TWI612192B - Female part of hook and loop fastener - Google Patents

Abstract

The invention discloses a female joint portion of a hook-and-loop hook-and-loop fastener tape, which includes a base material and a knitted fabric composed of warp, weft and loop yarns, wherein the warp, weft and loop yarns are interwoven to form intertwined points , And the warp yarns forming the interlaced points travel in a direction opposite to the direction of the loop yarns forming the interlaced points and the weft yarns forming the interlaced points. The female joint portion of the hook and loop hook and loop fastener tape exhibits excellent joint force with a male joint portion, and the difference between the left and right joint forces is small.

Description

Hook and loop female buckle

The present invention relates to a female joint portion of a hook and loop hook and loop fastener, a hook and loop hook and loop fastener with the same and an absorbent article having the hook and loop hook and loop fastener.

Hook-and-loop hook and loop fasteners are widely used for fastening floor materials; opening / closing applications of garments, etc., because of simplifying the attaching / detaching operation, and also for bonding of absorbent articles such as diapers. A hook and loop hook and loop fastener is composed of a male joint and a female joint. In particular, a loop constituting the female contact portion is held in place by engaging with a hook constituting the male contact portion. In the prior art, an attempt has been made to develop a female connector having sufficient joint force with a male connector.

US Patent No. 6,096,667 describes a weft inserted warp knitted fabric used as a mother fabric in a hook and loop hook and loop fastener, which includes a weft inserted warp knitted fabric having a front surface and a back surface, The back surface of the fabric has a plurality of spaced apart knitting loops, and an overlap portion of each of the knitting loops protrudes outward from the back surface to form a free yarn connected at only its base to one of its respective warp loops Loops, in which adjacent yarn loops in each warp loop are alternately inclined laterally in opposite directions and a weft yarn is inserted into the weft loops of the fabric between the front and back sides of the fabric and extends across the full width of the fabric.

Japanese Unexamined Patent Application Publication No. 2004-236960A describes a mother material piece for a hook and loop hook and loop fastener, which has a structure in which the mother material piece is bonded to a substrate surface via a warp knitted fabric The warp knitted fabric has a loop formed to receive a hook, wherein the warp knitted composition is as follows: a loop pile pile stitching portion and a corrugated stitching portion by passing a yarn combed through an intermediate guide yarn Joining and joining with the corrugated stitching portion by passing the yarn combed through a rear guide yarn so that the direction of the adjacent loop pile in the knitting direction alternates left and right; and the base stitching portion by passing through a front yarn guide The carded yarns are respectively joined to the corrugated stitching portion or the loop pile pile stitching portion.

WO 2010-030548 describes a female joint portion of a hook-and-loop hook and loop fastener, which includes a base material and a knitted fabric composed of warp, weft and loop yarns, wherein a structure of the warp yarns is alternately arranged with open nodes and One of the closed nodes is a chain seam. The loop yarn is fixed to only the closed node of the warp yarn through the open node of the loop yarn, and the loop yarn protrudes from only one surface of the knitted fabric to the left and right along the warp knitting direction.

The invention discloses a female joint portion of a hook and loop hook and loop fastener, which includes a base material and a knitted fabric composed of warp yarns, weft yarns and loop yarns, wherein the warp yarns, weft yarns and loop yarns are warped to form intertwined points. And the warp yarn forming the interlaced point travels in a direction opposite to the direction of the loop yarn forming the interlaced point and the weft yarn forming the interlaced point. The female joint portion of the hook and loop hook and loop fastener tape exhibits excellent joint force with a male joint portion, and the difference between the left and right joint forces is small.

According to the present invention, the female joint portion of the hook-and-loop hook and loop fastener belt may adopt a structure in which the loop yarn protrudes from one side of the knitted fabric alternately with respect to the warp yarn. In addition, during the manufacture of the female part of a hook-and-loop hook and loop fastener (knitted fabric) or even after a certain period of time has elapsed, "post-leakage" does not easily occur in the female part of a hook-and-loop hook and loop fastener. In the protruding loop yarn (that is, the pile of loop yarn formed on one side of the knitted fabric constituting the female joint portion of a hook and loop hook and loop fastener is formed on the opposite side of the knitted fabric). Therefore, the female joint of a hook-and-loop hook and loop fastener obtained according to the present invention has excellent joint force to engage with a male joint, and the difference between the left and right joint forces is small. In addition, the tear strength of the female joint portion of a hook and loop hook and loop fastener can be improved by applying a knitted pattern to the female joint portion of a hook and loop hook and loop fastener of the present invention. In addition, the female part of a hook and loop fastener according to the present invention is easy to produce and can be utilized as a female part of a hook and loop fastener in an absorbent article such as a paper diaper.

Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention. However, the female connection portion of the hook and loop hook and loop fastener according to one of the present invention is not limited to the following embodiments.

As shown schematically in FIG. 1, a female joint portion 10 of a hook and loop hook and loop fastener according to the present invention has a warp yarn 21 (not shown), a weft yarn 22 (not shown), and a loop yarn 23. A knitted fabric 20 and a substrate 30. In a knitted fabric 20, the loop yarn 23 forms a pile in the knitted fabric 20, and the warp yarn 21 and the weft yarn 22 form a base stitching portion 25 of the knitted fabric 20, wherein the loop yarn 23 is self-knitted with respect to the warp yarn 21 in the left-right direction. One of the 20 surfaces protrudes alternately.

FIG. 2A is a schematic diagram showing a knitting pattern of the knitted fabric 20 having the structure shown in FIG. 1, FIG. 3A is a schematic diagram showing a state of one of the knitting patterns of FIG. 2A, and FIG. 3B is a view showing decomposition into warp yarns 21 ( (B)), FIG. 3B, weft yarn 22 ((c) in FIG. 3B) and loop yarn 23 ((a) in FIG. 3B). As shown in FIGS. 2A and 3A, the warp yarns 21, weft yarns 22, and loop yarns 23 of the knitted fabric 20 are interlaced to form interlaced points 24 (24a, 24b, 24c). Here, the warp yarn 21 forming the interweaving point 24 travels in a direction opposite to the direction of the loop yarn 23 forming the interweaving point 24 and the weft yarn 22 forming the interweaving point 24. A structure is obtained by having such a knitting pattern (see FIG. 2B), in which the loop yarn 23 protrudes from one surface of the knitted fabric 20 to the left and the right alternately with respect to the warp yarn 21. It can also be a structure to prevent "back leakage" of loop yarns, as described above.

One knitted pattern of the knitted fabric 20 will be described below with reference to FIGS. 3A and 3B. However, the knitting pattern of the knitted fabric 20 is not limited to the pattern shown in FIGS. 3A and 3B.

First, the warp yarn 21 is formed into a 0-1 / 1-0 / 1-0 / 0-1 pattern by repeating the chain stitching, and the warp yarn 21 forms a base stitching portion 25 (intermediate guide comb) of the knitted fabric 20.

Next, the loop yarn 23 is guided to the left and right with respect to the warp yarn 21 to form a pile (front comb) of the knitted fabric 20. First, the loop yarn 23 is wound from right to left at a predetermined stitch position of the knitted fabric 20 through a closed node or an open node and is guided to the left. Next, the left-feed loop yarn 23 is reversely wound to join the open node 21a of the warp yarn 21 (that is, the loop yarn becomes a closed node), thereby forming the interlaced point 24a. Therefore, the warp yarn 21 forming the interlaced dot 24a travels in a direction opposite to the direction of the loop yarn 23 forming the interlaced dot 24a. Then, the loop yarn 23 is further guided to the left of the knitted fabric 20. Then, the loop yarn 23 is wound from left to right at a predetermined stitch position of the knitted fabric 20 through a closed node or an open node. Next, the right-feed loop yarn 23 is reversely wound to join the open node 21b of the warp yarn 21 (that is, the loop yarn becomes a closed node), thereby forming the interlaced point 24b. As described above, the warp yarn 21 forming the interlaced dot 24b also travels in a direction opposite to the direction of the loop yarn 23 forming the interlaced dot 24b. This system is repeated so that the loop yarn 23 protrudes from one surface of the knitted fabric 20 to the left and the right alternately with respect to the warp yarn 21 to form a pile.

As shown in FIG. 2B, the expression "the loop yarn protrudes from only one surface of the knitted fabric to the left and right alternately with respect to the warp yarn" here means: In the knitted fabric 20, when viewed in a direction perpendicular to the warp yarn 21 In one cross section, the loop yarn 23 is alternately formed to the left and right, while maintaining a constant angle with respect to the surface of the base stitching portion 25 and the point where the warp yarn is joined as the origin. Therefore, even if the loop yarn system is formed to the left and right with respect to the warp yarn, the loop yarn (that is, the loop yarn on the surface) formed to be substantially parallel to the surface of the base stitching portion is not included.

