JPWO2020100640A1 - Fabric hook-and-loop fastener with hook-shaped engaging element - Google Patents

Abstract

In a hook-and-loop fastener in which a plurality of hook-shaped engaging elements are present on the surface of the base cloth, the monofilament constituting the hook-shaped engaging element is a polybutylene terephthalate system containing 0.2 to 8% by mass of polyester elastomer. The hook-and-loop fastener made of polyester provides a woven hook-and-loop fastener in which the hook-shaped engaging element has excellent engaging strength and fibril resistance, is soft to the touch, and has excellent flexibility.

Description

According to the present invention, a woven hook-and-loop fastener having a hook-shaped engaging element, particularly a hook-shaped engaging element made of a monofilament having excellent flexibility, is unlikely to become fibrillated even if the hook-shaped engaging element is repeatedly engaged and disengaged. The present invention relates to a hook-and-loop fastener made of woven fabric, or a hook-and-loop mixed type woven hook-and-loop fastener having both such a hook-shaped engaging element and a loop-shaped engaging element on the same surface of the base fabric.

Conventionally, as a hook-and-loop fastener having a woven base cloth, a so-called hook-and-loop fastener having a plurality of hook-shaped engaging elements made of monofilament on the surface of the base cloth and a multifilament yarn capable of engaging with the hook-shaped engaging element have been used. A combination of so-called loop hook-and-loop fasteners having a plurality of loop-shaped engaging elements on the surface of the base fabric is widely used.

In the hook-and-loop fastener used for such a combination, a polyamide-based monofilament typified by nylon 6 is widely used as a hook-shaped engaging element. However, when a polyamide-based monofilament is used, there is a drawback that the hook-and-loop fastener undulates due to water absorption / moisture absorption and heat. In addition, when polyamide-based monofilaments are used, since the main fibers that make up today's clothing are polyester-based fibers, it is necessary to attach a hook-and-loop fastener after dyeing due to the difference in dyeability, and therefore the color tone of clothing. There is a problem that it is necessary to have a lot of hook-and-loop fasteners of different colors in stock.

As a hook-and-loop fastener that solves the drawbacks and problems of the hook-and-loop fastener made of a polyamide-based monofilament, a hook-and-loop fastener having a hook-shaped engaging element using a monofilament made of polyethylene terephthalate polyester has been proposed ( Patent Document 1).
When such a monofilament made of polyethylene terephthalate polyester is used for the hook-shaped engaging element, the above-mentioned drawbacks and problems can be solved, and further, since the monofilament is rigid, it is difficult to come off from the loop-shaped engaging element. As a result, there is also an advantage that a high engaging force can be obtained.

However, when a monofilament made of polyethylene terephthalate polyester is used as the hook-shaped engaging element, the hook-shaped engaging element is too rigid, so that the loop-shaped engaging element of the engaging partner is easily cut, which is further excessive. When a momentary load, that is, repeated impact peeling occurs due to the rigidity, the hook stretches and deforms, which causes a new problem that it is difficult to recover. Furthermore, it has a problem that it is not always suitable for supporters and clothing applications that require flexibility because it is too rigid to the touch.

As a hook-shaped engaging element that solves the above-mentioned problems of polyethylene terephthalate polyester, a hook-and-loop fastener using a monofilament made of polybutylene terephthalate polyester has been proposed (Patent Document 2). That is, since the monofilament made of polybutylene terephthalate polyester is far more flexible than polyethylene terephthalate polyester, it does not cut the loop-shaped engaging element of the engaging partner and it is easy to maintain the hook shape forever. Furthermore, even if the engaging element falls down, it is easy to stand up, and many loop fibers easily enter the hook, so high engaging force and excellent engaging durability can be obtained, and a monofilament made of polybutylene terephthalate polyester. Because it is flexible, it is soft to the touch and is suitable for applications in the field of direct contact with the skin, such as supporters and clothing applications.

Moreover, since polybutylene terephthalate polyester can be dyed in the same color at the same time as polyethylene terephthalate polyester under the same dyeing conditions, it can be dyed in the same color simply by attaching a colorless hook-and-loop fastener to clothing made of polyethylene terephthalate fiber before dyeing. It also solves the problem of having to have many color-colored hook-and-loop fasteners in stock due to differences in dyeability, such as polyamide-based hook-and-loop fasteners.

A hook-and-loop fastener having a hook-shaped engaging element composed of a monofilament made of polybutylene terephthalate polyester has excellent performance, but a hook using a monofilament made of polybutylene terephthalate polyester for the hook-shaped engaging element. When the hook-and-loop fastener is used for applications such as blood pressure monitors, supporters, artificial limbs, shoes, bags, toys, etc. where the number of times of repeated engagement and disengagement is extremely frequent, when the disengagement is repeated frequently, the hook-shaped engaging element part We have found that polybutylene terephthalate monofilaments gradually undergo fibrillation.

