YARN, APPARATUS AND METHODS PREPARING THEREOF

Abstract

The present disclosure provides composite yarn, apparatus and methods preparing thereof. The composite yarn of the present disclosure includes wrapping fibers and a central yarn that is formed by a first body yarn and a second body yarn, wherein a portion of the wrapping fibers are combined with the central yarn in at least one of the following states: a first state, a portion of the wrapping fibers wrap around the first body yarn or the second body yarn; a second state, a portion of the wrapping fibers wrap around the first body yarn and the second body yarn respectively at the same time; a third state, a portion of the wrapping fibers wrap around the central yarn. The composite yarn of the present disclosure has low twist factor and high strength, which solves the problem of severe strength loss associated with low twist factors existing in conventional low-twist techniques.

Claims

1. A composite yarn (2), comprising a central yarn (18) and wrapping fibers (19), wherein the central yarn (18) comprises a first body yarn (16a) and a second body yarn (16b); and wherein the wrapping fibers (19) are combined with the central yarn (18) in at least one of the following states: a first state: a portion of the wrapping fibers (19) wrap around the first body yarn (16a) or the second body yarn (16b); a second state: a portion of the wrapping fibers (19) wrap around the first body yarn (16a) and the second body yarn (16b) respectively; and a third state: a portion of the wrapping fibers (19) wrap around the central yarn (18).

2. The composite yarn (2) of claim 1, wherein the portion of the wrapping fibers (19) are combined with the central yarn (18) in both the first state and the third state, wherein the portion of the wrapping fibers (19) in the first state have a wrapping direction opposite to the wrapping direction of the portion of the wrapping fibers (19) in the third state.

3. The composite yarn (2) of claim 1, wherein a first portion of the wrapping fibers (19) are combined with the central yarn (18) in the first state; a second portion of the wrapping fibers (19) are combined with the central yarn (18) in the second state; and a third portion of the wrapping fibers (19) are combined with the central yarn (18) in both the first state and the third state, wherein the third portion of the wrapping fibers (19) in the first state have a wrapping direction opposite to the wrapping direction of the third portion of the wrapping fibers (19) in the third state.

4. The composite yarn (2) of claim 1, wherein the first body yarn (16a) and the second body yarn (16b) are arranged in parallel to form the central yarn (18).

5. The composite yarn (2) of claim 1, wherein the first body yarn (16a) and the second body yarn (16b) twist with each other to form the central yarn (18).

6. The composite yarn (2) of claim 1, wherein the first body yarn (16a) has a yarn count of 5-200 denier, and the second body yarn (16b) has a yarn count of 5-200 denier.

7. The composite yarn (2) of claim 1, wherein the weight percentage of the first body yarn (16a) and the second body yarn (16b) to the total weight of the composite yarn (2) is 60% to 65%.

8. The composite yarn (2) of claim 1, wherein the twist factor of the central yarn (18) is 0 to 1.5.

9. An apparatus for preparing the composite yarn of claim 1, comprising: at least one back roller (11a) for infeeding at least one roving (12) comprising at least one short fiber (12a); at least one front roller (11b) for infeeding a first filament (13a), a second filament (13b) and the at least one roving (12) outfeeding from the at least one back roller, the at least one roving (12) being positioned between the first filament (13a) and the second filament (13b) at the at least one front roller (11b); and a false twisting device (14) in front of the at least one front roller (11b) for infeeding the first filament (13a) and the second filament (13b) and the at least one roving (12) outfeeding from the at least one front roller (11b), so that the at least one roving (12) is combined with the first filament (13a) and/or the second filament (13b) to form the composite yarn (2), wherein the first filament (13a) and the second filament (13b) together form the central yarn (18) of the composite yarn (2), and the at least one roving (12) forms the wrapping fibers (19) of the composite yarn (2).