In FIGS. 3A and 3B, the pattern of the loop yarn 23 is repeatedly represented by one of 6-5 / 11-10 / 5-6 / 0-1 (open nodes on the left and right ends). Other pattern examples include 6-5 / 10-11 / 5-6 / 1-0 (when the left and right ends form a closed node in the form of Figure 3A), 5-4 / 9-8 / 4-5 / 0- 1 (the left and right ends are open nodes in the form of FIG. 6) and 5-4 / 8-9 / 4-5 / 1-0 (when the left and right ends of the form in FIG. 6 form closed nodes).

Next, the weft yarn 22 coupled with the warp yarn 21 forms a base stitching portion 25 (back comb) of the knitted fabric 20. In FIGS. 3A and 3B, the weft yarn 22 is lined into the chain seam of the warp yarn 21 as a stitch line in the pattern 4-3 / 7-7 / 3-4 / 0-0. In addition to the pattern shown in Fig. 3A, the stitching can also, for example, be lined with a pattern 7-6 / 13-13 / 6-7 / 0-0 (the pattern of Fig. 6) or 3-2 / 5- 5 / 2-3 / 0-0. The weft yarn 22 is warped in reverse to join the open node of the warp yarn 21 in the interweaving point 24a (ie, the weft yarn forms a closed node), and like the loop yarn, the warp yarn 21 forming the interweaving point 24a and The weft yarn 22 travels in one direction. In the state of FIGS. 2, 3A, and 3B, the weft yarn 22 is woven into the structure at the open node of the warp yarn 21, and the weft yarn 22 changes its direction to the left and right at the closed node of the warp yarn 21 ′ adjacent to the warp yarn 21. to.

In this way, the warp 21, weft 22, and loop 23 of the female portion 10 of a hook and loop hook and loop fastener are knitted together to form the intertwined point 24, and the warp 21 that forms the intertwined point 24 forms the intertwined point 24 The loop yarn 23 and the weft yarn 22 forming the interweaving point 24 travel in opposite directions.

As can be clearly understood from FIGS. 3A and 3B, the knitted fabric 20 has a structure in which the warp yarns 21 have alternate interlaced points 24 and intersections between the warp and weft yarns. In addition, as described above, the loop yarn 23 protrudes from one surface of the knitted fabric 20 to the left and right with respect to the warp yarn 21 alternately. In consideration of joining force, the angle of the protruding loop yarn 23 with respect to the knitted fabric 20 is preferably 30 ° or more (relative to the surface of the knitted fabric), and may be 45 ° or more in a certain aspect. In addition, the upper boundary of the protruding angle is not particularly limited, and the angle of the protruding loop yarn 23 with respect to the surface of the knitted fabric 20 may be 80 ° or even 90 °.

Here, the knitting pattern may be defined by marking a specific form of one of the nodes of the warp 21, weft 22, and loop 23 in three consecutive interlaced points 24 (ie, open nodes or closed nodes). In other words, the form of the nodes of the warp 21, weft 22, and loop 23 in three consecutive interlaced points 24 along the warp knitting direction constitutes the smallest unit 26 that defines the knitting pattern of the knitted fabric 20. In addition, as shown in FIGS. 2A and 3A, the interlaced points 24 (24a, 24b, and 24c) and the nodes (closed nodes, non-interlaced points) of the warp yarns alternate along the warp yarns. Therefore, the knitted fabric shown in FIGS. 2A and 3A includes three interlaced points along the warp knitting direction and two warp yarn nodes (closed nodes) as the minimum unit for defining the knitting pattern.

In order to effectively form loop piles and obtain a structure that reduces the risk of "back leakage", the warp 21, weft 22, and loop 23 in three consecutive interweaving points 24 each preferably have the knitting pattern shown in Table 1. . In Table 1, O represents an open node and C represents a closed node. For example, "C-C-C" indicates that the form of the node in three consecutive interleaving points is closed node / closed node / closed node.

Among the above-mentioned patterns, one of the patterns 1 to 18 is preferably a knitting pattern in one aspect. In order to reduce the risk of "back leakage", the knitting pattern is more preferably one of the patterns 1 to 9, and most preferably one of the patterns 1 to 3.

The knitting machine for knitting the knitted fabric 20 is not particularly limited, and any knitting machine having three or four cards can be used widely without modification. Therefore, the female joint portion of the hook and loop hook and loop fastener according to the present invention is easy to produce at low cost.

