BONDED-TYPE KNITTED NET AND BALE NET

Abstract

The present disclosure discloses a bonded-type knitted net and a bale net, belonging to the technical field of net knitting. In the bonded-type knitted net according to the present disclosure, warp yarns are arranged in parallel in a warp direction, weft yarns are distributed in a zigzag shape between every two adjacent warp yarns, and junction points between the warp yarns and the weft yarns are connected by bonding. Since there are no knots in the warp yarns, a strength loss caused by knotting in the warp yarns during knitting is eliminated, thus improving a strength. A stretch rate of the warp yarns in the knitted net is 30% to 80%, which maintains a high tensile strength on a basis of certain stretchability. In addition, a knitting width can be controlled according to a need and an efficiency is higher.

Claims

1. A bonded-type knitted net, comprising warp yarns (1) and weft yarns (2), the warp yarns (1) being arranged in parallel in a warp direction, the weft yarns (2) being distributed in a zigzag shape between every two adjacent warp yarns (1), and junction points between the warp yarns (1) and the weft yarns (2) being connected by bonding; and a stretch rate of the warp yarns (1) in the knitted net being 30% to 80%.

2. The bonded-type knitted net according to claim 1, wherein the warp yarns (1) and the weft yarns (2) are yarns made of polyethylene, polypropylene, or a combination thereof; or the warp yarns (1) and the weft yarns (2) are yarns made of polyethylene, and the junction points between the warp yarns (1) and the weft yarns (2) are connected by thermal bonding.

3. The bonded-type knitted net according to claim 1, wherein the warp yarns (1) are yarns of 600 to 1200 deniers.

4. The bonded-type knitted net according to claim 1, wherein the weft yarns (2) form fulcrum angles (3) at two ends of a weft direction, and top ends of the fulcrum angles (3) of the weft yarns (2) are connected with the warp yarns (1); or the weft yarns (2) form fulcrum angles (3) at two ends of a weft direction, two connection points are formed at junctions between the fulcrum angles (3) and the warp yarns (1), and loops with a gap are formed between the fulcrum angles and the warp yarns (1); or the weft yarns (2) form fulcrum angles (3) at two ends of a weft direction, two connection points are formed at junctions between the fulcrum angles (3) and the warp yarns (1), loops with a gap are formed between the fulcrum angles and the warp yarns (1), and a distance between the two connection points is 2 mm to 60 mm.

5. The bonded-type knitted net according to claim 4, wherein the warp yarns (1) are located on a same side of side lines of the fulcrum angles, or pass between two side lines forming each fulcrum angle.

6. The bonded-type knitted net according to claim 1, wherein a distance between every two adjacent warp yarns (1) is 1 cm to 8 cm.

7. The bonded-type knitted net according to claim 1, wherein each warp yarn (1) comprises one to four sub-yarns arranged in the warp direction, and in case of two or more sub-yarns, a plurality of sub-yarns are arranged in parallel in a warp direction.

8. A bonded-type knitted net, comprising warp yarns (1) and weft yarns (2), the warp yarns (1) being arranged in parallel in a warp direction, the weft yarns (2) being distributed in a zigzag shape between every two adjacent warp yarns (1), and junction points between the warp yarns (1) and the weft yarns (2) being connected by thermal bonding.

9. The bonded-type knitted net according to claim 8, wherein the warp yarns (1) or the weft yarns (2) are monofilament yarns or film filament yarns made of polyethylene, polypropylene, or a mixture of polyethylene and polypropylene.

10. The bonded-type knitted net according to claim 8, wherein each weft yarn (2) comprises one to four sub-yarns arranged in the warp direction, and in case of two or more sub-yarns, a plurality of sub-yarns are arranged in parallel in a warp direction.

11. The bonded-type knitted net according to claim 10, wherein a stretch rate of the sub-yarns is 40% to 75%.

12. A bonded-type knitted net, comprising warp yarns (1) and weft yarns (2), at least two of the weft yarns (2) being arranged in parallel in a weft direction, and each weft yarn (2) being in a zigzag shape, and fulcrum angles (3) of the weft yarns (2) at ends of the weft direction being located at a same weft height; and two to eight warp yarns (1) being located on each weft yarn (2) and arranged in parallel in a warp direction, and junction points between the warp yarns (1) and the weft yarns (2) being connected by thermal bonding.