10. The apparatus of claim 9, wherein the front roller (11b) and the false twisting device (14) are configured to form a twisting triangle region between the front roller (11b) and the false twisting device (14) so that a first portion of the at least one short fiber (12a) of the at least one roving (12) wraps around the first filament (13a) or the second filament (13b) within the twisting triangle region, and a second portion of the at least one short fiber (12a) of the roving (12) remains free.

11. The apparatus of claim 9, further comprising a winding device (20) in front of the false twisting device (14) for directly winding the composite yarn (2).

12. The apparatus of claim 11, wherein the winding device (20) comprises a twisting element for twisting the composite yarn (2) during the winding.

13. A method for preparing the composite yarn (2) using the apparatus of claim 11, comprising: infeeding a first filament (13a) and a second filament (13b) into the front roller (11b), wherein the first filament (13a) and the second filament (13b) are separate by a distance at the front roller (11b) so that the first filament (13a) and the second filament (13b) form a twisting triangle region before entering the false twisting device (14); infeeding at least one roving (12) comprising at least one short fiber (12a) into the back roller (11a), and outfeeding the at least one roving (12) from the front roller (11b), wherein the at least one roving (12) is positioned between the first filament (13a) and the second filament (13b) at the front roller (11b); infeeding the first filament (13a) and the second filament (13b) and the at least one roving (12) into the false twisting device (14) to form the composite yarn (2), wherein the first filament (13a) forms the first body yarn (16a), the second filament (13b) forms the second body yarn (16b), and the at least one roving (12) forms the wrapping fibers (19), the first body yarn (16a) and the second body yarn (16b) being arranged to form the central yarn (18), and the wrapping fibers (19) being combined with the central yarn (18) in at least one of the following ways: a first way: a portion of the wrapping fibers (19) wrap around the first body yarn (16a) or the second body yarn (16b); a second way: a portion of the wrapping fibers (19) wrap around the first body yarn (16a) and the second body yarn (16b) respectively; and a third way: a portion of the wrapping fibers (19) wrap around the central yarn (18).

14. The method of claim 13, wherein the distance is 1.0 mm to 20 mm.

15. The method of claim 13, wherein the yarn count (Ne) of the central yarn (18) is 2.5 to 120.

16. The method of claim 13, wherein the portion of the wrapping fibers (19) are combined with the central yarn (18) in both the first way and the third way, wherein the portion of the wrapping fibers (19) in the first way have a wrapping direction opposite to the wrapping direction of the portion of the wrapping fibers (19) in the third way.

17. The method of claim 13, wherein in the second way, the wrapping directions of the portion of the wrapping fibers (19) around the first body yarn (16a) and the second body yarn (16b) are the same.

18. The method of claim 13, further comprising twisting the first filament (13a) and the second filament (13b) while infeeding the first filament (13a) and the second filament (13b) into the false twisting device (14).

19. The method of claim 13, further comprising directly winding the composite yarn (2).

20. The method of claim 13, further comprising twisting while winding the composite yarn (2).

Description

BRIEF DESCRIPTION OF DRAWINGS

[0028] It should be understood that the drawings described herein are for illustration purposes only. The drawings are not necessarily to scale, with emphasis generally being placed upon illustrating the principles of the present teachings. The drawings are not intended to limit the scope of the present teachings in any way.

[0029] FIG. 1 shows the illustration of the apparatus for making the composite yarn according to certain embodiments described herein.

[0030] FIG. 2A shows the structural illustration of the composite yarn according to certain embodiments described herein.

[0031] FIG. 2B shows the cross-sectional illustration at D-D of the composite yarn in FIG. 2A according to certain embodiments described herein.

[0032] FIG. 2C shows the partial structural illustration of the composite yarn according to certain embodiments described herein.

[0033] FIGS. 3A and 3B show the illustrations of the twisting triangle region of the composite yarn apparatus according to certain embodiments described herein.

[0034] FIGS. 4A and 4B show the structural illustration of the central yarn of the composite yarn according to certain embodiments described herein.

[0035] FIGS. 5A-5C and 6A-6C show the partial structural illustration of the composite yarn according to certain embodiments described herein.

