JP7439115B2 - flame retardant loop hook and loop fastener - Google Patents

Description

The present invention relates to a flame-retardant loop fastener, and in particular, it has excellent flame retardancy and high engagement force, and is also resistant to peeling off the engagement even when left under high temperature and high humidity conditions for a long period of time. The present invention relates to a textile-based flame-retardant loop fastener whose loop-shaped engaging elements are extremely unlikely to be pulled out from the textile base fabric.

Conventionally, as hook-and-loop fasteners having a textile base fabric made of cloth, hook-and-loop fasteners have hook-shaped engaging elements made of monofilament yarn on the surface of the textile base fabric, and multifilament yarns that can engage with the hook-shaped engaging elements. Combinations of loop hook-and-loop fasteners having loop-shaped engaging elements on the surface of a textile base fabric are widely used.

In recent years, hook-and-loop fasteners have been widely used as a means for fixing parts, structural materials, and heat insulating materials such as walls, ceiling materials, and floor materials inside vehicles such as automobiles, trains, ships, and airplanes. Flame retardancy is required in all of these application fields, and various flame-retardant hook-and-loop fasteners have been proposed to meet these requirements.

Among hook and loop fasteners, hook and loop fasteners are relatively easy to use because they are flame-retardant molded hook and loop fasteners manufactured by extrusion or injection molding of flame-retardant resin, rather than fabric-based hook and loop fasteners. Flame-retardant hook hook and loop fasteners can be easily produced, but for loop hook and loop fasteners, extrusion molding or injection molding cannot produce loop-shaped engaging elements with high engagement force, so textile-based loop hook and loop fasteners cannot be manufactured using extrusion molding or injection molding. It is necessary to manufacture products that satisfy flame retardancy.

In response to these demands, several proposals have been made so far regarding loop fasteners that satisfy the flame retardancy of textiles.
For example, Patent Documents 1 to 3 propose flame-retardant surface fasteners made of warp, weft, and loop-shaped engagement element threads. The warp, weft, and loop-shaped engagement element yarn all contain polyphenylene sulfide-based multifilament yarn. The flame-retardant hook and loop fastener is a woven loop hook and loop fastener that has a polyphenylene sulfide loop engaging element on the surface of a woven base fabric. As the weft, a polyphenylene sulfide multifilament yarn with a heat-fusible multifilament yarn added thereto is used. By melting this heat-fusible multifilament yarn, the base of the loop-shaped engagement element is fixed to the textile base fabric.

In recent years, there has been a demand for textile-based loop fasteners with superior flame retardancy, and the textile-based loop fasteners described in these known patent documents do not satisfy the required high degree of flame retardancy. I can't.

Specifically, Patent Document 1 describes that a multifilament yarn of 100 to 400 decitex consisting of 10 to 40 filaments is preferable as the polyphenylene sulfide multifilament yarn forming the loop-shaped engagement element. In this example, a multifilament yarn having a total thickness of 167 dtex and consisting of 10 polyphenylene sulfide filaments with an average thickness of 16.7 dtex is used. Similarly to Patent Document 1, the embodiments of Patent Documents 2 and 3 have a loop-like engagement element having a total thickness of 167 decitex, which is composed of 10 polyphenylene sulfide filaments with an average thickness of 16.7 decitex. Multifilament yarn is used.

Currently available commercially available woven loop hook-and-loop fasteners are made of multifilament yarn with a total thickness of 150 to 300 dtex, consisting of 8 to 15 filaments with an average thickness of 10 to 20 dtex, as yarn for loop-shaped engagement elements. It is widely used in terms of durability and engagement force, and in Patent Documents 1 to 3 mentioned above, the average thickness and the multifilament yarn used in conventional general loop hook-and-loop fasteners are used as multifilament threads for loop-shaped engagement elements. It seems that the number and total thickness of multifilament threads were followed.

Japanese Patent Application Publication No. 2016-131750 JP 2015-62599 Publication International Publication No. 2008/59958

The present inventors used polyphenylene sulfide multifilament yarn, which has a number, thinness, and total thickness that are significantly different from those commonly used in the past, as a multifilament yarn for loop-shaped engagement elements. It satisfies a higher degree of flame retardancy that cannot be achieved with the technologies described in Patent Documents 1 to 3 above, has a high engagement force, and also peels off the engagement even when placed under high temperature and high humidity conditions for a long period of time. It has been found that a woven loop hook-and-loop fastener can be obtained in which the loop-shaped engaging elements are extremely unlikely to be pulled out from the woven fabric base fabric during pulling.