13. The bonded-type knitted net according to claim 12, wherein a width D of each weft yarn (2) is 2 cm to 20 cm.

14. The bonded-type knitted net according to claim 13, wherein a spacing P between every two adjacent fulcrum angles on a same side of each weft yarn (2) is 2.0 cm to 10.0 cm.

15. The bonded-type knitted net according to claim 12, wherein each weft yarn (2) is connected with at least three warp yarns (1).

16. The bonded-type knitted net according to claim 15, wherein the warp yarns (1) are distributed at equal spacing.

17. The bonded-type knitted net according to claim 12, wherein the warp yarns (1) or the weft yarns (2) are monofilament yarns or film filament yarns made of polyethylene, polypropylene, or a mixture of polyethylene and polypropylene.

18. The bonded-type knitted net according to claim 12, wherein a gram weight of the knitted net is 3.5 g/m.sup.2 to 7.8 g/m.sup.2.

19. The bonded-type knitted net according to claim 12, wherein a stretch rate of the warp yarns (1) is 35% to 70%.

20. The bonded-type knitted net according to claim 12, wherein a stretch rate of the weft yarns (2) is 40% to 75%, and the stretch rate of the weft yarns (2) is not less than that of the warp yarns (1).

21. A bale net, adopting a structure of the bonded-type knitted net according to claim land formed into a columnar structure by winding the bonded-type knitted net.

22. The bale net according to claim 21, wherein the bale net further comprises a core tube and the knitted net is wound on the core tube.

23. The bale net according to claim 22, wherein the core tube is a paper core tube or a plastic core tube.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG. 1 is a schematic structural diagram of an existing bale wrap net.

[0043] FIG. 2 is a schematic structural diagram of a bale wrap net with warp insertions.

[0044] FIG. 3 is a schematic diagram of an implementation structure of a bonded-type knitted net.

[0045] FIG. 4 is a schematic diagram of single-point connection between warp yarns and weft yarns.

[0046] FIG. 5 is a schematic diagram of an implementation of a bonded-type knitted net.

[0047] FIG. 6 is a diagram of comparison between fulcrum angles.

[0048] FIG. 7 is a schematic diagram of distribution of sub-yarns of a warp yarn.

[0049] FIG. 8 is a schematic diagram of an implementation of a bonded-type knitted net.

Description of Reference Signs

[0050] 001warp chain; [0051] 002weft insertion; [0052] 003warp insertion; [0053] 1warp yarn; [0054] 2weft yarn; and [0055] 3fulcrum angle.

DETAILED DESCRIPTION

[0056] To further understand the content of the present disclosure, the present disclosure will be described below in detail in combination with the embodiments with reference to the drawings.

[0057] The structure, scale, size and the like shown in the drawings of the description are only for the purpose of cooperating with the content disclosed in the description, for the understanding and reading of those skilled in the art, and are not intended to limit the conditions under which the present disclosure can be implemented. Therefore, they do not have substantive technical significance. Any modification of the structure, change in scale relationship, or adjustment of size without affecting the efficacy and purpose that can be achieved by the present disclosure should still fall within the scope of the technical content disclosed in the present disclosure. In addition, the terms such as up, down, left, right, and middle used in the description are only for the sake of clarity in description, and are not intended to limit the scope of implementation. Any changes or adjustments in their relative relationships, without substantial changes in technical content, should also be deemed to be within the scope of implementation of the present disclosure.

[0058] FIG. 1 illustrates a schematic structural diagram of an existing bale wrap net. Warp chains 001 are arranged in parallel, and warp chains 1 are connected with each other through weft insertions 002. This structure results in a decrease in strength due to warp looping in the warp chains.

[0059] FIG. 2 illustrates an improved bale wrap net structure. As an improvement thereof, warp insertions 003 are added to the warp chains 001. The warp insertions 003 adopt a straight structure, and are not knotted or looped, so there is no direct strength loss caused by knotting, thus providing a main tensile force in a warp direction.