[0036] FIG. 7 shows the scanning electron microscopic image of the cross-section at D-D of the composite yarn according to certain embodiments described herein shown in FIG. 2A.

[0037] FIG. 8 shows the properties of the composite yarn according to certain embodiments described herein and the properties of the control composite yarn.

DETAILED DESCRIPTION

[0038] The principles of the present disclosure are explained in conjunction with the following embodiments of the present disclosure. Detailed description of the embodiments and examples are provided in the present disclosure to enable those skilled in the art to practice the present disclosure. It should be understood that other embodiments may be utilized, and modifications may be made without departing from the spirit of the present disclosure.

[0039] As shown in FIG. 1, the composite yarn apparatus of the present disclosure mainly comprises at least one back roller 11a, at least one roving bobbin 10c wound with at least one roving 12, at least one front roller 11b, and two filament bobbins 10a and 10b wound with filaments 13a and 13b behind the front roller 11b. The at least one roving bobbin 10c and the two filament bobbins 10a and 10b are arranged such that the roving 12 unwound from the roving bobbin 10c is located between the two filaments 13a and 13b unwound from the two filament bobbins 10a and 10b at the front roller 11b. In certain embodiments, the two filament bobbins 10a and 10b are located behind the back roller 11a, and the two filament bobbins 10a and 10b are located above the roving bobbin 10c and are respectively located at each side of the roving bobbin 10c. In certain embodiments, the two filament bobbins 10a and 10b are located in front of the back roller 11a and are respectively located at each side of the roving bobbin 10c. The two filament bobbins 10a and 10b can also be located below the roving bobbin 10c or in the same plane thereof. The distance between the two filaments 13a and 13b at the front roller 11b can be about 1 mm to about 20 mm, about 2 mm to about 19 mm, about 3 mm to about 18 mm, about 4 mm to about 17 mm, about 5 mm to about 16 mm, about 6 mm to about 15 mm, about 7 mm to about 14 mm, about 8 mm to about 13 mm, about 9 mm to about 12 mm, or about 10 mm to about 11 mm. In certain embodiments, the distance between the two filaments 13a and 13b at the front roller 11b is about 1.5 mm to about 3.5 mm.

[0040] The composite yarn apparatus of the present disclosure can further comprise a false twisting device 14 located in front of the front roller 11b. The false twisting device 14 of the present disclosure can be used for applying false twist onto the fibers, filaments, and/or yarns passing therethrough. The false twisting device 14 of the present disclosure can be a rubber false twisting device, a urethane false twisting device, an inlaid copper grooves and plastic false twisting device, or any other false twisting devices known to those skilled in the art that have false twisting functions.

[0041] The false twisting device 14 in front of the front roller 11b can be arranged such that a twisting triangle region is formed between the front roller 11b and the false twisting device 14. The twisting triangle region allows the first filament 13a, the second filament 13b, and the at least one roving 12 comprising at least one short fiber 12a to be intertwined or combined in a special manner. In certain embodiments, one portion of the at least one short fiber 12a of the roving 12 wraps around the first filament 13a or the second filament 13b, and the other portion remains free, as shown in FIG. 3A and FIG. 3B. As shown in FIG. 3B, the twisting direction of the first filaments 13a can be Z or S, and the twisting direction of the second filaments 13b can be Z or S. The false twisting device 14 can be used for false twisting the first filament 13a, the second filament 13b, and the roving comprising at least one short fiber with one portion wrapping around the first filament 13a or the second filament 13b and the other portion being free, so that the free portion of the short fiber can wrap around the composite yarn formed by the first filament 13a, the second filament 13b, and the roving 12 in an opposite direction, as shown in FIGS. 2C, 5C, and 6C.

[0042] The composite yarn apparatus of the present disclosure can further comprise a winding device 20 located in front of the false twisting device 14. The winding device 20 can be used for directly winding the composite yarn of the present disclosure. The winding device 20 can further comprise a twisting element for twisting the composite yarn while winding the composite yarn.