As the monofilament becomes fibril, a crevice occurs parallel to the length direction of one monofilament, and the rigidity required for the hook-shaped engaging element is lost, making it difficult to engage with the loop-shaped engaging element. As the height increases, the monofilament is finely divided, making it difficult for the hook-shaped engaging element to maintain the hook shape, and the engaging strength decreases. When the fibrillation is further promoted, the fibrillated hook-shaped engaging element itself is cut and disappears.

For example, sphygmomanometers installed in hospitals and homes for the elderly use hook-and-loop fasteners as cuffs, and hook-and-loop fasteners with hook-shaped engaging elements made of monofilament made of polybutylene terephthalate polyester are soft to the touch. Although it is preferable in terms of flexibility, in the case of such a frequently used sphygmomanometer, the hook-shaped engaging element made of a monofilament made of polybutylene terephthalate polyester is fibrillated after repeated engagement and disengagement. As the engagement strength decreases, the fibrils are gradually cut off, and finally the hook-shaped engagement element itself disappears, and the function as a sphygmomanometer is lost.

The monofilament used for the hook-shaped engaging element is usually subjected to a high-magnification drawing process in order to increase the tensile strength in the manufacturing process, whereby the crystals forming the monofilament are aligned in the length direction of the monofilament. Therefore, it is considered that the cause of fibrillation is that it is easy to tear in the length direction due to this.

Japanese Unexamined Patent Publication No. 2013-244139 Japanese Unexamined Patent Publication No. 2014-27988

The present invention has a new problem of a woven hook-and-loop fastener having a hook-shaped engaging element composed of a monofilament made of a polybutylene terephthalate polyester having such excellent performance, that is, a hook-shaped engaging element. When the forming monofilament is repeatedly engaged and disengaged, the monofilament becomes fibrillated and a crevice is formed in the length direction of the monofilament, and as the monofilament further progresses, one monofilament is torn into small pieces and hook-and-loop. The purpose of the coupling element is to solve the problem that it becomes difficult to maintain the hook shape and the engagement strength is lost.

That is, in the present invention, in a hook-and-loop fastener in which a plurality of hook-shaped engaging elements are present on the surface of the base cloth, the monofilament constituting the hook-shaped engaging element is a polyester elastomer having a weight of 0.2 to 8% by mass. It is a hook-and-loop fastener characterized by being made of polybutylene terephthalate polyester containing.

Then, preferably, in such a hook-and-loop fastener, the base cloth is a woven fabric composed of a warp, a weft and a monofilament for a hook-shaped engaging element, and both the warp and the weft are polyethylene terephthalate multifilament yarns. The weft has heat-sealing property, the monofilament for the hook-shaped engaging element is woven in the fabric in parallel with the warp, and the hook-shaped engaging element is the hook-shaped engaging element. The element monofilament is formed at a position where a plurality of the warp threads are straddled, and the root of the hook-shaped engaging element is fixed to the base fabric by fusion with the weft threads.

More preferably, in such a hook-and-loop fastener, the base cloth has a plain weave structure, and the monofilament for the hook-shaped engaging element is woven into the woven base cloth for every four warp threads in parallel with the warp threads. After floating and sinking the five wefts, one leg of the loop formed at the straddling the three warp threads and the one weft thread is cut to form the hook-shaped engaging element. If this is the case. Further, preferably, in such a hook-and-loop fastener, the monofilament for the hook-shaped engaging element is a monofilament having a diameter of 0.1 to 0.23 mm.

Further, in the present invention, in such a hook-and-loop fastener, a part of the monofilament for the hook-shaped engaging element is replaced with a polybutylene terephthalate multifilament yarn for the loop-shaped engaging element, and the multifilament yarn is replaced with the warp yarn. The loop is woven into the fabric in parallel, a loop is formed at a position straddling one weft without straddling the warp, and a loop-shaped engaging element is formed without cutting one leg of the loop. The shape engaging element and the hook shape engaging element are provided on the surface of the base cloth.

In the present invention, polybutylene terephthalate polyester containing 0.2 to 8% by mass of polyester elastomer is used as the monofilament constituting the hook-shaped engaging element. By blending the polyester elastomer in the monofilament in this way, it is possible to prevent the monofilament of the hook portion from becoming fibril even if the hook-shaped engaging element is frequently engaged and disengaged. As a result, it is possible to prevent the engagement strength from being lowered.

The monofilament made of polybutylene terephthalate-based polyester blended with polyester elastomer, which constitutes the hook-shaped engaging element of the present invention, is a so-called mixture in which the polyester elastomer chips are blended when the polybutylene terephthalate-based polyester chips are melt-spun. Obtained by spinning. In general, it is known that when mixed spinning is performed, peeling is likely to occur at the interface between the two polymers in the obtained fiber, and the physical characteristics of the fiber are deteriorated and fibrilization is likely to occur. On the contrary, fibrillation is suppressed.