The materials of the warp 21, weft 22, and loop 23 of the knitted fabric 20 are not particularly limited and may include polypropylene, polyester, polyethylene, polyamide, polyurethane, rayon, copolymer, or Their mixtures and natural fibers, etc. In one aspect, high-strength polyamine can be used for self-prevention of the female connector due to the damage caused by the joint with a male connector. Considering material cost and environmental stability, polyester can be used. As a loop yarn, a multifilament yarn is better than a monofilament yarn to increase the possibility of joining with a male joint. In this case, because the filaments of a loop of yarn are sometimes broken during the engagement with the male joint, the appropriate diameter of a loop of yarn should be selected based on the shape of the hook and loop hook and loop tape and the like. As for the warp and weft yarns, both monofilament yarns and multifilament yarns can be used. Generally speaking, the yarn density is 20 T to 220 T, and more preferably 20 T to 100 T.

In one aspect, the knitted fabric 20 may have a basis weight of 10 grams per square meter to 100 grams per square meter. If the basis weight is 5 grams per square meter or less, the shape of the knitted fabric is difficult to maintain during knitting, and if the basis weight is 100 grams per square meter or more, the rigidity increases such that when the knitted fabric adheres to an absorbent The article may impair the flexibility in this part. Also, knitted fabrics can become too dense, and visibility can be compromised when designing the substrate from an aesthetic perspective. Since the female joint portion 10 of the hook-and-loop hook and loop fastener of the present invention has excellent joint force for engaging with a male joint portion and the difference between the left and right joint forces is small, the base can be reduced compared to conventional products. weight. Therefore, a female part of a hook and loop hook and loop fastener with excellent visibility can be produced at low cost.

Additional processing, such as fuzzing, embossing, printing, dyeing, coloring, and the like, may be performed on the female portion 10 of a hook and loop fastener. The knitted fabric 20 may be dyed in whole or in part. Especially when used as a member of an absorbent article such as a diaper, gloss (such as gloss, glitter, etc.) can be reduced and an extremely beautiful appearance can be obtained.

The material of the substrate 30 is not particularly limited, and a resin film, a nonwoven fabric, paper, or a laminate thereof can be used. Examples of the resin film include, for example, synthetic resin films of polypropylene, polyethylene, polystyrene, polyethylene terephthalate, and other polyester resins, polyamide resins, and polyurethane resins, Or a laminate of these synthetic resin films. In one aspect, a position indicator or various marks or designs on a surface where a male portion is joined may be provided on the surface of the substrate.

The base material 30 is bonded to the knitted fabric 20 on a surface opposite to the surface from which the loop yarn 23 alternately protrudes to the left and right. The method for joining the base material 30 to the knitted fabric 20 is not particularly limited. Any conventional method can be used, such as dry lamination, extrusion lamination, wet lamination, thermal lamination, ultrasonic method. Among them, a dry layer method is preferable in consideration of productivity, flexibility, and visibility of a position indicator or the like provided on the substrate layer. Urethane-based adhesives, EVA-based adhesives, acrylate adhesives, vinyl acetate-based adhesives, or the like can be used as one of the adhesives for dry lamination. One of the adhesives based on starch, casein, vinyl acetate, polyacrylate or the like can be used as one of the adhesives for wet lamination. Resins such as polyethylene, polypropylene or modified polyolefins are suitable for extrusion lamination. The adhesive or resin is not limited to the materials mentioned above.

In the case of dry lamination, an adhesive layer may be disposed on one surface of the substrate (over the entire surface) or may be disposed partially. When the adhesive layer is partially provided, the application method is not particularly limited. Generally speaking, an adhesive is applied in a pattern, and there is no particular limitation on the applied pattern, shape, size, and the like. Any pattern, shape, or size can be used, such as circular, oval, rectangular, polygonal, and so on. When an adhesive part is applied on the surface of the substrate, the number of loop yarns that are lowered due to the leakage of the adhesive through the knitted fabric can be reduced, so that the joint force can be avoided when engaging with the hooks constituting the male joint. One decreases. The bonding force can be changed by appropriately selecting the shape of the applied pattern and the amount of the adhesive.