[0043] During the operation, the first filament 13a and the second filament 13b are unwound from the first filament bobbin 10a and the second filament bobbin 10b before being fed into the frond roller 11b of the composite yarn apparatus of the present disclosure. The first filament 13a can be an elastic filament or an inelastic filament, such as a nylon filament, an acrylic filament, a polyester filament, a viscose filament, a spandex filament, or a silk filament; second filament 13b can also be an elastic filament or an inelastic filaments, such as a nylon filaments, an acrylic filament, a polyester filaments, a viscose filaments, a spandex filament, or a silk filament. In certain embodiments, the first filament 13a has a yarn count of about 5 denier to about 200 denier, about 15 denier to about 190 denier, about 25 denier to about 180 denier, about 35 denier to about 170 denier, about 45 denier to about 160 denier, about 55 denier to about 150 denier, about 65 denier to about 140 denier, about 75 denier to about 130 denier, about 85 denier to about 120 denier, or about 95 denier to about 110 denier. In certain embodiments, the first filament 13a has a yarn count of about 10 denier to about 180 denier. In certain embodiments, the second filament 13b has a yarn count of about 5 denier to about 200 denier, about 15 denier to about 190 denier, about 25 denier to about 180 denier, about 35 denier to about 170 denier, about 45 denier to about 160 denier, about 55 denier to about 150 denier, about 65 denier to about 140 denier, about 75 denier to about 130 denier, about 85 denier to about 120 denier, or about 95 denier to about 110 denier. In certain embodiments, the second filament 13b has a yarn count of about 10 denier to about 180 denier. The first filament 13a and the second filament 13b are separated by a distance at the front roller 11b, wherein the distance can be about 1 mm to about 20 mm, about 2 mm to about 19 mm, about 3 mm to about 18 mm, about 4 mm to about 17 mm, about 5 mm to about 16 mm, about 6 mm to about 15 mm, about 7 mm to about 14 mm, about 8 mm to about 13 mm, about 9 mm to about 12 mm, or about 10 mm to about 11 mm. In certain embodiments, the distance between the first filament 13a and the second filament 13b is about 1.5 mm to about 3.5 mm.

[0044] The roving 12 comprising at least one short fiber 12a can be unwound from the roving bobbin 10c, infed to the back roller 11a, and outfed from the front roller 11b. The positions of the roving 12 at the back roller 11a and the front roller 11b during infeeding can be determined so that the roving 12 is positioned between the first filament 13a and the second filament 13b at the front roller 11b. The short fibers of the roving 12 can be natural short fibers, including but not limited to cotton and wool. The short fibers of the roving 12 can be synthetic short fibers, including but not limited to polyamide and polyester. The short fibers of the roving 12 can also be regenerated short fibers, including but not limited to viscose fibers, cuprammonium fibers, acetate fibers, casein fibers, silk fibroin fibers, and soy protein fibers. The length of the short fibers can be greater than about 28 mm. In certain embodiments, the length of the short fibers can be no larger than about 28 mm, about 27 mm, about 26 mm, about 25 mm, about 24 mm, about 23 mm, about 22 mm, about 21 mm, about 20 mm, about 19 mm, about 18 mm, about 17 mm, about 16 mm, about 15 mm, about 14 mm, about 13 mm, about 12 mm, about 11 mm, about 10 mm, about 9 mm, about 8 mm, about 7 mm, about 6 mm, about 5 mm, about 4 mm, about 3 mm, about 2 mm, or about 1 mm. In certain embodiments, the length of the short fibers is about 25 mm to about 38 mm.

