft: cutting the first hair weft and the second hair weft, and affixing the second hair weft flush to a bottom of the first hair weft.

[0185] Specifically, the implementation steps of step 5 include:

[0186] Step 501, cutting the first hair weft and the second hair weft to production specifications.

[0187] Step 502, affixing the second hair weft flush to the bottom of the first hair weft to obtain the hair weft.

[0188] In step 502, the first hair weft and the second hair weft are placed vertically, and then the roots of the two hair wefts are affixed together by an adhesive.

[0189] Step 6, cleaning treatment: soaking the hair weft in an alkaline solution, and soaking the hair weft in a softener.

[0190] Specifically, the implementation steps of step 6 include:

[0191] Step 601, putting 100 g of the hair weft into 1 kg of 40 C. water, adding 2 g to 3 g of sodium hypochlorite solution, and soaking for 5 minutes.

[0192] Step 602: cleaning the hair weft for three times using 40 C. water.

[0193] Step 603: after the cleaning, putting the hair weft into 1 kg of 50 C. water, adding 30 g of softener, and soaking for 10 minutes.

[0194] Step 604: after the cleaning, putting the hair weft into 1 kg of 50 C. water, adding 40 g of softener, and soaking for 10 minutes.

[0195] The purpose of step 601 to step 604 is to make the product softer and smoother and eliminate static electricity.

[0196] After step 6, step 7 of drying treatment and packaging treatment is further implemented for easy storage.

[0197] Specifically, the implementation steps of step 7 include:

[0198] Step 701, after the soaking, putting the hair weft into a centrifuge for dewatering and shaking, combing the hair weft through a dense-toothed comb, scraping off floating hairs on the hair weft, putting the hair weft into the water to be slightly wetted, unfolding and flatly laying the hair weft onto an iron plate, scraping off excess water through a brush, and putting the hair weft into a drying room at 50 C. for drying.

[0199] Step 702, finishing and packaging: after drying, ironing, combing, and folding into wefts, bundling and packaging the hair weft.

[0200] The appearance of the hair weft prepared by this process is similar to the wearer's own hair, and there is no weft edge in the conventional sense of the traditional hair weft, which solves the problems of wearing discomfort caused by the weft edge being too thick and too hard, poor breathability, and irritation of the skin when wearing due to the issue of hair return, etc., and it is more invisible after wearing, which protects the privacy of the wearer more and enhances the wearing experience.

[0201] It is to be noted that the hair weft product made by the present disclosure can be worn by sewing/pasting clips to make a clip hair product, or it can be worn by pasting a double-sided adhesive on the second hair weft and cutting.

[0202] Referring to FIGS. 4 to 16D of the drawings, a hair weft according to a preferred embodiment of the present invention is illustrated, wherein the hair weft comprises a first hair weft unit 30 and a second hair weft unit 40 which is attached to the first hair weft unit 30 to increase a total hair volume of the hair weft.

[0203] More specifically, as shown in FIGS. 5A to 6B, the first hair weft unit 30 comprises a hair transplantation base 31 and a first hair strand 32 which is transplanted on the hair transplantation base 31. The first hair strand 32 comprises a plurality of first hair elements 321 each is fixed to the hair transplantation base 31. The material of the first hair elements 321 can be but not limited to real human hair, synthetic fiber, blended materials and animal hair. The first hair elements 321 made from real human hair can offer the most natural look and feel, and can be styled, dyed, and treated like natural hair. Artificial fibers, such as heat-resistant or low-temperature fibers, can be used for preparing the first hair elements 321 as then may not look as natural as human hair. The blended materials combine human hair with synthetic fibers to provide a balance between natural appearance and affordability. This mix aims to offer both the realistic look of human hair and the durability of synthetic fibers. The first hair element 321 also may be made from hair of animals like horses or yak, so as to offer a natural texture.

[0204] The hair transplantation base 31 comprises a silk mesh 311 and a glue layer 312 applied to the silk mesh 311, the glue material of the glue layer 312 is filled into the mesh holes of the silk mesh 311, so that the hair transplantation base 31 is an integral rigid and smooth layer which is suitable for the hair transplantation process.

[0205] The material of the silk mesh 311 can be natural silk, synthetic silk, mesh or netting. The natural silk is lightweight and provides a very natural appearance, making the hair look as if it's growing directly from the scalp. Synthetic silk can be used to reduce costs or increase durability. Nylon mesh is one of the most common materials used for netting. It's inexpensive and durable, lightweight, and breathable. Polyester mesh is also commonly used. It offers good durability and elasticity while maintaining high breathability. Alternatively, mesh caps incorporate a small amount of elastic fibers to increase elasticity and comfort, making the wig fit more snugly to the head.

[0206] In this embodiment, the silk mesh 311 can be made of Korean Silk which is a high-quality silk base material often made from synthetic silk or specially designed fibers that mimic the texture and appearance of natural silk. Korean silk is known for its fine, soft texture and natural look, providing a scalp-like appearance, making the hair look as if it is growing from the scalp. It also offers good breathability and is commonly used in high-end wigs.

[0207] The glue layer 312 may comprise one or more of acrylic resin, epoxy resin, polyurethane, plasticizers such as phthalates, fillers such as calcium carbonate, and solvents such as ethyl acetate, ethanol, acetone.

[0208] The first hair strand 32 comprises a first root portion 322 and a first hair strand body 323, the first root portion 322 of the first hair stand 32 is penetrated through the hair transplantation base 31 and is then fixed to a rear surface of the hair transplantation base 31 by a fixing glue, the rear surface of the hair transplantation base 31 is a binding surface 313 for adhering the first root portion 322 of the first hair strand 32. The first hair strand body 323 is extended at a front side of the hair transplantation base 31. Both of the first root portion 322 and the first hair strand body 323 are formed by the plurality of the first hair elements 321 which are aligned with each other in a strand.