That is, the present invention comprises a fabric consisting of a warp, a loop-shaped engagement element yarn, and a weft, in which the loop-shaped engagement element yarn is woven parallel to the warp, and the loop-shaped engagement element yarn, A flame-retardant loop surface fastener having a large number of loop-shaped engagement elements rising from the surface of the fabric, wherein both the warp threads and the loop-shaped engagement element threads are polyphenylene sulfide (hereinafter abbreviated as PPS). is a multifilament yarn, the weft includes a heat-fusible multifilament yarn, the root of the loop-like engagement element is fixed to the fabric by melting the heat-fusible multifilament yarn, and the loop-like engagement The composite element is a flame-retardant loop hook-and-loop fastener made of a filament bundle with a total thickness of 350-800 dtex, which is a bundle of 70-200 filaments with an average thickness of 3-8 dtex.
In the present invention, heat fusibility refers to the property of softening when heated, and more specifically, it softens when heat fusible fibers are heated above a certain temperature and comes into close contact with the fibers. This means that it is possible to fuse with fibers made of the same or different materials.

Preferably, in such a flame-retardant loop hook-and-loop fastener, the ratio of the area of the weft yarns exposed on the back side of the fabric to the area of the back side of the area of the fabric where the loop-shaped engagement elements are present. is 12% or less, and the filament bundle forming the loop-shaped engagement element has a twist of 15 to 50 T/m.

In such a flame-retardant loop hook-and-loop fastener, preferably, the weft yarns are made of polyester heat-fusible filaments and PPS filaments, and more preferably, the weft yarns have an average thickness of 3.5 mm. - PPS multifilament yarn with a total thickness of 200 to 300 dtex, consisting of 52 to 80 filaments of ~7 dtex bundled together, and a sheath of a PPS multifilament yarn with an average thickness of 3 to 8 dtex, whose sheath component is a heat-fusible component with a low melting point. This is a case in which 15 to 40 polyester core-sheath type filaments are bundled together with a heat-fusible multifilament yarn having a total thickness of 80 to 160 decitex.

In such a flame-retardant loop hook-and-loop fastener, it is further preferable that the loop-shaped engaging element has a total thickness of 420 to 630 dtex, which is a bundle of 80 to 160 filaments with an average thickness of 3.5 to 7 dtex. In this case, the filament bundle consists of a filament bundle of .

In the present invention, a filament bundle with a total thickness of 350 to 800 dtex, which is a bundle of 70 to 200 PPS filaments with an average thickness of 3 to 8 dtex, is used as the loop-shaped engagement element. , compared to the conventional multifilament yarn, which is generally used as yarn for loop-shaped engagement elements and has a total thickness of 150 to 300 decitex, consisting of 8 to 15 filaments of 10 to 20 decitex, it is thinner and has a large number of threads. The main difference is that the filaments are bundled thick multifilament threads.

In other words, the average thickness of each filament is much thinner than the yarn for loop-shaped engagement elements commonly used in the past, and the number of filaments making up the multifilament yarn is also much larger. The total thickness of the thread is also thick. By using such a thick multifilament yarn with a large number of thin filaments bundled together, it is possible to use a multifilament yarn with a conventional total thickness in which filaments with an average thickness are bundled in the conventional number. We have discovered that it is possible to achieve a high degree of flame retardancy, which was previously not possible.

Although the reason for this is not clear, the flame-retardant multifilament thread that makes up the loop-shaped engagement element is made up of a large number of thin filaments. , the surface of the combustible heat-fusible fibers used as part of the weft is widely covered, reducing the exposure of the weft threads that can cause combustion, and the fusible components melting from the heat-fusible fibers. is absorbed into the flame-retardant multifilament yarn for the loop-shaped engagement element, making it difficult to burn, and the loop-shaped engagement element spreads widely to cover the surface of the loop hook-and-loop fastener, making it difficult to burn. It is possible that you are in a difficult situation.

Moreover, surprisingly, by using multifilament yarn in which many thin filaments are bundled together, the engagement force is also lower than when using conventional multifilament yarn with average thickness, number of filaments, and total thickness. , we found that higher excellent values were obtained.