[0045] In certain embodiments, the roving 12 comprising the at least one short fiber 12a and the first filament 13a and the second filament 13b are combined within the twisting triangle region in the following manner: one portion of at least one short fiber 12a of the roving 12 wraps around the first filament 13a or the second filament 13b, and the other portion of at least one short fiber 12a of the roving 12 is free, as shown in FIGS. 3A and 3B. The length of the portion of the short fiber wrapping around the filament and the length of the portion of the short fiber being free can be about 1:1, about 1:2, about 1:3, about 1:4, about 1:5, about 1:6, about 1:7, about 1:8, about 1:9, about 1:10, about 10:1, about 9:1, about 8:1, about 7:1, about 6:1, about 5:1, about 4:1, about 3:1, or about 2:1. In certain embodiments, the twist factors of the first filament 13a and the second filament 13b within the twisting triangle region are about 0, as shown in FIGS. 3A and 4A. In certain embodiments, the twist factors of the first filament 13a and the second filament 13b within the twisting triangle region are greater than 0, which vary depending on the false twisting efficiency. As shown in FIGS. 3B and 4B, the twisting direction of the first filament 13a and the second filament 13b can be Z or S.

[0046] In certain embodiments, the first filament 13a, the second filament 13b and the roving 12 located within the twisting triangle region are fed into the false twisting device 14 for false twisting to form the composite yarn 2. As shown in FIG. 2C and FIGS. 5A-5C, the first filament 13a forms the first body yarn 16a of the composite yarn 2, the second filament 13b forms the second body yarn 16b of the composite yarn 2, and the at least one short fiber 12a of the roving 12 forms the wrapping fibers 19 of the composite yarn 2. The first body yarn 16a and the second body yarn 16b can be arranged to form the central yarn 18, wherein the yarn count (Ne) of the central yarn 18 is about 2.5 to about 120, about 12.5 to about 110, about 22.5 to about 100, about 32.5 to about 90, about 42.5 to about 80, or about 52.5 to about 70. A portion of the wrapping fibers 19 can be combined with the central yarn 18 in at least one of the following ways: a first way, as shown in FIG. 5A: a portion of the wrapping fibers 19 wrap around the first body yarn 16a or the second body yarn 16b, and the wrapping direction can be Z or S; a second way, as shown in FIG. 5B: a portion of the wrapping fibers 19 wrap around the first body yarn 16a and the second body yarn 16b respectively, and the wrapping direction can be Z or S; in certain embodiments, the wrapping directions of the portion of the wrapping fibers 19 around the first body yarn 16a and the second body yarn 16b are the same; and a third way: a portion of the wrapping fibers 19 wrap around the central yarn 18. In certain embodiments, the portion of the wrapping fibers 19 are combined with the central yarn 18 in both the first way and the third way, wherein the portion of the wrapping fibers 19 in the first way have a wrapping direction opposite to the wrapping direction of the portion of the wrapping fibers 19 in the third way, as shown in FIG. 5C. In certain embodiments, the wrapping fibers 19 of the composite yarn 2 are comprised of three portions, wherein the first portion of the wrapping fibers 19 are combined with the central yarn 18 in the first way; the second portion of the wrapping fibers 19 are combined with the central yarn 18 in the second way; and the third portion of the wrapping fibers 19 are combined with the central yarn 18 in both the first way and the third way, as shown in FIG. 6. The composite yarn 2 formed in the manner described herein has a special and novel structure with heterogeneous fiber distributions, which results in a composite yarn with low twist yet high strength. The term body yarn as used herein refers to one or more yarns that are constrained within the inner side of a composite yarn, wherein the body yarn can be a single filament, multiple filaments, or long yarns formed by short fibers. The term wrapping fibers as used herein refers to fibers that can constrain the body yarn of a composite yarn. The term central yarn as used herein refers to the yarns that are constrainedly positioned at or near the central axis of a composite yarn, which can be formed by one or more body yarns, and when the central yarn is formed by multiple body yarns, the multiple body yarns can contact directly with each other and intertwine together to form a central yarn, or the multiple body yarns can be arranged in parallel connected by a portion of the wrapping fibers to form a central yarn with the wrapping fibers as a binder.