[0209] The hair transplantation base 31 is correspondingly formed with a plurality of transplantation holes 314 when the first root portion 322 of the first hair stand 32 is passing through the glue layer 312 of the hair transplantation base 31. The first root portion 322 and the first strand body 323 are extended at two opposite sides of the hair transplantation base 31.

[0210] A top end of the first hair stand body 323 is planted on a front surface 315 of the hair transplantation base 31, and a top row of first hair elements 321 of the plurality of first hair elements 321 can be extended from a position on the front surface 315 adjacent to a top edge 316 of the hair transplantation base 31, as shown in FIG. 10, so that more first hair elements 321 are planted on the hair transplantation base 31.

[0211] Referring to FIGS. 7A and 7B, the second hair weft unit 40 comprises an attaching base 41 and a second hair strand 42 fixed to the attaching base 41. The attaching base 41 is adhered to the rear binding surface 313 of the hair transplantation base 31 by a binding glue, so as to fix and mount the second hair weft unit 40 to the first hair weft unit 30.

[0212] According to this embodiment, the attaching base 41 can be formed by a glue material, such as a mixture of polyurethane glue, adhesive, and thinner or diluent. The adhesive can be but not limited to isocyanates and polyester polyols. The thinner can be but not limited to ethyl acetate, xylene, acetone, and methyl ethyl ketone. Preferably, a weight content of polyurethane glue is ranged from 40%-60%, a weight content of adhesive is ranged from 10%-30%, and a weight content of thinner is ranged from 20%-40%.

[0213] The binding glue for attaching the attaching base 41 to the hair transplantation base 31 may contain one or more of epoxy resin, polyurethane, acrylic resin adhesive, phenolic resin adhesive, polyester resin adhesive, and neoprene adhesive.

[0214] Alternatively, as another alternative mode, with reference to FIG. 16B, the attaching base 41 may be attached to the hair transplantation base 31 by a double-sided tape 43. In other words, the attaching base 41 and the hair transplantation base 31 can be adhered to two opposite sides of the double-sided tape 43.

[0215] The second hair strand 42 comprises a plurality of second hair elements 421, and the material of the second hair elements 421 can be but not limited to real human hair, synthetic fiber, blended materials and animal hair. The second hair strand 42 also comprises a second root portion 422 and a second hair strand body 423 integrally extended from the second root portion 422, the plurality of second hair elements 421 are arranged in rows to form the second root portion 422 and the second hair strand body 423.

[0216] In this embodiment, the second root portion 422 of the second hair strand 42 is embedded in the attaching base 41. During the preparing process of the second hair weft unit 40, run two or more rows of stitching 424 along the second root portion 422 of the second hair strand 42 using a sewing machine to obtain a secured preparatory hair weft, and then the glue material of the mixture of polyurethane glue, adhesive, and thinner is applied to the second root portion 422 of the second hair strand 42, and dried to form the attaching base 41 which is embedded with the second root portion 422 of the plurality of second hair elements 421. In this embodiment, the attaching base 41 is shaped and sized to couple with the hair transplantation base 31, so as to form an integral base for supporting the first hair strand 32 and the second hair strand 42. As shown in FIG. 10 of the drawings, the first hair strand body 323 of the first hair strand 32 and the second hair strand body 423 of the second hair strand 42 are provided at two opposite sides of the hair transplantation base 31, so that the two hair weft units are combined to result in a final product that meets a high volume requirement. Gluing the hair transplantation base 31 between the two hair strands ensures a strong bond and seamless integration of the two hair weft units, creating a cohesive and natural-looking final product.

[0217] More specifically, the first hair strand body 323 of the first hair strand 32 is extended from the front surface 315 of the hair transplantation base 31, and a top end of the second hair strand body 423 of the second hair strand 42 is extended from a bottom edge 411 of the attaching base 411 and is preferred to be extending from a position corresponding to a bottom edge 317 of the hair transplantation base 31.

[0218] According to this embodiment, a top row of the first hair elements 321 of the first hair strand body 323 is extended from the top edge 316 of the hair transplantation base 31 and is naturally draping over the hair transplantation base 31 in a curved manner, the second hair strand body 423 is straightly extended from the bottom edge of the hair transplantation base 31, the starting points of their extensions are different, with the more curled first hair strand body 323 overlaying the second hair strand 42, a sense of depth and layering is created, so as to enhance the overall realism of the transplanted hair and improve texture, making the transplanted hair look more voluminous and lifelike. In other words, the two hair strand bodies provide varying textures and layers, this visual depth and texture is liking the natural growth patterns of hair, making the hairpiece look more authentic and appealing.

[0219] In addition, the first hair strand 32 has a lower density while the second hair strand 42 can be configured to have a higher density. In other words, in a same designated area corresponding to an area in the hair transplantation base 31, the number of the first hair elements 321 is smaller than the number of the second hair elements 421, so that the varying densities of the two hair strands contribute to a more pronounced layered effect, further mimicking natural hair growth.

[0220] Referring to FIGS. 11 and 12 of the drawings, according to an alternative mode, the second hair weft unit 40 comprises an attaching base 41 and a second hair strand 42 fixed to the attaching base 41. The attaching base 41 in this embodiment is an adhering tape, and a second root portion 422 of the second hair strand 42 is adhered to an adhering surface 412 of the adhering tape, and the adhering tape is adhered to the rear binding surface 313 of the hair transplantation base 31 by a binding glue, so as to fix and mount the second hair weft unit 40 to the first hair weft unit 30.