Furthermore, in conventional loop hook-and-loop fasteners, when the engagement is released, the loop-shaped engagement elements are pulled from the textile base fabric, and in order to prevent them from being pulled out, the back side of the loop hook-and-loop fastener is coated with a back coat resin. However, when fixing the loop-shaped engagement element using a back coat resin, the fixing force was low and the fixing tended to be insufficient. In application fields that require flame retardancy, hook and loop fasteners are often exposed to high temperature and high humidity conditions for long periods of time. had the problem that the retention performance of the loop-shaped engagement element by the back coat resin further deteriorated, and the loop-shaped engagement element was likely to be pulled out from the textile base fabric when the engagement was released.

However, as in the present invention, when the base of the loop-shaped engagement element is fixed to the textile base fabric not by the back coat resin but by a fused component from the weft, the thread for the loop-shaped engagement element is attached to the weft. Since the bonding area is wide and tightly adhered, and the surface of the weft is covered so as to hide the weft, the fixing force is high, and even if the hook-and-loop fastener is left in hot and humid conditions for a long time, it will remain fixed. The force does not decrease, and the loop-shaped engagement element is unlikely to be pulled out of the textile base.

FIG. 1 is a photograph of the loop fastener of the present invention, which is bent with the surface on which the loop-shaped engagement elements are raised facing outward. Figure 2 shows a conventional loop fastener in which the number of filaments constituting the loop-like engaging elements is increased, and the loop-like engaging elements are bent with the raised surface facing outward. This is a photographed figure. FIG. 3 shows how to calculate the ratio of the area of the weft yarns exposed on the back side of the fabric to the area of the back side of the area of the fabric where the loop-shaped engagement element is present, as defined in the present invention. It is a photograph of the back side of the loop fastener to be used.

Hereinafter, the woven loop surface fastener of the present invention will be explained in detail.
The textile loop surface fastener of the present invention uses warp yarns, yarns for loop-shaped engagement elements, and weft yarns.

PPS multifilament yarn is used as the warp that makes up the textile base fabric, and the weft is a yarn that is mainly composed of PPS multifilament yarn and is combined with heat-fusible multifilament yarn. It will be done. Furthermore, a PPS multifilament yarn is also used for the yarn for the loop-shaped engagement element.
In this specification, "consisting mainly" means "containing 50% by mass or more."

PPS is a resin that is flame retardant and has excellent heat resistance, as well as excellent fiber forming properties and fiber physical properties.The PPS multifilament yarn used in the present invention is PPS with a weight average molecular weight of 20,000 to 100,000. A multifilament yarn obtained by melt-spinning, drawing, and further heat-treating as necessary is preferable, and such PPS-based multifilament yarn is currently commercially available, and anyone who has the ability to manufacture synthetic fibers can use it. It can be easily manufactured.
PPS may contain flame retardants, colorants, various stabilizers, small amounts of other resin components, etc. within a range that does not interfere with the flame retardant performance of PPS. The mass of PSS is preferably 80% by mass or more, more preferably 90% by mass or more, and 100% by mass with respect to the mass of the PPS multifilament yarn (PPS only). is particularly preferred.

The warp of the woven base fabric used in the present invention is a PPS multifilament yarn with a total thickness of 150 to 350 dtex, consisting of 40 to 80 PPS filaments with an average thickness of 3 to 7 dtex, and the weft is thermally fused. It is preferable in that it covers the surface of the multifilament yarn and achieves a high degree of flame retardancy. The warp of the textile base fabric used in the present invention is preferably a PPS multifilament yarn with a total thickness of 200 to 300 dtex, consisting of 45 to 70 PPS filaments with an average thickness of 3.5 to 6 dtex. More preferred. From the viewpoint of weavability, it is preferable that such a multifilament yarn has a twist of 100 to 800 T/m, more preferably a twist of 200 to 500 T/m. Note that T/m is an abbreviation for turn/meter.

It is preferable that the yarn used as the weft of the hook-and-loop fastener of the present invention is mainly composed of PPS multifilament yarn, which is combined with heat-fusible multifilament yarn. The yarn used as the weft of the hook-and-loop fastener of the present invention is a PPS multifilament yarn with a total thickness of 200 to 300 decitex, which is a bundle of 52 to 80 filaments with an average thickness of 3.5 to 7 decitex, and a sheath component. Combined with a heat-fusible multifilament yarn with a total thickness of 80-160 dtex, which is a bundle of 15-40 polyester core-sheath filaments with an average thickness of 3-8 dtex, which are low-melting-point heat-fusible components. More preferably, it is a thread.
A loop-shaped engagement element is created by using a weft yarn of a heat-fusible multifilament yarn and a PPS multifilament yarn, and by using a multifilament yarn in which a large number of thin filaments are bundled together as the PPS multifilament yarn. In addition to increasing the contact area with the multifilament yarn for use in heat-fusible materials, the excess heat-fusible components melted from the heat-fusible multifilament yarn are absorbed by the combined PPS multifilament yarn, contributing to improved flame retardancy. becomes.