Although polybutylene terephthalate polyester and polyester elastomer differ greatly in physical properties such as expansion and contraction behavior, polyester elastomer suppresses fibrillation rather than increasing fibrillation of monofilament made of polybutylene terephthalate polyester. The fact that it has the effect of

Moreover, the monofilament made of polybutylene terephthalate polyester blended with polyester elastomer is the same as the monofilament made of unblended polybutylene terephthalate polyester alone in terms of dyeability, and the presence of the polyester elastomer is the presence of polybutylene terephthalate polyester. It does not impair the excellent dyeability of the monofilament made of.

It is a photograph which shows the state of the hook-shaped engaging element when the hook-shaped engaging element of the hook-and-loop fastener of this invention is repeatedly engaged and disengaged. It is a photograph which shows the state of the hook-shaped engaging element when the engagement and disengagement of the surface fastener of the prior art are repeated frequently.

Hereinafter, the present invention will be described in detail.
First, the hook-and-loop fastener targeted in the present invention is a hook-shaped engaging element made of a monofilament on the surface of a base cloth, that is, a monofilament is formed into a loop shape and heat is applied to fix the loop shape, and then one leg of the loop is cut. multiple engagement elements that loop to a hook shape by, preferably a large number (about 30 ^/ cm 2 to 120 pieces / cm ²⁾ existing set of surface fastener.

The base fabric is preferably a woven fabric woven from warp threads, weft threads, and a monofilament for a hook-shaped engaging element. Particularly preferably, both the warp and the weft are multifilament yarns, the wefts have heat-sealing properties, and the monofilament for the hook-shaped engaging element is woven in the fabric in parallel with the warp, and the hook-like engagement is performed. The combined element is formed at a position where a monofilament for a hook-shaped engaging element straddles a plurality of warp threads, and the root of the hook-shaped engaging element is fixed to the base fabric by fusion with the weft threads.
In the present invention, the heat-sealing property is a property of being softened by heating, and more specifically, when the heat-sealing fiber is heated to a certain temperature or higher, it is softened and comes into close contact with the fiber. It means that it can be fused with fibers made of the same material or different materials.

The warp yarn does not undulate due to heat, water absorption, and moisture absorption (a state in which the base cloth surface of the hook-and-loop fastener moves up and down irregularly and does not become a horizontal surface), and further improves the heat fusion property of the weft yarn. , A multifilament yarn substantially composed of a polymer of polyethylene terephthalate polyester is preferable. Multifilament yarns formed from polyethylene terephthalate homopolymers are more preferred.

The thickness of the multifilament yarn used as the warp is preferably a multifilament yarn having a total decitex of 20 to 54 filaments of 100 to 300 decitex, and particularly a total decitex of 24 to 48 filaments of 150 to 300 decitex. A multifilament yarn of 250 decitex is preferred.

In the hook-and-loop fastener of the present invention, it is preferable that the weft yarn contains a heat-sealing multifilament yarn. A preferable typical example of the heat-sealing multifilament yarn is a multifilament yarn in which core-sheath type heat-sealing filaments having a sheath component as a heat-sealing component are focused.

Since the weft contains a heat-sealing multifilament yarn, the monofilament for the engaging element can be firmly fixed to the base fabric, and the monofilament for the engaging element can be firmly fixed to the base fabric like a conventional hook-and-loop fastener. It is no longer necessary to apply a polyurethane or acrylic backcoat resin to the back surface of the hook-and-loop fastener base cloth to prevent it from being pulled out, which simplifies the process and further, the back surface of the base cloth is not hardened with the back coat resin. Therefore, the flexibility and breathability of the hook-and-loop fastener are not hindered. Further, the presence of the backcoat resin layer does not cause a problem of deterioration of dyeability of the surface fastener.

The core-sheath type heat-sealing multifilament yarn described above is made of a polyester-based resin in which the sheath component is melted under heat treatment conditions and the root of the monofilament for a hook-shaped engaging element can be firmly fixed to the base fabric. A preferable example is a multifilament yarn in which a plurality of core-sheath type filaments made of a polyester resin whose components do not melt under heat treatment conditions are focused.

Specifically, polyethylene terephthalate is used as a core component, and a large amount of a copolymerization component typified by isophthalic acid or adipic acid is copolymerized, for example, 20 to 30 mol%, thereby significantly lowering the melting point or softening point. A typical example is a core-sheath polyester-based multifilament yarn containing a copolymerized polyethylene terephthalate as a sheath component. The melting point or softening point of the sheath component is preferably 100 to 200 ° C., and is preferably 20 to 150 ° C. lower than the melting point of the warp, the core component, or the monofilament for the hook-shaped engaging element. The cross-sectional shape of the core-sheath type heat-sealing fiber may be a concentric core sheath, an eccentric core sheath, a single core core sheath, or a multi-core core sheath.