[0221] The adhering tape can be a double-sided tape, so that the other side of the adhering tape which is not attached with the second hair strand 42 can be used for being adhered to the hair of the user, so as to wear the hair weft of the present invention on the user.

[0222] Referring to FIGS. 8A to 9B of the drawings, the hair weft further comprises an attaching unit 50 which is coupled to a rear side of the attaching base 41 of the second hair weft unit 40 for coupling the hair weft to the hair of the user. Accordingly, the attaching base 41 has a front surface 413 that is adhered to the hair transplantation base 31, and a rear surface 414 for mounting the attaching unit 50.

[0223] In this embodiment, the attaching unit 50 comprises a clipping element 51 which is used for clipping the hair weft on the hair of the user. The clipping element 51 comprises a fixing base 511 and a clipping member 512 movably coupled to the fixing base 511, so as to define a clipping groove 513 for clipping the hair of the user.

[0224] The fixing base 511 has a plurality of fixing holes 5111, the clipping element 51 further comprises a plurality of connecting strings 514 which are penetrating through the hair transplantation base 31 and the attaching base 41, as well as the corresponding fixing holes 5111 for connecting the fixing base 511 to the first hair weft unit 30 and the second hair weft unit 40.

[0225] As shown in FIGS. 8B and 9B of the drawings, the fixing base 511 has two sets of fixing holes 5111 at two end portions thereof, and the clipping element 51 comprises two connecting strings 514 mounted to each of the two sets of fixing holes 5111 respectively.

[0226] The fixing base 511 is made of a resilient material, and in a closed state, the clipping member 512 is attached to the fixing base 511. When in a use state, the two end portions of the fixing base 511 can be pressed to deform the fixing base 511, so that the clipping member 512 is spaced apart from the fixing base 511 to define the clipping groove 513.

[0227] When the hair weft of the present invention is worn on the head of the user, the attaching unit 50 is attached to the head of the user, the second weft unit 40 is provided under the first weft unit 30 and is more close to the scalp, so that by replicating the natural decrease in hair density from the scalp outwards, the hair weft of the present invention achieves a more authentic and lifelike look. The higher density of the second hair strand 42 positioned nearer the scalp creates a fuller and more secure attachment, potentially improving comfort and preventing slippage.

[0228] Referring to FIGS. 16A to 16D of the drawings, as an alternative mode, the hair weft further comprises an attaching unit 50 which is coupled to a rear side of the attaching base 41 of the second hair weft unit 40 for coupling the hair weft to the hair of the user. In this embodiment, the attaching unit 50 comprises a double-sided binding tape 52, one side of the double-sided binding tape 52 is attached to the rear surface 414 of the attaching base 41, the other side of the double-sided binding tape 52 is used for adhering the hair of the user during usage.

[0229] The person of ordinary skilled in the art should understand that in alternative modes, the hair weft may comprise two first hair weft units 30, the hair transplantation bases 31 of the two first hair weft units 30 are attached with each other, so as to form two layers of hair strands. The attaching unit 50 which may be the double-sided binding tape 52 can be attached to one of the first hair weft units 30 for mounting the hair weft to the hair of the user.

[0230] In another alternative mode, the hair weft may comprise the first hair weft unit 30 and the second hair weft unit 40, and the second hair weft unit 40 can be mounted to the front surface 315 of the first hair weft unit 30, and an upper portion of the first hair strand body 322 is sandwiched between the hair transplantation base 31 of the first hair weft unit 30 and the attaching base 41 of the second hair weft unit 40.

[0231] Referring to FIGS. 13A to 15D of the drawings, a preparing method of the hair weft according to the preferred embodiment of the present invention is illustrated, the preparing method comprises a process of preparing the first hair weft unit 30, a process of preparing the second hair weft unit 40, a process of attaching the second hair weft unit 40 to the first hair weft unit 30, a process of cleaning the hair weft unit, and a process of mounting the attaching unit 50 to the second hair weft unit 40.

[0232] The process of preparing the first hair weft unit 30 comprises a step of mounting a support piece 60 with the hair transplantation base 31, and a step of transplanting the first hair strand 32 on the hair transplantation base 31.

[0233] More specifically, referring to FIGS. 13A to 13D, the support piece 60 with a marked transplantation area is aligned with the hair transplantation base 31, the support piece 60 is shaped and sized to couple with the hair transplantation base 31 and then is fixed with the hair transplantation base 31. For example, a stapler can be used to fix the support piece 60 with the hair transplantation base 31. The hair transplantation base 31 is prepared by applying the glue layer 312 on the silk mesh 311.

[0234] When transplanting the first hair strand 32 on the hair transplantation base 31, a middle part of the material of the first hair strand 32 is fixed by two clamping plates each is provided with a curved pin, and then the material of the first hair strand 32 is placed in a transplantation area of a transplantation machine, the combination of the support piece 60 and the hair transplantation base 31 is placed on the first hair strand 32 in a manner that the hair transplantation base 31 is sandwiched between the support piece 60 and the hair transplantation base 31.

[0235] The transplantation machine is then in operation to drive needle hooks to guide the material of the first hair strand 32 to pass through the hair transplantation base 31 and the support piece 60. And then the portion of the material of the first hair strand 32 disposed between the support piece 60 and the hair transplantation base 31 is cut to leave a first root portion 322 of the first hair strand 32 on the rear binding surface 313 of the hair transplantation base 31. The support piece 60 is thus separated from the hair transplantation base 31. The length of the first root portion 322 is preferred to be ranged from 0.1 cm-2 cm. Finally, a fixing glue is applied to the first root portion 322 of the first hair strand 32 to the rear binding surface 313 of the hair transplantation base 31.