As shown in FIG. 4, the female connection portion 10 of a hook and loop hook and loop fastener according to the present invention can be used to form a hook and loop hook and loop fastener 50 by being engaged with a male connection portion 40. Here, the loop yarn 23 (fleece) provided on the knitted fabric 20 constituting the female connection portion 10 of a hook and loop hook and loop fastener is hooked on the hook 41 constituting the male connection portion 40 so that the female connection portion 10 and the male connection The part 40 is joined and the female part and the male part are attached to each other. In the hook-and-loop hook and loop fastener 50 having the female-joint portion 10 of the hook-and-loop hook-and-loop fastener according to the present invention, the female-junction portion is structured such that the loop yarn 23 is opposed to the warp yarn 21 from one surface of the knitted fabric 20 It protrudes to the left and right alternately and there is almost no risk of "back leakage" of the loop yarn, so the difference in left and right joining force tends to be suppressed when joining with the male joint.

Here, the difference between the left and right joining forces can be evaluated by the following operations: joining a female portion of a hook and loop fastener with a male portion; for a plurality of points, with respect to the width direction (that is, the CD direction) , Perpendicular to the direction of warp knitting), measure the bonding force (right bonding force) when peeling both from right to left and the bonding force (left bonding force) when peeling both from left to right; and obtain from {( The average value of the measured right engagement force)-(the average value of the measured left engagement force)} / (the average value of all the measured values of the right engagement force and the left engagement force) is the absolute value of the calculation result. Therefore, the closer the obtained value is to zero, the smaller the difference between the left and right joining forces.

The male joint can be of any type as long as a satisfactory joint force can be obtained. For example, a male joint having a mushroom-shaped hook, a key-shaped hook, or a J-shaped hook may be used. The pin density of the male connector is not specifically regulated, but is generally in the range of 500 to 5000 bucks per square inch, and in one aspect, 1600 bucks per square inch can be used. One of the buckles is one of the male density of the buckle density. Like the yarn constituting the female joint, the material of the male joint may be selected from polypropylene, polyester, polyethylene, polyamide, copolymer, or a mixture thereof. The thickness of the base material portion of the male portion can be appropriately set. In particular, one of the hook straps purchased from Sumitomo 3M (CS-600) or the like can be used.

The hook and loop hook and loop fastener of the present invention can be used as a buckle of a floor material or a wall material, a buckle of a garment, a buckle of a cleaning component, or a buckle of an automobile interior material. It can also be used as a buckle for one of absorbent articles (such as paper diapers, sanitary napkins, breastfeeding pads, etc.). When hook-and-loop hook and loop fasteners are used in an absorbent article (especially a paper diaper), the joint characteristics of the female and male joints should be considered, especially the performance of the female joint. In ordinary paper diapers, a pair of male joints are provided on both sides of the wearer's back, and a pair of female joints are provided on the left and right sides of the abdominal precursor. Therefore, the paper diaper has a male joint part and a female joint part which are respectively joined at two positions, left and right. If the difference between the left and right joining forces (that is, the difference between the force required for peeling to the left and right directions) is large, the wearer will depend on the reliability of the fastening function of the paper diaper provided by the hook and loop hook and loop fastener. Feeling uneasy. The female joint of the present invention is preferable because it can reduce the difference in the left and right joining force with the male joint.

When the female joint of a hook-and-loop hook and loop fastener of the present invention is used in a hook-and-loop hook and loop fastener of an absorbent article, the method of fastening to the absorbent article may include: by, for example, gluing , Thermal fusion or ultrasonic bonding; one-piece molding; mechanical fastening, such as sewing and nailing, etc. For fastening by gluing, known adhesives can be appropriately selected according to needs, such as rubber-based adhesives (such as SIS and SBS), acrylic-based adhesives, silicone-based adhesives, and EVA-based adhesives. And the like, but the adhesive is not limited to these resins.

Examples

Examples of the present invention will be described in more detail below. It should be understood that the invention is not limited to these examples.

Example 1

One or three card knitting machines (made by KARL MAYER) are used to produce loop yarns (6-5 / 11-10 / 5-6 / 0-1), warp yarns (0-1 / 1-0 / 1-0 / 0-1) and one of the knitting patterns of one of the weft yarns (4-3 / 7-7 / 3-4 / 0-0). The materials used for loop yarn, warp yarn and weft yarn are: loop yarn: polyester (84T, 36 thread); warp yarn: polyester (22T, 1 thread); weft yarn: polyester (56T, 24 thread). Knitting conditions are 1-in-2-out, weft loops: 8 per cm, warp loops: 3.7 per cm, and the basis weight of one knitted fabric is 23 grams per square meter.