By using the PPS multifilament yarn, in which a large number of such thin filaments are bundled, as the majority of the weft yarn, it is possible to increase the contact area between the weft yarn and the multifilament yarn for the loop-shaped engagement element, as described above. This prevents the loop-shaped engagement element from being pulled out from the textile base fabric, and absorbs the excess heat-fusible component melted from the heat-fusible multifilament yarn into the spun PPS multifilament yarn, making it flame retardant. This will contribute to improving sexuality. When such multifilament yarn has a twist number of 0 to 20 T/m, that is, a so-called non-twisted yarn state, the heat-fusible fibers function effectively and the engaging element yarn is attached to the textile base fabric. This is preferable because it can be firmly fixed.
The mass of the PPS multifilament yarn in the weft is preferably 50% by mass or more, more preferably 60% by mass or more, based on the mass of the entire weft.

The heat-fusible multifilament yarn constituting a part of the weft is a PPS multifilament yarn for an engaging element or a warp, in which at least a part of the filaments is melted at a temperature of 220°C or lower. The molten material will be glued and fixed. As the heat-fusible multifilament yarn, a multifilament yarn made of polyester resin is preferred from the viewpoint of adhesiveness with PPS multifilament yarn.
The mass of the heat-fusible multifilament yarn in the weft is preferably less than 50% by mass, preferably 5% by mass or more, and preferably 10% by mass or more with respect to the mass of the entire weft. is more preferable, and particularly preferably 15% by mass or more.

For the polyester core-sheath type filament, a polyester resin with a low melting point is used as the sheath component for ease of handling during heat fusing, and a high melting point resin that does not melt at the temperature used when heat fusing multifilament yarn is heat fusing is used. A multifilament yarn consisting of filaments having a core-sheath cross section and having a polyester resin as a core component is preferred.
A specific example of the sheath component of a polyester core-sheath type filament is a copolymerized component such as isophthalic acid, sulfoisophthalic acid, adipic acid, propylene glycol, etc., with a melting point of 210°C or less, particularly 120 to 200°C. Polyethylene terephthalate-based or polybutylene terephthalate-based copolymers are preferred.

A specific example of the core component of a polyester core-sheath type filament is a polyester with a high melting point, specifically a polyester that is not copolymerized or has a melting point 20 to 100°C higher than the sheath component resin even if it is copolymerized. For example, polyethylene terephthalate homopolymer, polyethylene naphthalate homopolymer, polybutylene terephthalate homopolymer, etc. are preferred.
The cross-sectional shape of the sheath-core filament may be a single-core sheath-core or a multi-core sheath-core, or may be a concentric sheath-core or an eccentric sheath-core. Furthermore, it may have a bimetallic cross section. That is, it is sufficient that the low melting point component is exposed on the surface. The weight ratio of the core component to the sheath component is preferably in the range of 75/25 to 30/70.

As the heat-fusible multifilament yarn, a heat-fusible multifilament yarn with a total thickness of 80 to 160 decitex, which is a bundle of 15 to 40 polyester core-sheath type filaments with an average thickness of 3 to 8 decitex, is suitable. used. The weight ratio of the PPS multifilament yarn and the heat-fusible multifilament yarn constituting the weft is preferably in the range of 80:20 to 60:40 in terms of flame retardancy and engagement element fixability, and more preferably. The range is from 75:25 to 65:35.
In addition, in the present invention, the warp, weft, and yarn for loop-shaped engagement elements may contain other materials as long as they do not impair the flame retardancy and engagement force of the hook-and-loop fastener, or its performance when left in hot and humid conditions for a long period of time. A small amount of filaments may be combined.
It is preferable that the mass of the other filaments in the warp, weft, or loop-shaped engagement element yarn is 10% by mass or less with respect to the mass of the warp, weft, or loop-shaped engagement element yarn, and 5% by mass or less. % or less is more preferable.