[0236] The support piece 60 can be a natural leather layer or a PVC artificial leather layer. In this embodiment, the support piece 60 is made of PVC artificial leather and has a thickness of 0.4 mm. After the needle hooks of the transplantation machine pierce the support piece 60 and the glue layer 312 of the hair transplantation base 31 in turn when the needle hooks move up and down, the material of the first hair elements 321 of the first hair strand 32 is guided to be out of the pierced transplantation holes 314, and the resilient support piece 60 shrinks after the needle has been withdrawn from the transplantation holes 314, so as to clamp and retain the first hair strand 32 in position.

[0237] Referring to FIGS. 14A to 14F, the process of preparing the second hair weft unit 40 comprises the steps of stitching a top of the second hair strand 42 to obtain a fixed preparatory hair weft unit, applying a masking tape 70 which is 1.2 inches to 1.5 inches from a top of the preparatory hair weft unit to define the second root portion 422 of the second hair strand 42, and applying a glue material on the second root portion 422 of the second hair strand 42 to form the attaching base 41 which is embedded with the second root portion 422 of the second hair strand 42.

[0238] Accordingly, the stitching 424 of the two quilting lines is formed on the second root portion 422 of the second hair strand 42 through a double-needle sewing machine. In this embodiment, the second hair weft unit 40 comprises a first stitching line 4241 and a second stitching line 4242, the two intersecting stitching lines 4241 and 4242 are arranged in an 8 pattern. The first stitching line 4241 is made of a water-soluble thread, and the second stitching line 4242 is a cotton thread. When exposed to the liquid glue material, the water-soluble thread of the first stitching line 4241 dissolves, causing the cotton thread of the second stitching line 4242 to detach. The purpose of these two stitching liens 4241 and 4242 is to keep the material of the second hair strand 42 of the second hair weft unit 40 flat and stable when placed on a glass surface for applying the glue material, preventing it from shifting or moving around.

[0239] The masking tape 70 is arranged to define the second root portion 422 and the second hair strand body 423 of the second hair strand 42 by preventing the glue material applied on the second root portion 422 to flow towards the second hair strand body 423 of the second hair strand 42.

[0240] The glue material can be a mixture of polyurethane glue, adhesive, and thinner or diluent. The adhesive can be but not limited to isocyanates and polyester polyols. The thinner can be but not limited to ethyl acetate, xylene, acetone, and methyl ethyl ketone. The preparation of the glue material comprises a step of mixing polyurethane glue, adhesive, and thinner, wherein a weight content of polyurethane glue is ranged from 40%-60%, a weight content of adhesive is ranged from 10%-30%, and a weight content of thinner is ranged from 20%-40%.

[0241] Referring to FIGS. 15A to 15D, in the process of attaching the second hair weft unit 40 to the first hair weft unit 30, the binding glue is applied between the attaching base 41 and the hair transplantation base 31, so as to for the hair weft comprising the first hair weft unit 30 and the second hair weft unit 40. The binding glue is made of one or more of epoxy resin, polyurethane, acrylic resin adhesive, phenolic resin adhesive, polyester resin adhesive, and neoprene adhesive.

[0242] Alternatively, the attaching base 41 and the hair transplantation base 31 are respectively adhered to two opposite sides of a double-sided tape, so as to assembly the first weft unit 30 with the second weft unit 401.

[0243] In the process of cleaning the hair weft unit comprising the first weft unit 30 and the second weft unit 40, 100 g of the hair weft is added into 1 kg of 40 C. water, 2 g to 3 g of sodium hypochlorite solution is added into the water, and soak for 5 minutes; and then clean the hair weft for three times using 40 C. water.; after the cleaning, the hair weft is put into 1 kg of 50 C. water, 30 g of softener is added, and soak for 10 minutes; after the previously cleaning step, the hair weft is put into 1 kg of 50 C. water, 40 g of softener is added, and soak for 10 minutes, so as to make the product softer and smoother and eliminate static electricity.

[0244] After the above cleaning step with the water, a drying treatment is further implemented for easy storage. More specifically, after the soaking, the hair weft is put into a centrifuge for dewatering and shaking, the hair weft is combined through a dense-toothed comb to scrape off floating hairs on the hair weft, the hair weft is then put into the water to be slightly wetted, unfold and flatly lay the hair weft onto an iron plate, scrape off excess water through a brush, and then the hair weft is put into a drying room at 50 C. for drying.

[0245] In the process of mounting the attaching unit 50, the attaching unit 50 which can be embodied as a clipping element 51 is attached to the rear surface 414 of the attaching base 41 of the second weft unit 40 by the connecting strings 514 which are respectively penetrating through the attaching base 41 and the hair transplantation base 31.

[0246] As an alternative mode, a double-sided binding tape 5 is used as the attaching unit 50, one side of the double-sided binding tape 52 is attached to the rear surface 414 of the attaching base 41, the other side of the double-sided binding tape 52 is used for adhering the hair of the user during usage.

[0247] As shown in FIG. 17 of the drawings, a hair weft according to a third embodiment of the present invention is illustrated, the hair weft comprises a first hair weft unit 30 which comprises a hair transplantation base 31 and a first hair strand 32 which is transplanted on the hair transplantation base 31, and an attaching unit 50 for adhering the hair weft to the user. The first hair strand 32 comprises a plurality of first hair elements 321 each is fixed to the hair transplantation base 31. Similar as the above embodiment, the material of the first hair elements 321 can be but not limited to real human hair, synthetic fiber, blended materials and animal hair.

[0248] The hair transplantation base 31 comprises a silk mesh 311 and a glue layer 312 applied to the silk mesh 311, the glue material of the glue layer 312 is filled into the mesh holes of the silk mesh 311, so that the hair transplantation base 31 is an integral rigid and smooth layer which is suitable for the hair transplantation process. Alternatively, the hair transplantation base 31 comprises a fabric layer or a textile layer and a glue layer applied to the fabric layer or the textile layer. The hair transplantation base 31 may also be made of plastic material such as polyvinyl chloride and polyurethane.