Further, it is preferable that all of the multifilament yarns constituting the weft yarn are the heat-sealing multifilament yarns because the monofilament for the hook-shaped engaging element is firmly fixed to the base fabric. When the multifilament yarn constituting the weft is not formed in the core-sheath cross-sectional shape and the entire cross section is formed of the heat-sealing polymer, the heat-sealing polymer melted and solidified again becomes brittle and easily cracked. When sewn, the base cloth is easily torn from the sewing thread portion. Therefore, the heat-sealing multifilament yarn preferably contains a resin that is not heat-sealed, and preferably has a cross-sectional shape of the core sheath. The mass ratio of the core component to the sheath component is preferably in the range of 50:50 to 80:20, particularly preferably in the range of 55:45 to 75:25.

The weft is preferably a multifilament yarn, and the thickness of the multifilament yarn constituting the weft is preferably a multifilament yarn having a total decitex of 80 to 300 decitex consisting of 10 to 72 filaments, particularly 18 to 36 yarns. A multifilament yarn having a total decitex of 90 to 200 decitex is preferable.

What is important in the present invention is that the resin forming the monofilament for the hook-shaped engaging element is a polybutylene terephthalate polyester blended with 0.2 to 8% by mass of a polyester elastomer.
A monofilament made of polybutylene terephthalate blended with a polyester elastomer can be easily obtained by so-called mixed spinning in which a polyester elastomer chip is blended with a polybutylene terephthalate chip and spun at the time of spinning as described above.

By blending 0.2-8% by mass of polyester elastomer, even if peeling is repeated frequently, compared with the case of monofilament composed of polybutylene terephthalate alone (that is, polybutylene terephthalate in which polyester elastomer is not blended). Therefore, fibrillation is much less likely to occur. The blend of 0.2 to 8% by mass of the polyester elastomer referred to in the present invention is a value with respect to the mass of the polybutylene terephthalate polyester. Of course, if the amount of resin other than polybutylene terephthalate and polyester elastomer is small, it may be blended as another component within a range that does not impair the performance, and further, various stabilizers, colorants, etc. may be used as other components. It may be added as long as the performance is not impaired. The total mass of the two components, polybutylene terephthalate and polyester elastomer, is 80% by mass or more with respect to the mass of polybutylene terephthalate-based polyester ("polybutylene terephthalate" + "polyester elastomer" + "other optional components"). Is more preferable, and 90% by mass or more is more preferable, and 100% by mass (only two components of polybutylene terephthalate and polyester elastomer) is particularly preferable.

When the resin to be blended is not a polyester elastomer but another elastomer such as a polyurethane-based, polyolefin-based or polystyrene-based elastomer, improvement in fibril resistance cannot be obtained, but rather, engagement / peeling is frequently performed. By repeating this, fibrillation is promoted. Therefore, it is an effect peculiar to polyester elastomer.

In the present invention, the polyester elastomer blended into the monofilament constituting the hook-shaped engaging element is preferably a resin obtained by copolymerizing polyoxytetramethylene glycol with a resin having a butylene terephthalate unit as a main repeating unit, and is elastic. Despite the high rate, it is preferable that the resin has sufficient properties of an elastic polymer. In the present invention, the proportion of the [poly (oxytetramethylene)] terephthalate group in the polyester elastomer is preferably in the range of 40 to 70% by mass, more preferably 50 to 60% by mass.

When the blending amount of the polyester elastomer is less than 0.2% by mass with respect to the polybutylene terephthalate-based polyester, the effect of blending the polyester elastomer is hardly exhibited. If the blend amount exceeds 8% by mass, the monofilament becomes too soft and the hook shape opens with a low force, so that high engagement strength cannot be obtained. The polyester elastomer is preferably blended in an amount of 0.5 to 5% by mass, more preferably 0.5 to 3% by mass, and even more preferably 1 to 3% by mass.

FIG. 1 shows the hook-like engaging element formed from a monofilament made of polybutylene terephthalate blended with 2% by mass of polyester elastomer, and FIG. 2 shows polybutylene terephthalate alone without polyester elastomer blended. It is a micrograph of the hook-shaped engaging element at the time when the hook-shaped engaging element is formed from the monofilament and is repeatedly engaged and disengaged 20,000 times, respectively.
The hook-shaped engaging element of FIG. 1 is not found to be fibrillated or has a rift in the monofilament length direction, which is a precursor of fibrillation, whereas the hook-shaped engaging element of FIG. 2 is not found. It can be seen that the roots are whitened by fibrillation, the monofilament has crevices in the length direction, and there are fine fibrillated fibers separated and independent from the monofilament by fibrillation.

The polybutylene terephthalate polyester constituting a monofilament is a resin obtained from terephthalic acid and butanediol, and if the amount is small, other copolymerization components are copolymerized within a range that does not impair the performance of polybutylene terephthalate. May be good. The ratio of the other copolymerization component is preferably 20% by mass or less, more preferably 10% by mass or less, still more preferably 5% by mass or less, and 0. It is particularly preferably mass%.