Next, the PPS multifilament yarn constituting the loop-shaped engagement element, which is a feature of the present invention, will be explained. It consists of a bundle of 70 to 200 filaments with a total thickness of 350 to 800 decitex. As mentioned above, this multifilament yarn has a much thinner average thickness per filament than the loop-shaped engagement element yarn commonly used in the past, and also constitutes a multifilament yarn. The number of filaments is much larger, and the total thickness is also thicker.

When the average thickness of the PPS filaments constituting the loop-shaped engagement element exceeds 8 decitex, when the number of PPS filaments is less than 70, or when the total thickness of the thread for the loop-shaped engagement element is 350 decitex. If it is less than that, the flame retardance is inferior and unsatisfactory.
In addition, if the average thickness of the PPS filaments is less than 3 dtex, if the number of filaments exceeds 200, or if the total thickness of the thread for the loop-shaped engagement element exceeds 800 dtex, there are Troubles are likely to occur, and even if it can be manufactured, repeated engagement and separation may cause the filaments that make up the loop-shaped engagement element to break easily, the engagement force may decrease, and the surface becomes fluffy and unsightly. .

By using such a thick multifilament yarn in which a large number of thin filaments are bundled together as a loop-shaped engagement element, a high degree of flame retardance that could not be achieved with conventional multifilament yarns can be achieved. Moreover, a higher and more excellent engagement force can be obtained than in the case of using conventional multifilament yarns having an average thickness, number of yarns, and total thickness. Preferably, the loop-shaped engagement element is composed of a filament bundle with a total thickness of 420 to 630 dtex, which is a bundle of 80 to 160 PPS filaments with an average thickness of 3.5 to 7 dtex.

Note that the average thickness here means that thick filaments and thin filaments may coexist. That is, the average thickness means the value obtained by dividing the total thickness (decitex) of the filaments present in the multifilament yarn by the number of filaments constituting the multifilament. Of course, in the present invention, it is preferable that the filaments constituting the multifilament yarn have approximately the same thickness.

When a multifilament yarn consisting of such thin filaments is used as a yarn for a loop-shaped engagement element, the thin filaments are rubbed and cut when weaving a loop hook-and-loop fastener, and as a result, they may wind around devices, etc. However, by adding a slight twist to the multifilament yarn, specifically, a twist of 15 to 50 T/m, this concern can be resolved. More preferably, a twist of 20 to 40 T/m is applied.
As mentioned above, by lightly twisting the multifilament yarn for the loop-shaped engagement element, problems arise when using the multifilament yarn in which a large number of thin filaments are bundled as the yarn for the loop-shaped engagement element. That is, when weaving a hook-and-loop fastener, it is possible to prevent the problem that the filaments constituting the multifilament yarn are easily cut due to friction with the device, which deteriorates the weaving process passability.

In conventional loop hook-and-loop fasteners, the loop-shaped engagement element is constructed by adding as little twist as possible to the yarn for the loop-shaped engagement element so as not to reduce the engagement force. Typically, the individual filaments are widely spaced to facilitate engagement with the hook-like engagement elements. In order to actively disassemble the loop-shaped engagement element, it is common practice to rub the surface of the loop fastener with clothing, but in the present invention, a method that is contrary to the conventional idea of disassembling the loop fastener is used. That is, by imparting a gentle twist, the reduction in engagement force is suppressed and the problem of reduced weavability, which is the fate of multifilament yarns made of thin filaments, is solved.

In the present invention, a woven fabric base fabric having loops made of the engaging element yarns on its surface is first woven from the warp, weft, and loop-shaped engaging element yarns as described above.

The thread for the loop-shaped engagement element is woven into the fabric as part of the warp, that is, parallel to the warp, in terms of its pull-out resistance. The weaving density is preferably 35 to 60 warps/cm (including threads for engagement elements) and 13 to 20 wefts/cm, with a ratio of 1 to 2 to 5 warps, particularly 1 to 4 warps. Preferably, the thread for the loop-shaped engagement element is inserted in a proportion. Note that the above-mentioned number of weft yarns is the number when the weft yarns are inserted from one direction, and is the number when the weft yarns are counted as one in a round trip.

The loop is formed so as to protrude from the surface of the woven fabric to a height of 1.5 to 2.5 mm, more preferably 1.70 to 2.20 mm. The loop-shaped engagement element preferably forms a loop at a location where it straddles one warp, and where it does not form a loop, it preferably floats around the weft parallel to the warp without straddling the warp. Parallel to the warp as used in the present invention means that it may straddle the warp at the location where the loop is formed, but in other locations, it is normally woven parallel to the warp without straddling the warp. means the state.