Therefore, the obtained knitted fabric was dry-laminated to a 12-micron-thick biaxially oriented polypropylene substrate to obtain a female joint portion of a hook-and-loop fastener with polypropylene adhesive. Respectively, the knitted pattern (texture) of the knitted fabric of the female joint portion of the hook and loop hook and loop fastener obtained as a result is schematically shown in FIG. 2A, and the knitted fabric pattern is schematically shown in FIG. 3A. FIG. 2B is a schematic view showing the state of the loop yarns (one left and right yarn loops) formed in the knitted fabric when the knitted fabric is cut along line A-A (a direction perpendicular to a warp knitting direction) of FIG. 2A. The adhesive is obtained by mixing a polyurethane main component (trade name: TAKELAC A969v, manufactured by Mitsui Chemical Polyurethane) with an isocyanate curing agent (trade name: TAKENATE A5, manufactured by Mitsui Chemical Polyurethane) and then mixing The mixture was formulated by adding it to silicon dioxide (trade name: TOKUSIL U, manufactured by Tokuyama Corporation) (wherein the solid content of the silicon dioxide is 7% by weight of the total weight of the adhesive). Specifically, a polyurethane main component and an isocyanate curing agent are added to a solvent containing stirred silicon dioxide, and after further stirring, a dry laminator made by FUJI SEIKI is used to make The mixture was laminated at 150 meters per minute. The amount of adhesive applied was about 5 grams per square meter.

Example 2

As in Example 1, a three-comb knitting machine (manufactured by KARL MAYER) was used to produce loop yarns (5-4 / 9-8 / 4-5 / 0-1) and warp yarns (0-1 / 1-0 / 1-0 / 0-1) and one of the weft yarns (7-6 / 13-13 / 6-7 / 0-0) is a warp knitted pile knitted fabric. The materials used for loop yarn, warp yarn and weft yarn are: loop yarn: polyester (56T, 24 threads); warp yarn: polyester (22T, 1 threads); weft yarn: polyester (22T, 1 threads). Knitting conditions are 1 in and 2 out, weft loops: 8 per cm, warp loops: 3.7 per cm, and the basis weight of one knitted fabric is 14 grams per square meter. As in Example 1, the obtained knitted fabric was used to obtain a female joint portion of a hook and loop hook and loop fastener. Respectively, the knitted pattern (texture) of the knitted fabric of the female joint portion of the hook-and-loop hook and loop fastener thus obtained is shown schematically in FIG. 5A, and the knitted fabric pattern is shown schematically in FIG. 6. FIG. 5B is a schematic view showing a state of a loop yarn (one loop on each side) formed in the knitted fabric when the knitted fabric is cut along the line B-B (direction perpendicular to the warp knitting direction) of FIG. 5A.

Example 3

One or three card knitting machines (made by KARL MAYER) are used to produce loop yarns (6-5 / 11-10 / 5-6 / 0-1), warp yarns (0-1 / 1-0 / 1-0 / 0-1) and one of the knitting patterns of one of the weft yarns (4-3 / 7-7 / 3-4 / 0-0). The materials used for loop yarn, warp yarn and weft yarn are: loop yarn: polyester (56T, 24 threads); warp yarn: polyester (22T, 1 threads); weft yarn: polyester (22T, 1 threads). Knitting conditions are 1 in and 2 out, weft loops: 8 per cm, warp loops: 3.7 per cm, and the basis weight of one knitted fabric is 12 grams per square meter. As in Example 1, the obtained knitted fabric was used to obtain a female joint portion of a hook and loop hook and loop fastener. Therefore, the knitting pattern of the knitted fabric of the female joint portion of the hook and loop fastener and the state of the loop yarn formed in the knitted fabric are the same as those of Example 1.

Example 4

One or three card knitting machines (made by KARL MAYER) are used to produce loop yarns (6-5 / 11-10 / 5-6 / 0-1), warp yarns (0-1 / 1-0 / 1-0 / 0-1) and one of the knitting patterns of one of the weft yarns (3-2 / 5-5 / 2-3 / 0-0). The materials used for loop yarn, warp yarn and weft yarn are: loop yarn: polyester (56T, 24 threads); warp yarn: polyester (22T, 1 threads); weft yarn: polyester (22T, 1 threads). Knitting conditions are 1 in and 1 out, weft loops: 8 per cm, warp loops: 5.5 per cm, and the basis weight of one knitted fabric is 25 grams per square meter. As in Example 1, the obtained knitted fabric was used to obtain a female joint portion of a hook and loop hook and loop fastener. Separately, the knitted pattern (texture) of the knitted fabric of the female joint portion of one hook and loop hook and loop fastener thus obtained is schematically shown in FIG. 7A, and the knitted fabric pattern is schematically shown in FIG. 8. FIG. 7B is a schematic view showing a state of a loop yarn (one loop on each side) formed in the knitted fabric when the knitted fabric is cut along line C-C (a direction perpendicular to one of the warp knitting directions) of FIG. 7A.

