Method for manufacturing a stretchable double-sided female hook-and-loop fastener and double-sided female hook-and-loop fastener

Abstract

To provide a production method of a double surface female die hook and loop fastener which has elasticity and has on both surfaces of front and rear surfaces, a female die engagement element, and the double surface female die hook and loop fastener.SOLUTION: A production method comprises: a step in which, in a state of applying tension to a warp direction, a rubber string 12 is vertically floated and sunk to a weft 11 and the rubber string is woven in the warp direction for forming a flat substrate; a step for weaving a first warp 20 to the weft while alternately performing a sinking number N and a floating number N with respect to once of a floating number M; a step for weaving a second warp 30 to the weft while performing alternately a floating number N and a sinking number N with respect to once of a sinking number M; a step for releasing tension therefore a range of the floating number M on the first warp is at a female die engagement element 40 on a front surface, and a range of the sinking number M on the second warp is at a female die engagement element 41 on a rear surface. When releasing tension to the warp direction, the range of the floating number M on the first warp and the range of the sinking number M on the second warp, are at the female die engagement element (loop) on the rear surface side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a double-sided female surface fastener having elasticity and provided with female engaging elements on both the front and back surfaces, and a double-sided female surface fastener.

Background Art

[0002] As a general female surface fastener, there is known one in which loops as female engaging elements are formed on the surface of a flat base material woven with fiber yarns as warp and weft (Patent Document 1). The female engaging element engages with a hook-shaped or mushroom-shaped male engaging element provided on the male surface fastener, and the female surface fastener and the male surface fastener constitute a pair of surface fasteners. Also, there is known a female surface fastener having elasticity by knitting rubber strings into a flat base material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional techniques including the above patent documents, female engaging elements are provided only on the surface of the flat base material. Therefore, for example, when trying to wrap a belt-shaped surface fastener having elasticity around an object to restrain it, the user first has to find the surface provided with the female engaging elements and wrap the object with the surface exposed, which is a problem that the work is time-consuming.

[0005] The present invention aims to provide a method for manufacturing a double-sided female hook-and-loop fastener that is stretchable and has female-type engaging elements on both the front and back surfaces, and a double-sided female hook-and-loop fastener, taking into consideration the above-mentioned problems. [Means for solving the problem]

[0006] The present invention provides a method for manufacturing a double-sided female hook-and-loop fastener that is elastic and has female engagement elements on both the front and back surfaces of a flat base material, comprising at least the steps of: forming the flat base material by weaving a rubber cord into a plurality of weft threads while raising and lowering it up and down under tension in the warp direction; weaving the first warp threads into a plurality of weft threads while alternately raising and lowering the number of floating M and the number of floating N for each cycle; weaving the second warp threads, which are different from the first warp threads, into a plurality of weft threads while alternately raising and lowering the number of floating N and the number of floating N for each cycle; and releasing the tension so that the range of the first warp threads with the number of floating M becomes the female engagement element on the front surface, and the range of the second warp threads with the number of floating M becomes the female engagement element on the back surface. The location where the first warp thread intersects the flat substrate is offset in the warp direction by the number of weft threads, while the location where the second warp thread intersects the flat substrate is offset by the number of weft threads. It is characterized by the following: (M and N are positive integers, and M > N.) Furthermore, it is characterized by satisfying the following equations (1) and (2). 6 ≤ M ≤ 8 ···(1) N=2···(2)

[0007] The double-sided female hook-and-loop fastener of the present invention is a double-sided female hook-and-loop fastener that is elastic and has female engagement elements on both the front and back surfaces of a flat plate-shaped base material, wherein the flat plate-shaped base material is woven in the warp direction with elastic cords floating up and down with respect to multiple weft threads, the first warp thread is woven into the multiple weft threads with a floating number M alternating between sinking number N and floating number N for each sinking number M, the second warp thread different from the first warp thread is woven into the multiple weft threads with a sinking number M alternating between floating number N and sinking number N for each sinking number M, the range of the first warp thread with floating number M becomes the female engagement element on the front surface, and the range of the second warp thread with sinking number M becomes the female engagement element on the back surface. Furthermore, the location where the first warp thread intersects the flat substrate is offset in the warp direction by the number of weft threads, while the location where the second warp thread intersects the flat substrate is offset by the number of weft threads.It is characterized by the following: (M and N are positive integers, and M > N.) Furthermore, it is characterized by satisfying the following equations (1) and (2). 6 ≤ M ≤ 8 ···(1) N=2···(2) [Effects of the Invention]