The weave structure of the loop surface fastener is preferably a normal single-layer plain weave. The density of the loops is preferably 30 to 70 loops/cm ² , particularly preferably 40 to 60 loops/cm ² .

In the fabric having loops on the surface woven in this manner, the heat-fusible multifilament yarn contained in the weft melts, and the engagement element yarn is fused and fixed to the fabric base fabric. The temperature during melting is preferably 220 to 255°C, more preferably 230 to 250°C, even more preferably 235 to 245°C. By treating the fabric under this temperature condition for 30 seconds to 4 minutes, more preferably for 1 to 3 minutes, the molten components of the heat-fusible multifilament yarn contained in the wefts are melted and present nearby. Alternatively, the warp yarns and/or the engaging element yarns made of intersecting PPS multifilament yarns are fixed. As a result, the engagement element thread is firmly fixed to the textile base fabric.

In addition, in conventional textile-based hook-and-loop fasteners, an adhesive called back coat resin is applied to the back surface of the textile base fabric in order to fix the engaging elements to the textile base fabric. When conventional textile-based hook-and-loop fasteners are flame-retardant loop fasteners that are left in high-temperature, high-humidity conditions for long periods of time, the fixation of the engaging elements by the back coat resin may loosen due to long-term exposure to high-temperature, high-humidity conditions. Therefore, when the engagement of such a loop surface fastener is released, the engagement element is easily pulled out from the textile base fabric. On the other hand, the present invention uses a method in which a part of the weft is fused to fix the engaging element. Even if exposed to water for a long time, the fixation of the engaging element hardly deteriorates. Therefore, in the present invention, there is no possibility that the engaging element is pulled out from the textile base fabric when the engagement is released. Therefore, in the present invention, application of a back coat resin is not necessary.

In this way, the loop surface fastener of the present invention is obtained, and one of the major features of the loop surface fastener of the present invention is that the weft is covered with the warp and the thread for the engagement element, and the surface and back surface of the textile base fabric are One example is that there is little exposure to

FIG. 3 is an enlarged view of the back side of the loop fastener of the present invention (i.e., the side where the engaging elements are not present), and from this figure, it can be seen that the area of the fabric where the loop-shaped engaging elements are present. The ratio of the area of the weft yarns exposed on the back side of the fabric to the back surface area (hereinafter sometimes referred to as the back side exposure rate of the weft yarns) is determined. Specifically, in this figure, the threads running in the left and right horizontal directions are the weft threads, and the warp threads and engagement element threads float up and down in the vertical direction so as to cover these weft threads. . How to determine the area ratio of the weft yarns exposed on the back side of the fabric will be explained using FIG. 3. First, determine a range where the thread for the engaging element repeats a certain amount, enclose the exposed parts of the weft existing in that range, calculate the area, calculate the total value of these areas, and then The ratio of the exposed area of the weft to the total area of the warp, weft, and engagement element yarn in a range where the yarn is repeated at a certain level is determined. Then, the ratio of the total exposed area of the weft at five arbitrary locations is determined, and the average value thereof is calculated to calculate the ratio of the weft that is exposed on the back side of the fabric. Specifically, the back side of the hook-and-loop fastener was photographed using a Keyence microscope at a magnification of 100 times, and the distance in the warp direction was measured for the number of weft threads at a certain period, and the same movement was made in the weft direction. The distances between the engaging element yarns were measured, a measurement range was set from these distances, and the area of each of the warp, weft, and engaging element yarns was calculated. From the area, the ratio of the area of only the part where the weft was exposed was calculated.
The above-mentioned "certain repetition ("certain period")" varies depending on the weaving structure, and means, for example, "a range for two wefts" or "a range for four wefts." In addition, in the embodiment of the present application, the "fixed repetition ("fixed period")" is defined as "the range of two wefts."
The above-mentioned "distance between threads for engaging elements that are moving in the same way" varies depending on the weaving structure, for example, when there are two types of frames of a loom for forming loops, a front frame and a rear frame, In addition, when the front frame and the rear frame are arranged alternately, it means "the loop formed with the same front frame, that is, the distance to the next loop next to the loop formed with the front frame", and the loop is If the loom frame used for forming the loop is of one type, regardless of whether it is a front frame or a rear frame, it means "distance to the next loop". In addition, in the embodiment of the present application, "the distance between the threads for engaging elements that move in the same way" is defined as "the distance between the threads for the engaging elements that move in the same way" as "the distance between the loops formed in the same front frame, that is, the distance between distance to the loop.