[0249] Each first hair element 321 of the first hair strand 32 comprises a first end fixing portion 3211, a transplantation portion 3212 which is embedded in the hair transplantation base 31, and a first hair body portion 3213, the first end fixing portion 3211 of each first hair element 321 is penetrated through the hair transplantation base 31 and is then fixed to a rear surface 318 of the hair transplantation base 31 by a fixing glue 33, the rear surface 318 of the hair transplantation base 31 is an attaching surface for adhering the first end fixing portion 3211 of each first hair element 321. The first hair body portion 3213 of each first hair element 321 is extended at a front side of the hair transplantation base 31.

[0250] The hair transplantation base 31 is correspondingly formed with a plurality of transplantation holes 314 when the transplantation portion 3212 of each first hair element 321 is embedded into the hair transplantation base 31 during the transplantation process. The first end fixing portion 3211 and the first hair body portion 3213 are respectively extended at two opposite sides of the hair transplantation base 31.

[0251] A top end of each first hair body portion 3213 of a top row of the first hair elements 321 of the plurality of first hair elements 321 can be extended from a position on the front surface 315 adjacent to a top edge 316 of the hair transplantation base 31.

[0252] As shown in FIGS. 18A to 19 of the drawings, the transplantation portion 3212, which is a portion between the first end fixing portion 3211 and the first hair strand body 3213, can be vertically planted in the hair transplantation base 31. The first end fixing portion 3211 is bent downward and then is fixed to the rear surface 318 of the hair transplantation base 31 by the fixing glue 33. In other words, a glue applying brush carrying the fixing glue 33 can be moved downward to apply the fixing glue 33 on the rear surface 318 of the hair transplantation base 31 and simultaneously drive the first end fixing portion 3211 to bend downward and attach to the rear surface 318 of the hair transplantation base 31.

[0253] The first hair body portion 3213 is extended downward from the hair transplantation base 31, following the natural drooping direction of human hair under the influence of gravity and imitating the natural flow and drooping behavior of real hair after the first hair weft unit 30 emerges from the scalp. The first end fixing portion 3211 is also extended downward. This downward folding of the first end fixing portion 3211 and the first hair body portion 3213 creates a bending point at the connection between the first hair body portion 3213 and the transplantation base 31, forming a natural curve at the root area thereof. This curved configuration generates a fluffy and voluminous appearance at the root of the hair, imitating the natural lift and flow of human hair.

[0254] Furthermore, because the first end fixing portion 3211 is bent and secured downward behind the hair transplantation base 31, during manufacturing, the first hair weft unit 30 can be cut precisely along the connecting area where the topmost first hair body portion 3213 meets the top surface of the hair transplantation base 31.

[0255] This cutting operation significantly reduces a distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31, the distance can be smaller than 1 mm, preferred 0.3 mm-0.5 mm, thus minimizing any blank or hairless border at the upper edge of the hairpiece and providing a more natural and continuous hairline when the first hair weft unit 30 is applied to the head of the user.

[0256] As shown in FIGS. 18A to 18E of the drawings, the manufacturing of the first hair weft unit 30 is similar to the above embodiment in which a resilient support piece 60 is employed to temporarily fix the first hair element, and after the first hair elements are implanted on the hair transplantation base 31 and the support piece 60, the support piece 60 is removed cutting the portions of the first hair elements 321 between the hair transplantation base 31 and the support piece 60, and then the first end fixing portion 3211 is fixed to the rear surface 318 of the hair transplantation base 31 by the fixing glue 33. The first hair weft unit 30 is prepared from a material piece 300, and as shown in FIG. 18D, an edge part 3001 with a portion of the fixing glue 33 is cut off from the material piece 300 for manufacturing the first hair weft unit. After the edge part 3001 is removed, an upper edge portion is defined between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31, the distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31 is the height of the upper edge portion which is less than 1 mm.

[0257] The person of ordinary skilled in the art should understand that the first end fixing portion 3211 can be vertically bent downward, inclinedly bent downward on the rear surface 318 of the hair transplantation base 31, or horizontally extended on the rear surface 318 of the hair transplantation base 31.

[0258] As shown in FIG. 39 of the drawings, one or more needles 81 of a transplantation machine 80 is used to guide the first hair elements 321 to pass through the hair transplantation base 31 and the above mentioned support piece 60 during the transplantation process, to form the plurality of transplantation holes 314 in the hair transplantation base 31. In this embodiment, one or more transplantation portions 3212 can be guided to pass through the same transplantation hole 314. Preferably, in this embodiment, multiple transplantation portions 3212 are implanted in the same transplantation hole 314. For example, four transplantation portions 3212 are implanted in the same transplantation hole 314, so that each transplantation hole 314 can be used to implant four first hair elements 321. Alternatively, the first hair elements can be manually stitched on the hair transplantation base 31.

[0259] By allowing multiple hair elements 321 to share a single transplantation hole 314, the final hairpiece achieves a fuller, denser appearance without creating an excessive number of transplantation holes that could damage the structural integrity of the hair transplantation base 31. Since the number of transplantation holes 314 is minimized despite the high number of hair elements 321 implanted, the mechanical strength and tear resistance of the hair transplantation base 31 are better preserved. Using fewer transplantation holes while implanting multiple hair elements 321 at once also reduces the complexity and time needed for the manufacturing process.