The thickness of the monofilament for the hook-shaped engaging element is preferably 0.10 to 0.23 mm in diameter from the viewpoint of achieving both strong engagement and a flexible feel, and more preferably 0.14 to 0.20 mm in diameter.

A woven fabric for a hook-and-loop fastener is woven from the warp, weft and monofilament for a hook-shaped engaging element described above. As the woven structure of the woven fabric, a plain weave in which the monofilament for the hook-shaped engaging element is used as a part of the warp is preferable, and the monofilament for the hook-shaped engaging element exists parallel to the warp and is formed from the base cloth surface in the middle of the structure. A woven structure in which a loop for a hook-shaped engaging element is formed at a position where it rises and straddles a plurality of warp threads is preferable.

The weaving density of the warp threads is preferably 50 to 90 threads / cm after the heat treatment, and the weaving density of the weft threads is preferably 15 to 25 threads / cm after the heat treatment. The mass ratio of the weft yarn is preferably 10 to 45% with respect to the total mass of the loop-shaped engaging element yarn, the warp yarn, and the weft yarn constituting the hook-and-loop fastener.

The number of driven monofilaments for the hook-shaped engaging element is preferably about 3 to 6 for 20 warp threads (including the monofilament for the hook-shaped engaging element). Particularly preferably, the ratio of one monofilament for the hook-shaped engaging element to five warp threads (including the monofilament for the hook-shaped engaging element) is such that the monofilament for the hook-shaped engaging element is not biased with respect to the warp. It is preferable to drive evenly. Therefore, it is preferable that the hook-shaped engaging element monofilaments are present on both sides of the continuous four warp threads on average.

In particular, in the present invention, the monofilament for the hook-shaped engaging element is woven into the fabric base fabric for every four warp threads in parallel with the warp threads, and five weft threads are floated up and down on the weft threads, and the three warp threads and the weft thread 1 are floated. It is preferable to form a loop for the hook-shaped engaging element at a position straddling the book because both the engaging strength and the peeling durability can be satisfied. Then, the loop-formed monofilament is preferably woven so that five weft threads float and sink and float on the weft threads to form a loop across three warp threads and one weft thread and return to the original warp threads.

The surface fastener woven fabric thus obtained is then heat-treated to melt the sheath component of the core-sheath type heat-sealing multifilament yarn constituting the weft. This eliminates the need for backcoating, which has been performed with conventional hook-and-loop fasteners, and deteriorates the work environment due to the evaporation of the organic solvent used in the backcoat resin liquid, and the backcoat resin liquid adheres to the manufacturing equipment. Further, it is possible to prevent the problem that the flexibility and breathability of the hook-and-loop fastener are impaired by the backcoat resin, and the problem that the presence of the backcoat resin hinders the dyeability of the hook-and-loop fastener.

As the temperature during the heat treatment, 150 to 220 ° C., which is a temperature at which the sheath component of the heat-sealing multifilament yarn melts or softens but the other monofilaments, yarns and core components do not melt, is generally used. More preferably, it is in the range of 185 to 210 ° C. Further, the shape of the hook-shaped engaging element loop is fixed by the heat during this heat treatment, and the hook shape is maintained even if one leg of the loop is cut.

^{Then, a hook-and-loop fastener fabric having a plurality of, preferably a large number (about 30 pieces / cm 2 to} 120 pieces / cm ² ) of loops for hook-shaped engaging elements having a fixed shape in this way is used, and then a hook is used. Cut one leg of the loop to complete the hook-shaped engaging element. Cutting of one leg is usually performed by a hair clipper or the like.
When cutting one leg, the part slightly deviated from the center of the loop to the side of one leg is cut, that is, the height from the base cloth surface to the top of the loop is set to 1. The fact that the loop is cut at a position close to the top of 2/3 or more and slightly deviated from the top makes the monofilament for the hook-shaped engaging element more fibrillated by frequent engagement and peeling. It is preferable to prevent it to a high degree.

The density of the hook-shaped engaging elements in the hook-and-loop fastener thus obtained is preferably ^{25 to 125 pieces / cm 2 based on the base cloth portion in which the engaging elements are present.} The height of the hook-shaped engaging element is preferably 1.0 to 2.5 mm from the base cloth surface.

The case of the hook-and-loop fastener has been described in detail above, but in the present invention, in addition to the hook-and-loop fastener in which only the hook-shaped engaging element exists on the surface of the base cloth, the hook-shaped engaging element is present on the surface of the hook-and-loop fastener. It is also effective in the case of a so-called hook-loop mixed type surface fastener in which the loop-shaped engaging elements are mixed.