In the loop fastener of the present invention, the ratio of the area of the weft yarns exposed on the back side of the fabric to the area of the back side of the fabric area where the loop-shaped engaging elements are present is preferably 12% or less. I found something favorable. That is, it is preferable that 88% or more of the back surface is covered by the warp and the thread for the engagement element, and the area ratio of the weft where the weft is exposed on the back surface of the fabric is 12% or less. The ratio of the area of the weft yarn exposed on the back side of the weft fabric (hereinafter sometimes referred to as the back side exposure rate) is greatly related to the flame retardance when heat-fusible filaments are used for the weft yarn. The lower this value is, the more difficult it is for the hook-and-loop fastener to burn. In addition, it is preferable that there is no space on the back surface in which neither the warp nor the weft nor the engagement element yarn exists.

In the loop hook-and-loop fastener of the present invention, the proportion of exposed weft threads is small, and the reason for this is that the engagement element thread is a thick multifilament thread made up of many thin filaments, and the warp threads are also multifilament threads made of thin filaments. It is a filament yarn, and the engaging element yarn and the warp yarn are spread along the weft direction so as to cover the surface of the weft yarn. Considering that in conventional loop hook-and-loop fasteners, the back side exposure rate of the weft yarns is 18 to 35%, it can be seen that the loop hook-and-loop fastener of the present invention has an extremely low back side exposure rate of the weft yarns. More preferably, the back surface exposure rate is 10% or less.

In order to lower the back surface exposure rate of the weft yarns, in addition to making the loop-shaped engagement element a thick multifilament yarn made of a large number of thin filaments, and making the warp yarns also a multifilament yarn made of thin filaments. When weaving a hook-and-loop fastener, it is preferable to minimize the tension applied to the warp yarns and the engaging element threads, and further increase the tension applied to the weft yarns.

FIG. 1 is an enlarged photograph of a loop fastener according to the present invention, which is rolled up with the surface side, that is, the surface where the loop-shaped engagement elements are present, facing outward. Additionally, Figure 2 is an enlarged photograph of a conventional loop fastener in which the number of filaments making up the loop-shaped engaging element is slightly increased, with the surface side of the loop fastener rolled in the same way. . As can be seen from these figures, a large number of loop-shaped engagement elements made of multifilament yarns stand up from the surface of the textile base fabric.

As can be seen from these figures, in the loop hook-and-loop fastener of the present invention (FIG. 1), its surface is covered with a loop-shaped engaging element that spreads laterally. It can be seen that the woven base is much less exposed than when it is simply increased (Figure 2). As described above, it is thought that one of the reasons why the loop surface fastener of the present invention exhibits excellent flame retardancy is that the woven base fabric is less exposed, together with the less exposed weft yarns on the back side.

The loop fastener of the present invention has extremely excellent flame retardancy and high engagement force, and furthermore, even if left under high temperature and high humidity conditions for a long time, the tensile force when peeling off the engagement will cause the loop fastener to remain in place. The composite element is rarely pulled out from the textile base fabric, and therefore is used in fields that require a high degree of flame retardancy, such as fixing seats and structural parts of aircraft, automobiles, trains, ships, etc., and is also used in firefighting applications. It can also be suitably used as a component for clothing, clothing for high-temperature work, helmets, and shoes.

Hereinafter, the present invention will be specifically explained with reference to Examples and Comparative Examples.
In addition, in Examples and Comparative Examples, flame retardancy was measured according to the vertical flame retardant test method (14 CFR PART25 Sec25.853(a)). Specifically, the hook-and-loop fastener was attached to a U-shaped jig in a combustion testing machine so that the exposed surface was 5.08 cm x 30.48 cm long, the sample was held vertically, and a hand burner was applied from below for 12 seconds. This was to observe the combustion state when a flame started, and measured the time from when the burner was released until it self-extinguished. The measurement was performed five times, and the average value was calculated.

Regarding the engagement force, the hook hook and loop fastener A48600 manufactured by Kuraray Fastening Co., Ltd. with a width of 25 mm was used as the hook hook fastener to be engaged, the test piece was prepared with a length of 100 mm and a width of 25 mm, and the shear strength was determined according to EN13780. The peel strength was measured according to EN12242. The tensile tester used was one manufactured by SHIMADZU. Then, the average value of the five measurement results was adopted. The engagement force was measured by measuring the initial engagement force (both shear and peel) and the engagement force (shear and peel) after 100 engagements and separations. Then, the average value of the five measurement results was adopted.