[0060] The warp insertions with a straight structure can increase the strength, but due to the need to connect with weft insertions, they also need to be used in conjunction with looped warps to connect different warps and prevent warps from playing after knitting.

Embodiment 1

[0061] Referring to FIG. 3, this embodiment provides a bonded-type knitted net, including warp yarns 1 and weft yarns 2. The warp yarns 1 are arranged in parallel in a warp direction. The weft yarns 2 are distributed in a zigzag shape between every two adjacent warp yarns 1. Junction points between the warp yarns 1 and the weft yarns 2 are connected by bonding. A stretch rate of the warp yarns 1 in the knitted net is 30% to 80%.

[0062] A distance between every two warp yarns 1 arranged in parallel may be controlled within a certain range, and may be adjusted according to a material to be wrapped. Generally, it may be set within 1 cm to 12 cm, such as 3.0 cm, 6.2 cm, or 8.4 cm. Each warp yarn 1 here does not only refer to a film filament. In some embodiments, each warp yarn 1 may also be formed by twisting multiple filaments together.

[0063] In this embodiment, the weft yarns 2 mainly play a connecting role, so that the warp yarns 1 are connected into a whole. In this embodiment, the weft yarns 2 are distributed in a zigzag shape between every two adjacent warp yarns 1.

[0064] It should be stated that in this embodiment and other embodiments, the zigzag shape refers to the overall shape formed by the weft yarns 2 alternately spaced from left to right along the warp direction, or the zigzag shape formed by the alternating left and right weft yarns and the warp yarns together, without requiring the zigzag ends to be triangular or trapezoidal. As shown in FIG. 3, ends thereof form fulcrum angles, and the fulcrum angles are sharp angles. As shown in FIG. 5, the fulcrum angles may also be trapezoid-like structures. In addition, the shape shown in the figure is a shape determined according to the manufacturing state. In actual products, since the warp yarns 1 and weft yarns 2 are both flexible materials, when not positioned, the fulcrum angle parts generally present a free and loose irregular state, such as an arc shape, which should also be considered as a zigzag shape on the whole.

[0065] In addition, in this embodiment, since the weft yarns are distributed in a zigzag shape which reciprocates from left to right in a short distance, forming this structure requires fulcrums to shape the weft yarns. During manufacturing, the weft yarns change direction at the fulcrums, resulting in fulcrum angles.

[0066] In this embodiment, junction points between the warp yarns 1 and the weft yarns 2 are connected by bonding. For example, during manufacturing, hot melt adhesive is first placed at fixed points on the warp yarns 1 or the weft yarns 2, which are then bonded through a heating zone or hot pressing. They may also be bonded directly in other ways without heating.

[0067] The warp yarns 1 and the weft yarns 2 may be made of polyethylene or polypropylene, or a mixture of polyethylene and polypropylene. A thin film is formed through a film-forming process, and then cut into yarns. Due to an inverse relationship between tensile strength and elasticity under certain conditions, the knitted net product needs to bear a large tensile force during use. In order to ensure its strength, in this embodiment, the stretch rate of the warp yarns 1 is limited to 30% to 80%, such as 32% to 40%, 45% to 55%, 56% to 62%, or 65% to 80%.

[0068] The stretch rate referred to in the present disclosure refers to a ratio of the length increased by stretching to an original length when the yarn is stretched broken. Since the knitted net is generally used in situations where the load to be borne is not large, it is required to have certain stretch rate and strength at the same time. If the effect of heating on the yarns is ignored in order to achieve thermal bonding, it will result in insufficient strength. Therefore, it is required that the stretch rate of the warp yarns 1 after bonding into a net is between 30% and 80%. More preferably, it may be limited to be between 45% and 70%.

Embodiment 2

[0069] FIG. 4 illustrates a specific implementation. In this implementation, the warp yarns 1 are arranged in parallel, the weft yarns 2 are distributed in a zigzag shape between every two adjacent warp yarns 1, ends of the weft yarns 2 form fulcrum angles 3, and ends of the fulcrum angles are connected with the warp yarns 1.