At that time, the loop-shaped engaging element includes a multifilament yarn in which the multifilament yarn constituting the so-called loop portion, which is easily engaged with the hook-shaped engaging element, is easily divided into individual filaments (easily separated). It is preferably used. In particular, the multifilament yarn is formed of polybutylene terephthalate polyester which is particularly easily divided (easily separated) and has excellent flexibility, and does not melt at the temperature at which the heat-sealing multifilament yarn is heat-fused. It is preferable that a multifilament yarn is used.
As the thickness of the multifilament yarn for the loop-shaped engaging element, a multifilament yarn in which 5 to 12 filaments of 32 to 45 dtex are focused is preferable.

Then, it is preferable that the multifilament yarn for the loop-shaped engaging element is woven in parallel with the warp yarn, and a loop is formed on the woven fabric every time five weft yarns float and sink. The total number of multifilament threads for the loop-shaped engaging element is 20 warp threads (monofilament for the hook-shaped engaging element and loop-shaped engaging) in total of the monofilament for the hook-shaped engaging element and the multifilament thread for the loop-shaped engaging element. 3 to 6 threads are preferable with respect to (including multifilament threads for elements), and the number of driven monofilaments for hook-shaped engaging elements and multifilament threads for loop-shaped engaging elements is in the range of 30:70 to 70:30. Is preferable. Then, it is particularly preferable that rows in which a plurality of hook-shaped engaging elements are arranged in the warp direction and rows in which a plurality of loop-shaped engaging elements are arranged are alternately present on the surface of the woven fabric in units of two rows.

In the case of a hook-loop mixed type surface fastener, only one leg side of the hook-shaped engaging element loop protruding from the surface of the heat-treated surface fastener fabric is cut to form a hook-shaped engaging element. .. The cutting position is the same as in the case of the hook-and-loop fastener described above.

The height of the hook-shaped engaging element is preferably 1.5 to 2.5 mm from the base cloth surface and 0.3 to 0.8 mm lower than the height of the loop-shaped engaging element. Since the polyester elastomer is blended with the polybutylene terephthalate polyester that constitutes the engaging element, it has excellent flexibility and texture, but this effect is higher in the loop-shaped engaging element than in the hook-shaped engaging element. This makes it even more prominent.

The density of each of the hook-shaped engaging element and the loop-shaped engaging element in the hook-loop mixed type surface fastener is 20 to 40 pieces / cm ² , 20 to 20 based on the base cloth portion in which the engaging element is present. 40 pieces / cm ² is preferable. The ratio of the number of hook-shaped engaging elements to the number of loop-shaped engaging elements is preferably in the range of 40:60 to 60:40.

Then, in the case of the hook-loop mixed type surface fastener, the surface of the loop-shaped engaging element is rubbed with a needle cloth or the like to divide the multifilament yarn constituting the loop-shaped engaging element into individual filaments (separation). Is preferable in order to increase the engagement strength. When the height of the loop-shaped engaging element is higher than the height of the hook-shaped engaging element, the top of the hook-shaped engaging element is not easily damaged even if it is rubbed with a needle cloth or the like, and the engaging strength is not impaired.

The hook-and-loop fastener of the present invention and the hook-loop mixed type hook-and-loop fastener can be used in the fields of application in which conventional general surface fasteners are used, but in particular, applications in which engagement and disengagement are frequently and repeatedly performed. Suitable for, for example, sphygmomanometers (especially sphygmomanometers used in hospitals and nursing homes), shoes, bags, hats, gloves, etc., as well as clothing, supporters, artificial limb fixing materials, packing band, binding. It can be used in a wide range of fields such as tapes, various toys, fixing of civil engineering and construction sheets, storage boxes and packing cases that can be assembled and disassembled, and small items. In particular, it is suitable for applications that come into direct contact with the skin of the human body and that are frequently engaged and disengaged, for example, the above-mentioned blood pressure monitor, supporter, and fixation of artificial limbs.

Hereinafter, the present invention will be described with reference to Examples. In the examples, the initial engagement strength was measured according to the method of JIS L3416: 2000, and the peeling durability was also measured according to JIS L3416: 2000. When the hook-and-loop fastener is a hook-and-loop fastener as the engagement partner at that time, a textile-based loop surface fastener brand part number B10000 manufactured by Clarefasning Co., Ltd. ^{having an element density of 60 pieces / cm 2 of the loop-shaped engaging element is used.} In the case of the hook-loop mixed type surface fastener (manufactured by Clarefasning Co., Ltd .: hook-loop mixed type surface fastener F9820Y.12), the same hook-loop mixed type surface fastener was used.