[0008] In this invention, when the tension applied in the warp direction is released, the elastic cord returns to its original length, and the spacing between the multiple weft threads narrows. As a result, a range of several meters of floating first warp threads becomes a female-type engaging element (loop) on the surface side, and a range of several meters of submerged second warp threads becomes a female-type engaging element (loop) on the back side, thereby obtaining a double-sided female hook-and-loop fastener with elasticity. By shifting the point where the second warp thread intersects the flat base material by N weft threads (N=2) in the warp direction relative to the point where the first warp thread intersects the flat base material, it is possible to prevent the completed double-sided female hook-and-loop fastener from curling up. By keeping M and N within the range that satisfies equations (1) and (2), the warp threads will not fray, and the female-type engaging elements can be arranged evenly and aesthetically on both the front and back surfaces. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic cross-sectional view showing a double-sided female hook-and-loop fastener cut lengthwise. [Figure 2] Cross-sectional view showing the manufacturing method of a double-sided female hook-and-loop fastener. [Figure 3] Cross-sectional view showing the manufacturing method of a double-sided female hook-and-loop fastener. [Figure 4] Cross-sectional view showing the manufacturing method of a double-sided female hook-and-loop fastener. [Figure 5] A schematic cross-sectional view showing a double-sided female hook-and-loop fastener under tension in the longitudinal direction. [Modes for carrying out the invention]

[0010] Embodiments of the double-sided female hook-and-loop fastener and the method for manufacturing the double-sided female hook-and-loop fastener of the present invention will be described below. As shown in Figure 1, the double-sided female hook-and-loop fastener 1 is generally composed of a flat base material 10, a first warp thread 20, and a second warp thread 30, and female engagement elements 40 and 41 are provided on both the front and back surfaces of the flat base material 10. The flat base material 10 is formed by weaving a rubber cord 12 in the warp direction while causing it to float up and down against multiple weft threads 11 extending in the weft direction. The double-sided female hook-and-loop fastener 1 can be manufactured using the same automatic loom used for manufacturing general hook-and-loop fasteners, and the method of using such an automatic loom is well known, so a description will be omitted.

[0011] A more detailed explanation will follow, but the first warp thread 20 is woven into multiple weft threads 11 by alternating between floating number M (M=8 in this embodiment) and sinking number N (N=2 in this embodiment) and floating number N (N=2) for each floating number M (M=8 in this embodiment). However, M and N are positive integers, and M > N. The floating number refers to the number of warp threads that are floating relative to the weft threads 11 and are not constrained up to two intersections with weft threads 11 moving forward or backward in the warp direction; in other words, it refers to the number of weft threads 11 that lie between the two intersections of warp threads 11 moving forward or backward in the warp direction. The submerged number refers to the number of warp threads that are submerged relative to the weft threads 11 and are not constrained up to two intersections with weft threads 11 moving forward or backward in the warp direction; in other words, it refers to the number of weft threads 11 that lie between the two intersections of warp threads 11 moving forward or backward in the warp direction.

[0012] The second warp thread 30 is a different thread from the first warp thread 20, and is woven into multiple weft threads 11 while alternating between sinking number M (M=8) and floating number N (N=2) and sinking number N (N=2) for each sinking number. Of course, the double-sided female-type surface fastener 1 is not formed by only two warp threads, namely the first warp thread 20 and the second warp thread 30, but is formed by a large number of warp threads extending in the weft direction. The "first warp thread 20" and the "second warp thread 30" are for the sake of convenience in explaining the positional relationship in which the first warp thread 20 and the second warp thread 30 are woven with respect to a plurality of weft threads 11 when one of the large number of warp threads is designated as the "first warp thread 20" and the warp thread adjacent to the first warp thread 20 is designated as the "second warp thread 30".

[0013] The materials of the first warp thread 20, the second warp thread 30, and the weft thread 11 are not particularly limited, but it is preferable that they do not have elasticity. For example, synthetic resin materials such as nylon, rayon, acrylic, polyester, polyurethane, polyamide, and polypropylene may be used. Also, a monofilament or a multifilament in which a large number of thin fibrous filaments are formed into a single yarn may be used as the first warp thread 20, the second warp thread 30, and the weft thread 11. The material of the rubber cord 12 is not particularly limited as long as it has elasticity and can be woven into the weft thread 11.

[0014] Next, a method for manufacturing the double-sided female-type surface fastener 1 will be described. As shown in FIG. 2, while applying tension in the warp direction (refer to the arrow in the figure) using a well-known automatic loom, the rubber cord 12 is woven in the warp direction while being floated and sunk up and down with respect to a plurality of weft threads 11 to form the flat base material 10 (the first step). Since tension is applied in the warp direction, the interval D between the plurality of continuous weft threads 11 in the warp direction is expanded.

[0015] While performing the first step, as shown in Figure 3, the first warp thread 20 is woven into multiple weft threads 11 by alternating between floating number M (M=8) and sinking number N (N=2) and floating number N (N=2) (second step). In this embodiment, sinking number N (N=2) is performed three times and floating number N (N=2) is performed twice, and then floating number M (M=8) is performed again. In other words, for the first warp thread 20, floating number M once, sinking number N three times, and floating number N twice is considered one set, and this is repeated for 2, 3, 4 sets... until the desired length is reached. Furthermore, while performing the first and second steps, as shown in Figure 4, the sinking number M (M=8) is performed once for the second warp thread 30, and the floating number N (N=2) and sinking number N (N=2) are woven into the multiple weft threads 11 alternately (step 3). In this embodiment, the floating number N (N=2) is performed three times and the sinking number N (N=2) is performed twice, and then the floating number M (M=8) is performed again. In other words, for the second warp thread 30, one floating number M, three floating number N, and two sinking number N are considered as one set, and this is repeated for 2, 3, 4 sets... until the desired length is reached.