[0260] Naturally growing human hair often emerges in small groups from a single follicle (known as follicular units, typically containing 2-5 hairs). Planting multiple first hair elements 321 into the same transplantation hole 314 realistically simulates this natural grouping behavior, producing a more authentic hair distribution pattern.

[0261] As shown in FIGS. 20 to 24F of the drawings, as a first alternative mode and a second alternative mode of the above third embodiment, the transplantation portion 3212 is inclindedly embedded in the hair transplantation base 31, so as to allow the first hair body portion 3213 to be inclinedly planted in the hair transplantation base 31 and extended downward from the hair transplantation base 31 at the front side of the hair transplantation base 31. This strategic inclination allows the first hair body portion 3213 which is the visible hair part to protrude from the front side of the hair transplantation base 31 at a natural angle when the first hair weft unit 30 is worn on the head of the user. The needle 81 of the transplantation machine 80 can be embodied to comprise an inclined or curved tip portion to allow the formation of the inclined transplantation holes 314. Alternatively, the transplantation portion 3212 may be curvedly embedded in the hair transplantation base 31.

[0262] In natural hair growth, hair strands exit the scalp at various angles depending on the location, such as crown and temples. By inclining the transplantation portion 3212 and the first hair body portion 3213 with respect to the hair transplantation base 31, the first hair weft unit 30 mimics the natural growth pattern of human hair, creating a more authentic, seamless, and undetectable visual effect compared to vertically implanted hair, which can appear stiff or unnatural.

[0263] Inclined implantation gives the hair strand a natural fall and flexibility, allowing it to move more fluidly with user movements. The user can style the hair more freely, such as parting it to different sides or combing it back, without revealing unnatural gaps or rigid roots. The inclined implantation replicates the soft draping behavior of natural hair, improving the tactile and aesthetic quality of the hairpiece.

[0264] An transplantation angle , which can be defined as an acute angle of the transplantation portion 3212 and a width direction W of the hair transplantation base 31, i.e, the vertical direction shown in FIG. 22 and FIG. 24F of the drawings, is less than 90, preferred to be 30-60, more preferred 30-45. In this embodiment, from a direction from the first hair body portion 3213 to the first end fixing portion 3211, i.e. from a direction from the front surface 315 of the hair transplantation base 31 to the rear surface 318 of the hair transplantation base 31, the transplantation portion 3212 slopes upward to define the transplantation angle between the transplantation portion 3212 and the width direction W of the hair transplantation base 31.

[0265] As shown in FIG. 24A to 24F of the drawings, the first hair body portion 3213 is extended downward from the hair transplantation base 31, following the natural drooping direction of human hair under the influence of gravity to imitate the natural flow and drooping behavior of real hair after the first hair weft unit 30 emerges from the scalp. The first end fixing portion 3211 can be extended upward, a distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31 should be larger than 1 mm, so as to prevent the topmost first hair body portion 3213 to fall off from the hair transplantation base 31 when the corresponding first end fixing portion 3211 is cut during the process of trimming the first hair weft unit 30 from a material piece 300 in the manufacturing process of the first hair weft unit 30 in which an edge part 3001 can be cut off from the material piece 300. The person of ordinary skilled in that art should understand that the upward extending first end fixing portion 3211 can be applied in other embodiments of the present invention.

[0266] As shown in FIG. 21A to FIG. 23 of the drawings, in this alternative mode, the first end fixing portion 3211 can be extended downward, a distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31 is thus can be reduced to be less than 1 mm.

[0267] As shown in FIGS. 25 to 27 of the drawings, as a third alternative mode, an transplantation angle , which can be defined as an acute angle of the transplantation portion 3212 and the width direction W of the hair transplantation base 31, is preferred to be 30-60, more preferred 30-45. In this embodiment, from a direction from the first hair body portion 3213 to the first end fixing portion 3211, the transplantation portion 3212 slopes downward to define the transplantation angle between the transplantation portion 3212 and the width direction W of the hair transplantation base 31. The first end fixing portion 3211 can be extended downward to reduce the distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31.

[0268] In this embodiment, the first hair body portion 3213 at the front side of the hair transplantation base 31 is bent downward, for example, by using a perming device to apply downward curling, so as to enhance the fluffy effect of the first hair weft unit 30. The intentional downward bending of both the first hair body portion 3213 and the first end fixing portion 3211 results in a fluffy texture that mimics natural hair volume, especially important in applications targeting thinning or balding area. Since the curved bending point of each hair strand is brought closer to the top edge 316, the first hair body portions 3213 can start almost immediately from the top, eliminating visible blank edges. This allows the hairpiece to be worn at or near the natural hairline without detectable borders, improving concealment and integration with the real hair of the user.

[0269] A shown in FIG. 27, a connection position 3214 between the first hair body portion 3213 and the transplantation portion 3212 is located on the front surface 315 of the hair transplantation base 31 and is at a position not lower than the transplantation portion 3212 and the first end fixing portion 3211, so that the transplantation portion 3212 and the first end fixing portion 3211 can be extended downward, and thus the distance D between the connection position 3214 of the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31 can be reduced. In this embodiment, the connection position 3214 between the first hair body portion 3213 and the transplantation portion 3212 is located above the transplantation portion 3212 and the first end fixing portion 3211. In the embodiment shown in FIGS. 17 to 19, the connection position 3214 between the first hair body portion 3213 and the transplantation portion 3212 is located equal to the position of the transplantation portion 3212 and is located above the first end fixing portion 3211.