[0070] By adopting this structure, the warp yarns 1 need to pass between the two side lines of each fulcrum angle, so that the ends of the fulcrum angles are exactly in contact with the top surface and bottom surface of the warp yarns 1. This method may be achieved by bonding using adhesive dispensing technology during knitting, or may be achieved by firstly knitting and laying the yarns, and then thermal bonding.

[0071] Thermal bonding may be achieved by directly using heating to locally melt and bond the warp yarns 1 and the weft yarns 2, that is, by heating them locally at fixed points to bond them together, or by using hot melt adhesive for bonding.

Embodiment 3

[0072] As another implementation of FIG. 4, the warp yarns 1 are arranged in parallel, the weft yarns 2 are distributed in a zigzag shape between every two adjacent warp yarns 1, ends of the weft yarns 2 form fulcrum angles 3, the two side lines of each fulcrum angle 3 of the weft yarns 2 are laid on a same side of the warp yarns 1, and a top end of each fulcrum angle 3 is connected with the warp yarn 1 to form a connection point.

[0073] For the specific bonding method, a reference may be made to the solutions in other embodiments. In order to achieve the manufacturing of the knitted net structure in this embodiment, it is necessary to set fulcrums to hook the weft yarns 2 for shaping, and then connect the warp yarns 1 and the weft yarns 2 through bonding, which inevitably forms fulcrum angles 3 protruding from the warp yarns 1 at the ends. When there is only one connection point, the fulcrum angle 3 and the warp yarn 1 are bonded together, and there is no gap formed between the fulcrum angle 3 and the warp yarn 1. This method can allow the fulcrum to support a part of the weft yarn, thus avoiding a gap. The gap between the fulcrum angle and the warp yarn may also be removed during bonding.

Embodiment 4

[0074] FIG. 3 illustrates another implementation. In FIG. 3, each fulcrum angle 3 of the weft yarn 2 protrudes from the warp yarn 1 in a weft direction and forms two connection points at the junction with the warp yarn 1. A certain gap is formed between the fulcrum angle 3 and the warp yarn. After bonding, a closed fulcrum loop is formed. The fulcrum loop may be formed by the weft yarn only or by the warp yarn and the weft yarn jointly. When the fulcrum is thin, the gap inside the closed loop may be very small and may be less than 1 mm.

[0075] There is a significant difference between the knitted net bonding process and the knitting process. Knitting can be done by looping directly, and the weft yarns are connected by knotting. However, in the bonding process of the present disclosure, since it is required to avoid knotting of the warp yarns, the weft yarns 2 are not easily shaped. Therefore, during the manufacturing of the knitted net, the yarns may be laid and shaped first.

[0076] In order to achieve the manufacturing of the knitted net structure in this embodiment, it is necessary to set fulcrums to hook the weft yarns 2 for shaping, and then connect the warp yarns 1 and the weft yarns 2 through bonding, which inevitably forms fulcrum angles 3 protruding from the warp yarns 1 at the ends. In order to simplify the process, in this embodiment, each fulcrum is arranged on an outer side of the warp yarn, and the weft yarn can change direction around the fulcrum. Since the warp yarn also moves synchronously and travels a certain distance, two junction points are formed between the warp yarn 1 and the weft yarn 2. After bonding, the warp yarn and the weft yarn between the two connection points form a closed loop, namely the fulcrum loop.

[0077] It needs to be stated that for the two junction points between the warp yarn 1 and the weft yarn 2, they may be an integral bonding point or two independent bonding points during bonding.

[0078] As shown in FIG. 3, the fulcrum angle 3 is close to the warp yarn 1. During bonding using adhesive dispensing technology, only one bonding point may be used to bond two connection points. If a distance between two connection points is large, they may be bonded separately.

Embodiment 5

[0079] FIG. 5 illustrates another implementation. In this embodiment, two warp yarns 1 are laid on the same side of the side lines of the fulcrum angle 3. The zigzag parts of the warp yarn 1 and the weft yarn 2 form two connection points, and the distance between the two connection points is relatively large, and the spacing may be 2 mm to 60 mm, preferably, the distance between the two connection points is 2 mm to 8 mm. At this position of 2 mm to 60 mm, preferably 2 mm to 8 mm, a closed loop is formed between the weft yarn segment corresponding to the fulcrum angle 3 and the warp yarn 1.