Comparative Example 1

A three-comb knitting machine (manufactured by KARL MAYER) is used to produce the loop yarn (3-2 / 5-4), warp yarn (1-0 / 0-1), and weft yarn (0-0 / 5-5). A warp knitted fleece knitted fabric. The materials used for loop yarn, warp yarn and weft yarn are: loop yarn: polyamide (44T, 11 threads); warp yarn: polyamide (22T, 1 threads); weft yarn: polyamide (22T, 1 threads). Knitting conditions are 1 in and 1 out, weft loops: 10.4 per cm, warp loops: 5.5 per cm, and the basis weight of one knitted fabric is 21 grams per square meter. As in Example 1, the obtained knitted fabric was used to obtain a female joint portion of a hook and loop hook and loop fastener. FIG. 9 is a schematic view showing a state of a loop yarn (one loop on each side) formed in the knitted fabric when the knitted fabric is cut in a direction perpendicular to the warp knitting direction of the knitted fabric.

Evaluation of a female part of a hook and loop fastener Joint force

A 25mm wide male connector (CS-600, manufactured by Sumitomo 3M Co., Ltd.) is placed on the female connector of a hook and loop hook and loop fastener obtained in the above examples and comparative examples and pressed against a 2 kg roller put them together. Next, the female part and the male part are pulled horizontally with a force of 1 kg to cause the two parts to engage with each other. At a stretching rate of 300 mm per minute, a male and female joint of a hook and loop fastener is stretched in the vertical direction, and the peel force at the time of peeling is measured to obtain the joint force (newtons per 25 millimeters) ). The engagement of the peeling hook and the loop hook and loop fastener from the male part by right-to-left (right engaging force) or left-to-right (left engaging force) with respect to the width direction (that is, the CD direction, perpendicular to the warp knitting direction) The joints measure the joint force (six times each). The bonding force was obtained by averaging 12 measured values. The results are shown in Table 2.

Direction of bonding force

Use the equation {(average of six measured right engagement forces)-(average of six measured left engagement forces)} / (average of all (twelve) measured right and left engagement forces) The result is expressed as an absolute value. As described above, the direction of the engaging force is obtained from each of the six measured values of the right engaging force and the left engaging force. The closer the value is to zero, the smaller the difference between the left and right joining forces. The results are shown in Table 2.

Stratified strength

The knitted fabric and the base material of the female joint of a hook and loop fastener are combined with each other via an adhesive, and then set between 25 mm chucks and stretched vertically at a rate of 300 mm per minute. Stretch and measure the force at which the knitted fabric is separated from the substrate by using a tensile tester to obtain the delamination force (newtons per 25 mm). The results are shown in Table 2.

Tear strength (longitudinal direction)

As shown in FIG. 10, the obtained female joint portion of a hook and loop hook and loop fastener is cut to about 100 mm (MD) x 50 mm (CD), and a blade is cut at a substantial center of the CD direction by a 20 A millimeter-depth cut 70 produces a test sample 60 (test sample A). The same method was used to generate another test sample (Test Sample B). As shown in FIGS. 11A and 11B, the end portions 61a and 61b on the side of the test sample A having the cutout 70 are fastened to a tensile tester set at a distance of 20 mm between the chucks 80 so that Test sample A was stretched by 100 mm at a rate of 300 mm per minute, and the change in strength of test sample A was measured. The highest strength value obtained is designated as the tear strength of Test Sample A. Set test sample B in one of the tearing directions opposite to the direction of test sample A (the end portion 61b is fastened to an upper chuck 80 and the end portion 61a is fixed to the lower chuck 80), and the test is measured under the same conditions as above Tear strength of sample B. The tear strength of the test samples A and B was averaged to obtain the tear strength of the female joint portion of a hook and loop fastener. The results are shown in Table 2.

The highlight of the loop yarn

Visually observe the protruding state of the loop yarn on the female joint of a hook and loop hook and loop fastener. The condition that the yarns protruding to the left and right and the yarn loops on the left and right sides have the same size is judged as "good", and the yarns protruding to the left and right have the same size but the yarn loops on the left and right sides are not equal One condition of the size was judged as "acceptable", and one condition of the loop yarn not protruding to the left and right was judged as "unacceptable". The results are shown in Table 2.