[0270] As shown in FIGS. 28 to 29I of the drawings, as a fourth alternative mode, the plurality of first hair elements 321 are divided into an upper group of first hair elements 321a and a lower group of first hair elements 321b. From a direction from the first hair body portion 3213 to the first end fixing portion 3211, the transplantation portions 3212 of the upper group of first hair elements 321a slopes downward to define a first transplantation angle 1 between the transplantation portion 3212 and the width direction W of the hair transplantation base 31; the transplantation portions 3212 of the lower group of first hair elements 321b slopes upward to define a second transplantation angle 2 between the transplantation portion 3212 and the width direction W of the hair transplantation base 31. Both of the first transplantation angle 1 and the second transplantation angle 2 can be preferred to be 30-60, more preferred 30-45. Alternatively, the transplantation portions 3212 of one group of the upper group of first hair elements 321a and the lower group of first hair elements 321b can be vertically implanted into the hair transplantation base 31.

[0271] The first hair body portions 3213 of the upper group of first hair elements 321a are bent downward and stacked on the first hair body portions 3213 of the lower group of first hair elements 321b. The stacking structure provides a multi-layered, naturally cascading appearance for the overall hair weft, allowing it to simulate the overlapping, textured flow of natural human hair

[0272] By dividing the first hair elements 321 into upper and lower groups with distinct transplantation angles, the resulting hair weft replicates the way natural hair grows in layers with varying depths and orientations. The upper hair elements drape over the lower elements, creating a smooth blend and soft silhouette. The stacked configuration increases surface coverage per unit area, giving the hairpiece a denser and fuller appearance without increasing the number of transplantation holes 314.

[0273] The person of ordinary skilled in the art should understand that a hair density of the lower group of first hair elements 321b can be the same as, smaller than or larger than a hair density of the upper group of first hair elements 321a. For example, a number of the first hair elements 321 in the corresponding transplantation holes 314 for the lower group of first hair elements 321b can be the same as, smaller than or larger than a number of the first hair elements 321 in the corresponding transplantation holes 314 for the upper group of first hair elements 321a. Alternatively, a number of the transplantation holes 314 for the lower group of first hair elements 321b can be the same as, smaller than or larger than a number of the transplantation holes 314 for the upper group of first hair elements 321a. As shown in FIGS. 28 to 29I, the hair density of the lower group of first hair elements 321b and the hair density of the upper group of first hair elements 321a can be the same.

[0274] Preferably, as shown in FIGS. 30 to 31G, as the fifth alternative mode, the number of the first hair elements 321 in the corresponding transplantation holes 314 for the lower group of first hair elements 321b can be smaller than the number of the first hair elements 321 in the corresponding transplantation holes 314 for the upper group of first hair elements 321a. As an example, the number of the first hair elements 321 in the corresponding transplantation holes 314 for the lower group of first hair elements 321b is two while the number of the first hair elements 321 in the corresponding transplantation holes 314 for the upper group of first hair elements 321a is four, so that the hair density of the upper group of first hair elements 321a is larger than the hair density of the lower group of first hair elements 321b. This can be achieved by changing the diameters of the needles 81 of the transplantation machine 80 corresponding to the upper group of first hair elements 321a and the lower group of first hair elements 321b. A thinner lower layer with fewer hair elements helps minimize bulk and stiffness underneath the upper layer. This avoids unnatural lifting or bulging of the upper group 321a, ensuring that the upper hair elements drape smoothly and naturally over the lower elements. The hair density difference between the lower group of first hair elements 321b and the upper group of first hair elements 321a can be applied in other embodiments of the present invention.

[0275] In addition, in this embodiment, the first end fixing portion 3211 of the upper group of first hair elements 321 can be extended downward to reduce the distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31.

[0276] Alternatively, the plurality of first hair elements 321 are divided into a lower group of first hair elements 321b and an upper group of first hair elements 321a. From a direction from the first hair body portion 3213 to the first end fixing portion 3211, the transplantation portions 3212 of the lower group of first hair elements 321b slopes downward while the transplantation portions 3212 of the upper group of first hair elements 321a slopes upward.

[0277] As shown in FIGS. 32 to 33E of the drawings, as a sixth alternative mode, a density of the transplantation holes 314 for the lower group of first hair elements 321b can be smaller than a density of the transplantation holes 314 for the upper group of first hair elements 321a. For example, a number of the transplantation holes 314 for the lower group of first hair elements 321b is smaller than a number of the transplantation holes 314 for the upper group of first hair elements 321a, so that the hair density of the lower group of first hair elements 321a is smaller than the hair density of the upper group of first hair elements 321a.

[0278] A distance of two adjacent transplantation holes 314 for the lower group of first hair elements 321b along the width direction or length direction of the hair transplantation base 31 is smaller than a distance of two adjacent transplantation holes 314 for the upper group of first hair elements 321a. As shown in the FIGS. 32 to 33E, the lower group of first hair elements 321b comprises two rows of the first hair elements 321 while the upper group of first hair elements 321a comprises four rows of the first hair elements 321.

[0279] As shown in FIG. 34A to 34I of the drawings, as a seventh alternative mode, the plurality of the first hair elements 321 can be implanted on the hair transplantation base 31 along a length direction of the hair transplantation base 31, as shown in FIGS. 34A to 34H, and then the first hair body portions of the first hair elements 321 are applied with downward curling, as shown in FIG. 34I so as to allow the first hair body portions of the first hair elements 321 to be bent downward along the width direction of the hair transplantation base 31. In this embodiment, in the product of the first hair weft unit 30, the first end fixing portions of the first hair elements 321 can be extended transversely on the rear surface 318 of the hair transplantation base 31. As shown in FIG. 34E and FIG. 34I of the drawings, the first end fixing portions of the first hair elements 321 are extended horizontally along the length direction of the hair transplantation base 31, the first hair body portions of the first hair elements 321 are curled down along the width direction of the hair transplantation base 31.