[0080] When the spacing is large, if one fulcrum is used to position the warp yarn 1, a larger transverse distance will be formed in the weft direction, resulting in more leftover of the weft yarn 2. As shown in FIG. 6, a distance between the fulcrum Q and the yarn is relatively large, forming a triangle and resulting more leftover. When using the fulcrum A and the fulcrum B jointly, a trapezoid will be formed, and a length of the leftover is equivalent to a length of the spacing, which can avoid material waste.

[0081] It needs to be stated that whether using a single fulcrum or two fulcrums, the state of the knitted net after manufacturing is that there will be some weft yarn 2 at an edge of the warp yarn 1. This part of weft yarn 2 is due to the leftover left by the fulcrum in the shaping of the weft yarn during manufacturing, and it presents a relatively loose state after manufacturing. It is not required to present a triangular or trapezoidal structure, but it may also be any other structure, such as arc-shaped protrusion.

Embodiment 6

[0082] FIG. 7 illustrates another implementation. In this implementation, each warp yarn 1 includes one to four sub-yarns arranged in the warp direction, and in case of two or more sub-yarns, multiple sub-yarns are arranged in parallel in the weft direction.

[0083] In case of only one sub-yarn, the warp yarn 1 is the sub-yarn. In case of two or more sub-yarns spaced apart, they jointly form the warp yarn 1 in this embodiment. Preferably, the sub-yarns may have a spacing of 1 mm to 3 mm.

Embodiment 7

[0084] As a further definition to the warp yarns, the warp yarns 1 are yarns of 600 to 1200 deniers, such as 700 deniers, 800 deniers, or 1000 deniers, and are preferably high-density polyethylene film filament yarns.

[0085] A distance between every two adjacent warp yarns 1 may be controlled to be 1 cm to 8 cm, such as 4.0 cm, 5.2 cm, or 6.6 cm.

[0086] In the above embodiments, the weft yarns 2 are arranged in an array in the same state. In other embodiments, every two adjacent weft yarns 2 may also be symmetrically distributed.

Embodiment 8

[0087] As an implementation, a bonded-type knitted net provided in this embodiment includes warp yarns 1 and weft yarns 2. The warp yarns 1 are arranged in parallel in a warp direction. The weft yarns 2 are distributed in a zigzag shape between every two adjacent warp yarns 1. Junction points between the warp yarns 1 and the weft yarns 2 are connected by thermal bonding.

[0088] Specifically, the warp yarns 1 and the weft yarns 2 are polyethylene film filament yarns, and are connected by non-adhesive thermal bonding. The polyethylene film filament yarns exhibit melt viscosity at certain temperature, and can allow the warp yarns 1 and the weft yarns 2 to be bonded together under certain pressure. This manufacturing method does not require additional adhesive and the manufacturing is facilitated. The stretch rate of the warp yarns 1 is defined within a range from 45% to 68%. The stretch rate of the weft yarns 2 is 45% to 90%, which may be further defined to 45% to 75%.

[0089] Preferably, the stretch rate of the weft yarns 2 is not less than that of the warp yarns 1. The weft yarns 2 mainly play a role in connection in the weft direction, which may have a relatively large stretch rate.

[0090] In other implementations, the warp yarns 1 may also be polyethylene film filament yarns, and the weft yarns 2 are made of other materials with similar properties. For example, the warp yarns 1 are polyethylene or polypropylene film filament yarns, and the weft yarns 2 are polypropylene film filament yarns; or both the warp yarns and the weft yarns are monofilament yarns made of a mixture of polyethylene and polypropylene.

Embodiment 9

[0091] As an implementation, based on Embodiment 8, each weft yarn 2 includes two to four sub-yarns arranged in the warp direction, and multiple sub-yarns are arranged in parallel in the weft direction. The sub-yarns and weft yarns 2 are polyethylene film filament yarns. The stretch rate of the sub-yarns is 35% to 65%, which may be further defined to 45% to 58%. The stretch rate of the weft yarns 2 is 40% to 75%.