[0016] Figure 5 shows the state when steps 1 to 3 are performed simultaneously. At the point where the first warp thread 20 intersects the flat base material 10, the point where the second warp thread 30 intersects the flat base material 10 is shifted in the warp direction by the length of N weft threads 11 (N=2). Experiments have shown that by shifting the second warp thread 30 relative to the first warp thread 20 by the length of N weft threads 11 in this way, it is possible to prevent the completed double-sided female hook-and-loop fastener 1 from curling up. When the tension applied in the warp direction is released at an appropriate time, the elastic cord 12 returns to its original length as shown in Figure 1, and the spacing D between the multiple weft threads 11 becomes almost zero. As a result, a deflection occurs in the range of floating several M of the first warp thread 20, forming the female-type engaging element 40 (loop) on the surface side, and a deflection occurs in the range of submerged several M of the second warp thread 30, forming the female-type engaging element 41 (loop) on the back side. In this way, a double-sided female hook-and-loop fastener 1 is manufactured.

[0017] The range in the first warp 20 where the number of submerged threads N and the number of floating threads N are alternately repeated, and the range in the second warp 30 where the number of floating threads N and the number of submerged threads N are alternately repeated, are in close contact with the weft threads 11 and constitute a part of the base material. Since the first warp 20 and the second warp 30 are firmly fixed to the flat base material 10 by frictional force, even if a tensile force is applied to the first warp 20 and the second warp 30 when the engaged male and female engaging elements 40 and 41 are pulled apart, it is possible to prevent the first warp 20 and the second warp 30 from coming loose or fraying from the flat base material 10. Because the elastic cord 12 is woven in the vertical direction, the double-sided female hook-and-loop fastener 1 has elasticity in the warp direction. In this embodiment, the case where M=8 and N=2 was described, but it is particularly preferable that the following equations (1) and (2) are satisfied. 6 ≤ M ≤ 8 ···(1) N=2···(2) However, M≧9 and N≧3 are also acceptable. [Industrial applicability]

[0018] The present invention relates to a method for manufacturing a double-sided female hook-and-loop fastener that is stretchable and has female-type engaging elements on both the front and back surfaces, and to a double-sided female hook-and-loop fastener, which has industrial applicability. [Explanation of symbols]

[0019] D interval 1. Double-sided female hook-and-loop fastener 10 Flat base material 11 Weft 12 elastic cords 20 First warp 30 Second warp 40 Female-type engaging element 41 Female-type engaging element

Claims

1. A method for manufacturing a double-sided female hook-and-loop fastener that is stretchable and has female-type engaging elements on both the front and back surfaces of a flat base material, The process involves forming the flat base material by weaving a rubber cord into multiple weft threads in the warp direction while applying tension in the warp direction, and raising and lowering the rubber cord vertically. With respect to the first warp thread, the process involves weaving it into multiple weft threads while alternating between a floating number M and a sinking number N for each subsequent floating cycle. A step in which a second warp thread, different from the first warp thread, is woven into multiple weft threads while alternately performing a sinking number M and a floating number N for each subsequent sinking number, The system includes at least the step of releasing the tension such that the range of floating number M in the first warp threads becomes a female-type engaging element on the surface side, and the range of sinking number M in the second warp threads becomes a female-type engaging element on the back side. A method for manufacturing a double-sided female hook-and-loop fastener, characterized in that the location where the second warp thread intersects the flat plate-shaped substrate is offset in the warp direction by the number of weft threads relative to the location where the first warp thread intersects the flat plate-shaped substrate. (M and N are positive integers, and M > N.)

2. A method for manufacturing a double-sided female hook-and-loop fastener according to claim 1, characterized in that it satisfies the following formulas (1) and (2). 6 ≤ M ≤ 8 ... (1) N = 2 ... (2)

3. A double-sided female hook-and-loop fastener that is stretchable and has female-type engaging elements on both the front and back surfaces of a flat base material. The aforementioned flat substrate is formed by weaving rubber cords into multiple weft threads in the warp direction while they float up and down. The first warp thread is woven into multiple weft threads while alternately undergoing a floating number M and a sinking number N and a floating number N for each cycle. The second warp thread, which is different from the first warp thread, is woven into multiple weft threads while alternately performing a sinking number M and a floating number N for each sinking number M. The range of the first warp threads with a floating number M becomes the female-type engaging element on the surface side, and the range of the second warp threads with a sinking number M becomes the female-type engaging element on the back side. A double-sided female hook-and-loop fastener characterized in that, at the point where the first warp thread intersects the flat base material, the point where the second warp thread intersects the flat base material is offset in the warp direction by the number of weft threads. (M and N are positive integers, and M > N.)

4. The double-sided female hook-and-loop fastener according to claim 3, characterized in that it satisfies the following formulas (1) and (2). 6 ≤ M ≤ 8 ... (1) N = 2 ... (2)

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