[0280] As shown in FIGS. 35 to 38E of the drawings, a hair weft according to a fourth embodiment of the present invention is illustrated. The hair weft comprises a first hair weft unit 30, a second hair weft unit 40 which is attached to the first hair weft unit 30 to increase a total hair volume of the hair weft, and an attaching unit 50 attached to the second hair weft unit 40 for allowing the hair weft to be worn on the head of the user.

[0281] The first hair weft unit 30 comprises a hair transplantation base 31 and a first hair strand 32 which is transplanted on the hair transplantation base 31. The first hair strand 32 comprises a plurality of first hair elements each comprising a first end fixing portion 3211, a transplantation portion 3212 which is embedded in the hair transplantation base 31, and a first hair body portion 3213, the first end fixing portion 3211 of each first hair element 321 is penetrated through the hair transplantation base 31 and is then fixed to a rear surface 318 of the hair transplantation base 31 by a fixing glue 33, the rear surface 318 of the hair transplantation base 31 is an attaching surface for adhering the first end fixing portion 3211 of each first hair element 321. The first hair body portion 3213 of each first hair element 321 is extended at a front side of the hair transplantation base 31.

[0282] With also reference to FIGS. 20 to 22, the hair transplantation base 31 is correspondingly formed with a plurality of transplantation holes 314 when the transplantation portion 3212 of each first hair element 321 is embedded into the hair transplantation base 31 during the transplantation process. The first end fixing portion 3211 and the first hair body portion 3213 are respectively extended at two opposite sides of the hair transplantation base 31. The transplantation portion 3212 is inclinedly embedded in the hair transplantation base 31, so as to allow the first hair body portion 3213 to be inclinedly planted in the hair transplantation base 31 and extended downward from the hair transplantation base 31 at the front side of the hair transplantation base 31.

[0283] The transplantation angle , which can be defined as an acute angle of the transplantation portion 3212 and a width direction W of the hair transplantation base 31 can be preferred to be 30-60, more preferred 30-45. In this embodiment, from a direction from the first hair body portion 3213 to the first end fixing portion 3211, the transplantation portion 3212 slopes upward to define the transplantation angle between the transplantation portion 3212 and the width direction W of the hair transplantation base 31.

[0284] The first hair body portion 3213 is extended downward from the hair transplantation base 31, following the natural drooping direction of human hair under the influence of gravity and imitating the natural flow and drooping behavior of real hair after the first hair weft unit 30 emerges from the scalp. The first end fixing portion 3211 can be extended upward, a distance D between the topmost first hair body portion 3213 and the top edge 316 of the hair transplantation base 31 may be larger than 1 mm.

[0285] In this embodiment, the first hair weft unit 30 is embodied to have a structure shown in FIGS. 20 to 22 of the drawings. Alternatively, the first weft unit 30 can be embodied to have a structure shown in one of the embodiments shown in FIGS. 17-19 and 23 to 34I of the drawings.

[0286] The second hair weft unit 40 comprises an attaching base 41 and a second hair strand 42 fixed to the attaching base 41. The attaching base 41 is adhered to the rear surface 318 of the hair transplantation base 31 by a binding glue, so as to fix and mount the second hair weft unit 40 to the first hair weft unit 30.

[0287] According to this embodiment, the attaching base 41 can be formed by a glue material, such as a mixture of polyurethane glue, adhesive, and thinner or diluent. The adhesive can be but not limited to isocyanates and polyester polyols. The thinner can be but not limited to ethyl acetate, xylene, acetone, and methyl ethyl ketone. Preferably, a weight content of polyurethane glue is ranged from 40%-60%, a weight content of adhesive is ranged from 10%-30%, and a weight content of thinner is ranged from 20%-40%.

[0288] The binding glue for attaching the attaching base 41 to the hair transplantation base 31 may contain one or more of epoxy resin, polyurethane, acrylic resin adhesive, phenolic resin adhesive, polyester resin adhesive, and neoprene adhesive. Alternatively, the attaching base 41 may be attached to the hair transplantation base 31 by the above mentioned double-sided tape 43.

[0289] The second hair strand 42 comprises a plurality of second hair elements 421 and each of the plurality of second hair elements 421 comprises a second end fixing portion 4211 and a second hair body portion 4212 which is integrally extended from the corresponding second end fixing portion 4211. In this embodiment, the second end fixing portion 4211 of each second hair element 421 is embedded in the attaching base 41. A top end of the second hair body portion 4212 is extended from a bottom edge 411 of the attaching base 411 and is preferred to be extending from a position corresponding to a bottom edge 317 of the hair transplantation base 31. The first hair body portion 3213 of each first hair element 321 of the first hair strand 32 and the second hair body portion 4212 of each second hair element 421 of the second hair strand 42 are provided at two opposite sides of the hair transplantation base 31, so that the two hair weft units are combined to result in a final product that meets a high volume requirement.

[0290] In addition, the attaching unit 50 of the third embodiment and the fourth embodiment can be embodied as the above mentioned clipping element 51 or the above mentioned double-sided binding tape 52.

[0291] It is to be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Furthermore, the terms including, having, or any other variant thereof, are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus including a set of elements includes not only those elements, but also other elements not expressly listed, or elements that are inherent to such process, method, article, or apparatus may be included. Without further limitation, the fact that an element is defined by the phrase including a . . . does not exclude the existence of another identical element in the process, method, article, or apparatus including the element.

[0292] Each of the embodiments in this specification is described in a related manner, and it is sufficient to refer to each embodiment for similarities between embodiments, and each embodiment focuses on the differences from other embodiments. In particular, for a system embodiment, since it is basically similar to the method embodiment, it is described in a simpler manner, and it is sufficient to refer to a part of the description of the method embodiment where relevant.

[0293] The above description is only some embodiments of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure are included in the scope of the present disclosure.