(Example 1)
The following threads were prepared as warp threads, weft threads, and monofilaments for hook-shaped engaging elements that constitute the base fabric of the hook-and-loop fastener.
[Warp]
・ Multifilament yarn made of polyethylene terephthalate with a melting point of 260 ° C ・ Total decitex and number of filaments: 30 at 167 dtex

[Weft (multifilament yarn consisting of core-sheath composite filament)]
-Core component: polyethylene terephthalate (melting point: 260 ° C)
-Sheath component: 25 mol% isophthalic acid copolymerized polyethylene terephthalate (softening point: 190 ° C)
-Core-sheath ratio (mass ratio): 70:30 (core component: sheath component)
・ Total decitex and number of filaments: 24 at 110 dtex

[Monofilament for hook-shaped engaging element]
-A polybutylene terephthalate polyester monofilament (melting point: 223 ° C.) blended with 2% by mass of a polyester elastomer (Toray DuPont polyester elastomer: Hytrel 7247), and the above elastomer is chip-blended during spinning.
・ Fineness: 200 decitex (diameter: 0.14 mm)

[Manufacturing hook-and-loop fasteners]
Using the above warp, weft and monofilament for hook-shaped engaging element, plain weave is used as the weaving structure, and the weaving density is 60 warp / cm (including monofilament for hook-shaped engaging element) and 20 weft / cm. Weaved like this. At that time, a monofilament for a hook-shaped engaging element is driven in parallel with the warp at a ratio of one to four warp threads, five weft threads are floated and sunk, and then a loop is formed at a position straddling one weft thread and three warp threads. I made it. Then, the loop-formed monofilament was woven so as to float and sink five weft threads, then float on the weft threads, form a loop across the three warp threads and one weft thread, and return to the original warp threads.

The hook-and-loop fastener tape woven by the above method has a temperature at which only the sheath component of the weft is heat-melted and the warp, the monofilament for the hook-shaped engaging element, and the core component of the weft are not heat-melted. Heat treatment was performed at ° C. As a result, the sheath component was melted and the yarn existing in the vicinity was fused to the core component of the weft. Then, one leg of the loop for the hook-shaped engaging element was cut at a height of 4/5 from the bottom of the height of the hook-shaped engaging element, and the loop was made into a hook-shaped engaging element. The density of the hook-shaped engaging element of the obtained hook-shaped engaging element was 60 pieces / cm ² , and the height of the hook-shaped engaging element from the base cloth surface was 1.8 mm.

As a result of the initial engagement strength of the obtained hook hook-and-loop fastener and the engagement strength after repeating engagement / peeling 20,000 times, a hook-shaped engaging element is formed when the engagement / peeling is repeated 20,000 times. Whether or not the monofilament to be fibrillated was observed by magnifying the hook-shaped engaging element with a microscope. The results are shown in Table 1 below. Further, FIG. 1 shows a micrograph of the monofilament constituting the hook-shaped engaging element at the time of repeating 20,000 times.

As is clear from the results in Table 1, the hook-and-loop fastener of this embodiment has excellent initial engagement strength, engagement strength after repeating engagement / peeling 20,000 times, and engagement / peeling 20,000 times. It can be seen that the fibril resistance at the time of repeating is extremely excellent. Further, from FIG. 1, it can be seen that the monofilament is not fibrillated at all even after 20,000 times of engagement and disengagement.

(Examples 2 to 3 and Comparative Examples 1 to 3)
As the monofilament for the hook-shaped engaging element used in Example 1, the blend amount of the polyester elastomer was 0.5% by mass (Example 2), 5% by mass (Example 3), and 0% by mass (Comparative Example 1). ), 0.1% by mass (Comparative Example 2), and 10% by mass (Comparative Example 3), a hook-and-loop fastener was produced by the same method as in Example 1. However, in the hook-and-loop fastener blended with 10% polyester elastomer (Comparative Example 3), a state in which the cut surface of the hook was torn off was observed. This is probably because the hook thread was cut while being stretched. FIG. 2 shows a micrograph of the hook-shaped engaging element at the time when the hook-and-loop fastener of Comparative Example 1 was repeatedly engaged and disengaged 20,000 times.

The results of the initial engagement strength of these obtained loop surface fasteners and the peeling durability after 20,000 times engagement / peeling are also shown in Table 1 below.

From Table 1 above, when the blend amount of the polyester elastomer is within the range specified in the present invention, the initial engagement strength is excellent, and the engagement strength at the time of repeating engagement and peeling 20,000 times is excellent. The monofilament forming the hook-shaped engaging element is not fibrillated even after repeated joining and peeling, whereas when the blend amount is less than the range specified in the present invention, fibrillation occurs, and as a result, fibrillation occurs. If the engagement and disengagement are repeated, the engagement strength is reduced, and if the blend amount exceeds the amount specified in the present invention, the hook-shaped engaging element can be easily opened by a light tensile force. From this, it can be seen that high engagement strength has not been obtained.

Further, the hook-and-loop fastener of the present invention is soft to the touch and has excellent flexibility because the hook-shaped engaging element is made of a flexible polybutylene terephthalate-based monofilament yarn, and is extremely suitable for applications in which it comes into direct contact with the human body. In addition, it was possible to have the same color as the fibers made of ordinary polyethylene terephthalate polyester in terms of dyeability.