[0047] The composite yarn outfed from the false twisting device 14 can be wound into a mass by the winding device 20. In certain embodiments, the composite yarn is wound into a mass directly. In certain embodiments, the composite yarn is twisted while being wound into a mass.

[0048] The composite yarn prepared by the methods and apparatus described herein has a structure with heterogeneous distribution of fibers. In particular, the twist factors of the composite yarn described herein can be approximately 0 with no loss or minimal loss in yarn strength, and the internal torque of the composite yarn described herein can be close to 0. In addition, compared to existing low twist techniques, which can only use long fibers (such as fibers with a length of greater than 28 mm) to make low-twist yarns, the methods described herein can choose a wider range of fiber materials and have no particular requirements on the length of fibers (fibers with a length of less than 28 mm can be used to make low-twist yarns). In other words, the yarn preparation methods described herein are more applicable in terms of the selection of fibers, and the composite yarns prepared thereof show properties of low twist yet high strength, which cannot be achieved by existing composite yarns. Moreover, the weight percentage of the filaments in the composite yarns prepared using the methods described herein can reach up to 60% to 65% with respect to the total weight of the composite yarn, which is advantageous as the price of filaments is generally lower than the price of rovings, making the composite yarns described herein more cost effective compared to existing yarns while not compromising the appearance and hand touch thereof.

[0049] As shown in FIG. 2A and FIGS. 6A-6C, the composite yarn of the present disclosure is a novel yarn with heterogeneous distribution of fibers. The term heterogeneous distribution of fibers refers to different wrapping status of fibers around the central yarn 18 formed by the first body yarn 16a and the second body yarn 16b. The central yarn 18 can be formed by arranging the first body yarn 16a and the second body yarn 16b in parallel. The central yarn 18 can also be formed by twisting the first body yarn 16a and the second body yarn 16b with each other. The first body yarn 16a can at least one elastic or inelastic filament such as nylon filaments, acrylic filaments, polyester filaments, viscose filaments, spandex, or silk. The second body yarn 16b can also be at least one elastic or inelastic filaments, such as nylon filaments, acrylic filaments, polyester filaments, viscose filaments, spandex, or silk. In certain embodiments, the first body yarn 16a has yarn count of about 5 denier to about 200 denier, about 15 denier to about 190 denier, about 25 denier to about 180 denier, about 35 denier to about 170 denier, about 45 denier to about 160 denier, about 55 denier to about 150 denier, about 65 denier to about 140 denier, about 75 denier to about 130 denier, about 85 denier to about 120 denier, or about 95 denier to about 110 denier. In certain embodiments, the first body yarn 16a has yarn count of about 10 denier to about 20 denier. In certain embodiments, the first body yarn 16a has yarn count of about 15 denier. In certain embodiments, the second body yarn 16b has yarn count of about 5 denier to about 200 denier, about 15 denier to about 190 denier, about 25 denier to about 180 denier, about 35 denier to about 170 denier, about 45 denier to about 160 denier, about 55 denier to about 150 denier, about 65 denier to about 140 denier, about 75 denier to about 130 denier, about 85 denier to about 120 denier, or about 95 denier to about 110 denier. In certain embodiments, the second body yarn 16b has yarn count of about 10 denier to about 20 denier. In certain embodiments, the second body yarn 16b has yarn count of about 15 denier.