Embodiment 10

[0092] As an implementation, based on the basic content of the above embodiments, this embodiment defines the distance between the warp yarns and between the weft yarns. The distance S between the warp yarns 1 is 1 cm to 10 cm, which may be further defined to 3 cm to 8 cm, such as 4.0 cm, 6.0 cm, or 8.2 cm.

[0093] The width D of the weft yarns 2 is 2 cm to 10 cm, such as 2.5 cm, 3.5 cm, 6.0 cm, or 8.0 cm. The spacing P between every two adjacent fulcrum angles on the same side of each weft yarn 2 is 2.0 cm to 10.0 cm, preferably, the spacing P is 2 cm to 7.5 cm, such as 4 cm or 6 cm.

Embodiment 11

[0094] In conjunction with FIG. 8, a bonded-type knitted net provided in this embodiment includes warp yarns 1 and weft yarns 2. At least two of the weft yarns 2 are arranged in parallel in a weft direction, and each weft yarn 2 is in a zigzag shape. Fulcrum angles are located at the same weft height. The warp yarns 1 are arranged in parallel in the warp direction, and junction points between the warp yarns 1 and the weft yarns 2 are connected by thermal bonding.

[0095] Two to eight warp yarns are arranged on each weft yarn. In case of two warp yarns 1, the warp yarns 1 are arranged at the two zigzag ends of the weft yarn 2. In case of three to eight warp yarns, the warp yarns may be distributed at equal spacing. By adopting this structure, the pay-off needle for each weft yarn can move within a certain range to form a zigzag structure, thus achieving continuous production. In this embodiment, the width D of each weft yarn 2 may be larger, ranging from 2 cm to 20 cm.

[0096] Since the warp yarns 1 and weft yarns 2 are both flexible materials, when not positioned, the fulcrum angle parts generally present a free and loose irregular state, and in a tensioned state, can form an arc shape, or a shorter line segment in parallel to the warp yarn, which should also be considered as a zigzag shape on the whole.

[0097] As a specific implementation, each weft yarn 2 is connected with three warp yarns 1. The warp yarns 1 are distributed at equal spacing. The warp yarns 1 or the weft yarns 2 are polyethylene monofilament yarns or polyethylene film filament yarns.

[0098] The stretch rate of the warp yarns 1 is 48% to 65%. The stretch rate of the weft yarns 2 is 50% to 70%. The gram weight of the knitted net is 3.5 g/m.sup.2 to 7.8 g/m.sup.2. Under the condition of meeting the strength requirement, materials with relatively light gram weight may be selected.

Embodiment 12

[0099] This embodiment provides a bale net, adopting the implementation solution of the bonded-type knitted net described above or a combined implementation solution thereof, and is formed into a columnar structure by winding the bonded-type knitted net. When in use, the width of the bale net may be controlled by knitting and bonding according to the need.

[0100] In some implementations, the bale net further includes a core tube and the knitted net is wound on the core tube to form a rolled bale net. The core tube is a paper core tube or a plastic core tube.

[0101] The bale net can be used to tie up straw and rice straw, and package waste materials. The knitted net may also be used for secondary manufacturing to produce products such as lifting belts. The application environment is not specifically limited.

[0102] The present disclosure and its implementations have been schematically described above and the description is not restrictive. For example, in some embodiments, the width of the weft yarn is described, while in other embodiments not specifically described, other widths may be adopted. In some embodiments, high-density polyethylene is used as the warp yarn material, and this feature may also be combined with the features in other embodiments.

[0103] In addition, the polyethylene material, polypropylene material or combination thereof referred to in the embodiments may be added with a small amount of additives in use to improve the material properties, for example, some materials to improve the melting property to facilitate bonding, which should also be considered as a polyethylene material, polypropylene material, or combination thereof.

[0104] What is shown in each figure is just one of implementations of the present disclosure. The actual structure is not limited thereto. Therefore, those skilled in the art may be inspired thereby and, without departing from the essence of the present disclosure, design structures and embodiments similar to the technical solution without contributing any inventive step, which, however, should all fall within the scope of protection of the present disclosure.