(Example 4, Comparative Example 4)
In the first embodiment, the monofilament for the hook-shaped engaging element is changed from the monofilament having a diameter of 0.14 mm to the monofilament having a diameter of 0.2 mm, and the monofilament for the hook-shaped engaging element is changed into the following loop shape in units of two. Instead of the multifilament thread for the engaging element, there are two rows of loop-shaped engaging element loop rows next to the two rows of hook-shaped engaging element rows on the surface of the hook-and-loop fastener, and for the loop-shaped engaging element. The multifilament thread for the loop-shaped engaging element is performed in the same manner as in the first embodiment except that it straddles one weft thread without straddling the warp thread at the place where the loop is formed, and is used for the hook-loop mixed type hook-and-loop fastener. A woven fabric was produced (Example 4).

Further, in the fourth embodiment, as the monofilament for the hook-shaped engaging element, a polybutylene terephthalate monofilament having a thickness of 0.20 mm, which is not blended with polyester elastomer at all, is used to prepare a woven fabric for a hook-loop mixed type surface fastener. It was prepared (Comparative Example 4).

[Multifilament thread for loop-shaped engaging element]
-Multifilament yarn made of polybutylene terephthalate (melting point: 220 ° C)
・ Total decitex and number of filaments: 7 at 265 dtex

The obtained two types of woven fabrics were heat-treated in the same manner as in Example 1, and the legs closer to the center of the two rows of hook-shaped engaging element loops were cut to form the loops as hook-shaped engaging elements. .. The loop-shaped engaging element density and the hook-shaped engaging element density of the obtained hook-loop mixed type surface fastener are 30 pieces / cm ² and 30 pieces / cm ² , respectively, and the height of the loop-shaped engaging element is 2. The height of the hook-shaped engaging element was 2.5 mm, and the height was 2.0 mm.

Table 2 below shows the results of the initial engagement strength of the obtained two types of hook-loop mixed type surface fasteners and the engagement strength at the time when engagement / peeling was repeated 20,000 times. Further, the degree of fibrilization of the monofilament of the hook-shaped engaging element at the time of repeating engagement and disengagement 20,000 times was observed with a microscope. The results are shown in Table 2 below.

From Table 2, the hook-loop mixed type surface fastener in which the blend amount of the polyester elastomer is within the range specified in the present invention has an initial engagement strength and an engagement strength at the time of repeating engagement and peeling 20,000 times. Both are excellent, and the monofilament forming the hook-shaped engaging element does not cause fibrillation even after repeated engagement and disengagement (Example 4), whereas the polyester elastomer is not blended (comparison). In Example 4), it can be seen that fibrillation occurs, and as a result, the engagement strength decreases as the engagement and disengagement are repeated.
Further, the hook-loop mixed type hook-and-loop fastener of the fourth embodiment is soft to the touch and excellent in flexibility because the hook-shaped engaging element is made of a flexible polybutylene terephthalate type monofilament, and is particularly used for direct contact with the human body. It was extremely suitable for.

Claims (5)

In a hook-and-loop fastener in which a plurality of hook-shaped engaging elements are present on the surface of the base cloth,
A hook-and-loop fastener characterized in that the monofilament constituting the hook-shaped engaging element is made of polybutylene terephthalate polyester containing 0.2 to 8% by mass of a polyester elastomer. The base fabric is a woven fabric made of a warp, a weft, and a monofilament for a hook-shaped engaging element, and both the warp and the weft are polyethylene terephthalate multifilament yarns.
The weft has heat-sealing properties and is
The hook-shaped engaging element monofilament is woven in the fabric in parallel with the warp, and the hook-shaped engaging element is formed at a position where the hook-shaped engaging element monofilament straddles a plurality of the warp. The hook-and-loop fastener according to claim 1, wherein the root of the hook-shaped engaging element is fixed to the base cloth by fusion with the weft. The base cloth has a plain weave structure
The monofilament for the hook-shaped engaging element is woven into the fabric base fabric for each of the four warp threads in parallel with the warp threads, and after the five weft threads are floated and sunk, the three warp threads and the one weft thread are combined. The hook-and-loop fastener according to claim 2, wherein one leg of the loop formed at the straddling portion is cut off to form the hook-shaped engaging element. The hook-and-loop fastener according to any one of claims 1 to 3, wherein the monofilament for a hook-shaped engaging element is a monofilament having a diameter of 0.10 to 0.23 mm. A part of the monofilament for the hook-shaped engaging element is replaced with a polybutylene terephthalate multifilament yarn for the loop-shaped engaging element, and the multifilament yarn is woven into the fabric in parallel with the warp yarn without straddling the warp yarn. A loop is formed at a position straddling the one weft thread, and a loop-shaped engaging element is formed without cutting one leg of the loop, and the loop-shaped engaging element and the hook-shaped engaging element are formed. The hook-and-loop fastener according to any one of claims 1 to 4, which is mixed on the surface of the base cloth.

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