[0050] In certain embodiments, the short fibers comprising the wrapping fibers 19 are combined with the central yarn 18 mainly in three states. The first state: the short fibers wrap around the first body yarn 16a or the second body yarn 16b, as shown in FIG. 5A; the second state: the short fibers wrap around the first body yarn 16a and the second body yarn 16b respectively, and the wrapping directions are the same (both Z twist or both S twist, as shown in FIG. 5B); the third state: the short fibers wrap around the first body yarn 16a and the central yarn 18 and the wrapping directions are opposite, or the short fibers wrap around the second body yarn 16b and the central yarn 18 and the wrapping directions are opposite, as shown in FIG. 5C. In certain embodiments, more fibers are combined with the central yarn 18 in the first state and the second state than fibers combined with the central yarn 18 in the third state. The short fibers can be natural short fibers, including but not limited to cottons and wools. The short fibers can also be synthetic short fibers, including but not limited to polyamides and polyesters. The short fibers can also be regenerated short fibers, including but not limited to viscose fibers, cuprammonium fibers, acetate fibers, casein fibers, silk fibroin fibers, and soy protein fibers. The length of the short fibers can be greater than about 28 mm. In certain embodiments, the length of the short fibers can be no larger than about 28 mm, about 27 mm, about 26 mm, about 25 mm, about 24 mm, about 23 mm, about 22 mm, about 21 mm, about 20 mm, about 19 mm, about 18 mm, about 17 mm, about 16 mm, about 15 mm, about 14 mm, about 13 mm, about 12 mm, about 11 mm, about 10 mm, about 9 mm, about 8 mm, about 7 mm, about 6 mm, about 5 mm, about 4 mm, about 3 mm, about 2 mm, or about 1 mm. In certain embodiments, the length of the short fibers is about 20 mm to about 38 mm.

[0051] As shown in FIG. 2B and FIG. 7, the first body yarn 16a and the second body yarn 16b can be arranged in parallel without directly touching each other, and the first body yarn 16a and the second body yarn 16b are connected by the wrapping fibers 19 to form the composite yarn.

[0052] The composite yarns having the above-mentioned novel heterogeneous distribution of fibers have advantages over the existing composite yarns, such as low twist and therefore soft and fluffy hand touch, low yarn internal torque, and high strength.

[0053] The following non-limiting examples are illustrative of the low-twist-high-strength composite yarns prepared using the methods in accordance with the invention (FIGS. 6A-6C and FIG. 7) and the low-twist composite yarns prepared using conventional methods:

EXAMPLES

Example 1

Preparation of Low-Twist-High-Strength Composite Yarn According to One Embodiment of the Present Disclosure

[0054] Two nylon filaments with a yarn count of 15 denier were fed into the front roller with a distance of 2.5 mm at the front roller. The rayon was fed into the back roller and was output between the two nylon filaments from the front roller. The two nylon filaments and the rayon were preliminarily twisted in the twisting triangle region before entering the false twisting device for false twisting, and followed by outfeeding from the false twisting device to form the composite yarn, which was then further twisted and wound by the winding device. The yarn count (Ne) of the composite yarn is about 40.

Example 2

Properties of the Low-Twist-High-Strength Composite Yarn According to One Embodiment of the Present Disclosure.

[0055] In the low-twist-high-strength composite yarn prepare according to Example 1, the yarn count of the first body yarn and the second body yarn respectively is 15 denier; the wrapping fibers are formed by the rayon, which takes up 77.5% of the total weight of the composite yarn. The twist factor of the composite yarn is 1.5, wherein the twist factor is calculated by dividing the number of twist per inch by the square root of the yarn count (Ne). The single yarn strength is 308cN (see FIG. 8).

Example 3

Preparation of the Low-Twist Composite Yarns Using the Conventional Method as Control Yarn

[0056] Two nylon filaments with a yarn count of 15 denier were fed into the front roller with a distance of 2.5 mm at the front roller. The rayon was fed into the back roller and was output between the two nylon filaments from the front roller. The two nylon filaments and the rayon were twisted in the twisting triangle region to form the composite yarn, which was then further twisted and wound by the winding device. The yarn count (Ne) of the composite yarn is about 40.

Example 4

Properties of the Low-Twist Composite Yarn (Control Yarn)

[0057] In the low-twist composite yarn prepare according to Example 3, the yarn count of the first body yarn and the second body yarn respectively is 15 denier; the wrapping fibers are formed by the rayon, which takes up 77.5% of the total weight of the composite yarn. The twist factor of the composite yarn is 3.8, wherein the twist factor is calculated by dividing the number of twist per inch by the square root of the yarn count (Ne). The single yarn strength is 299cN (see FIG. 8).