"Post-leak" in loop yarn

Prepare a 100mm × 100mm female joint of one of the hook and loop hook-and-loop fastener samples, and visually observe the degree of "back leakage" of the loop yarn. A "post-leakage" of 5% or less was judged to be "excellent", 5% to 10% was judged to be "good", and 10% to 30% was judged to be "acceptable". The results are shown in Table 2.

10． ． ． Female connector

20. ． ． Knitted fabric

twenty one. ． ． Warp

21a. ． ． Open node

21b. ． ． Open node

twenty one'. ． ． Warp

twenty two. ． ． Weft

twenty three. ． ． Loop yarn

twenty four. ． ． Interlaced points

24a. ． ． Interlaced points

24b. ． ． Interlaced points

24c. ． ． Interlaced points

25. ． ． Basal suture

26. ． ． Minimum unit

30. ． ． Substrate

40. ． ． Public Department

41. ． ． hook

50. ． ． Hook and loop hook and loop

60. ． ． testing sample

61a. ． ． Ends

61b. ． ． Ends

70. ． ． incision

80. ． ． Chuck

1 is a schematic diagram showing a cross-sectional structure of a female joint portion of a hook and loop hook and loop fastener according to an embodiment of the present invention;

2A is a schematic view showing a knitting pattern of a knitted fabric in a female joint portion of a hook and loop hook and loop fastener according to an embodiment of the present invention (Examples 1 and 3);

2B is a schematic view showing a state of a loop yarn (one loop on each side) observed when the knitted fabric is cut along the line A-A (vertical to the warp knitting direction) of FIG. 2A;

3A is a schematic diagram showing a pattern showing one aspect of the knitting pattern of the knitted fabric shown in FIG. 2A;

FIG. 3B is a schematic diagram showing the pattern of the knitted texture of the knitted fabric shown in FIG. 3A broken into warp, weft and loop yarns, which shows (a) loop yarn, (b) warp yarn and (c) weft yarn;

4 is a schematic diagram showing a cross-sectional structure of a hook and loop hook and loop fastener according to an embodiment of the present invention;

5A is a schematic diagram showing a knitting pattern of a knitted fabric in a female joint of a hook and loop hook and loop fastener according to an embodiment (Example 2) of the present invention;

5B is a schematic view showing a state of a loop yarn (one loop on each side) observed when the knitted fabric is cut along line B-B (vertical to the warp knitting direction) of FIG. 5A;

6 is a schematic diagram showing a pattern showing one aspect of a knitting pattern of the knitted fabric shown in FIG. 5A;

7A is a schematic diagram showing a knitted pattern of a knitted fabric of a female joint of a hook and loop hook and loop fastener according to an embodiment (Example 4) of the present invention;

7B is a schematic view of the state of the loop yarn (one loop on each side) observed when the knitted fabric is cut along the line C-C (vertical to the warp knitting direction) of FIG. 7A;

8 is a schematic diagram showing a pattern showing one aspect of a knitting pattern of the knitted fabric shown in FIG. 7A;

9 is a schematic view showing a state of a loop yarn formed on a surface of a knitted fabric of a hook-and-loop hook-and-loop fastener of a comparative example 1;

10 is a schematic diagram of a test sample used for measuring tear strength;

FIG. 11A is a front view of one of the methods of fastening a test sample used for measuring tear strength to a tensile tester and its pulling direction; and

FIG. 11B is a side view of one of the methods of fastening a test sample used for measuring tear strength to a tensile tester and its pulling direction.

10． ． ． Female connector

20. ． ． Knitted fabric

twenty three. ． ． Loop yarn

25. ． ． Basal suture

30. ． ． Substrate

Claims (3)

A female joint portion of a hook and loop hook and loop fastener includes: a base material and a knitted fabric composed of warp yarns, weft yarns and loop yarns, wherein the warp yarns, weft yarns and loop yarns are warped to form intertwined points, and The warp yarn forming the interweaving point travels in a direction opposite to the direction of the loop yarn forming the interweaving point and the weft yarn forming the interweaving point, and the loop yarn passes from the knitted fabric in a left-right direction with respect to the warp yarn. One surface protrudes alternately. A hook-and-loop hook-and-loop fastening tape includes a female connector and a male connector as in claim 1. An absorbent article comprising a hook and loop hook and loop fastener according to claim 2.