Regarding the pull-out force of the loop-shaped engagement element under high temperature and high humidity conditions, after leaving the hook-and-loop fastener for 10 weeks under conditions of 75°C and 95% humidity, The maximum tensile force required to pull it out was measured using a tensile tester.
A tensile tester made by SHIMADZU is used. A loop hook and loop fastener with a width of 25 mm is prepared, the loop hook and loop fastener is bent so as to be perpendicular to the warp, and the bent loop hook and loop fastener is held in the chuck of the tensile tester. A clip is hooked onto the loop portion of the loop-shaped engagement element of the attached loop surface fastener, and the clip is pulled at a speed of 300 mm/min to pull out the loop-shaped engagement element from the textile base fabric.
In addition, when the loop-shaped engagement element was broken due to tension during the measurement, the maximum tensile force at that time was taken as the value of the pulling force. The measurement was performed on 10 arbitrary loop-shaped engagement elements selected evenly from among the loop-shaped engagement elements on the surface of the loop surface fastener, and the average value of these values was adopted. In order to make it easier to understand the effect of leaving the loop-shaped engagement element under high-temperature and high-humidity conditions for a long time on the ease with which the loop-shaped engagement element is pulled out, we also measured the pull-out force of the loop-shaped engagement element before leaving it under high-temperature and high-humidity conditions for a long time. The value was recorded as the initial value.
In addition, in Examples and Comparative Examples, the total thickness and number of multifilament threads used are expressed as total thickness/number, and the value obtained by dividing the total thickness by the number of threads is the number of filaments 1 making up the multifilament. Average thickness per book.

(Example 1)
A flame-retardant loop hook-and-loop fastener was produced from the following warp, weft, and yarn for loop-shaped engagement elements by the following manufacturing method.

(1) Warp: PPS multifilament yarn twisted at 309 T/m (250 dtex/60 filaments, average monofilament thickness is 4.2 dtex)
(2) Weft: Untwisted yarn of the following PPS multifilament yarn and heat-fusible multifilament yarn with core-sheath cross section. It has a twist of about 10 T/m that naturally occurs when it is run.
・Core-sheath cross-section heat-fusible multifilament yarn (120 dtex/24 filaments, monofilament average thickness 5 dtex), consisting of the following sheath part and core part.
[Sheath] Low melting point copolymerized polyethylene terephthalate (CoPET), copolymerized component: isophthalic acid, melting point: 181°C
[Core] High melting point non-copolymerized polyethylene terephthalate (PET) Melting point: 260°C
[Core-sheath weight ratio] Core component 70:Sheath component 30
[Cross-sectional shape] Concentric circular cross section of single-core sheath (3) Yarn for loop-shaped engagement element: Made of PPS multifilament yarn (500 dtex/120 filaments, average monofilament thickness is 4.2 dtex), 38 T/m Twisted yarn with a twist of

[Manufacture of loop hook-and-loop fasteners]
From the warp, loop-shaped engagement element yarn, and weft, the weaving density is 52 warp/cm and 18 weft/cm, and the loop-shaped engagement element yarn is parallel to the warp at a ratio of 1 for every 4 warp. This was inserted into a fabric to weave a plain weave fabric having loops made of thread for loop-shaped engagement elements on its surface. The loop height was 2.5 mm, and the loop density was 53 loops per cm ² of the woven base. Weaving was carried out by adjusting the thread tension so that as little tension as possible was applied to the warp threads and the loop-shaped engagement element threads, and tension was applied to the weft threads.

The resulting looped fabric was heat-treated with hot air at 240° C. for 2 minutes. Through this process, the sheath component of the heat-fusible multifilament yarn with a core-sheath cross section is melted and melted into the surrounding yarns, fixing the yarns constituting the fabric and moving the yarn for the loop-shaped engagement element into the fabric base fabric. was firmly fixed. The surface of the obtained loop hook-and-loop fastener was photographed (Figure 1). As is clear from FIG. 1, it can be seen that a large number of laterally spread loop-shaped engagement elements cover the surface of the textile base fabric.
An enlarged photograph of the back side of the obtained loop hook-and-loop fastener was taken, and the back side exposure rate of the weft yarn was calculated to be 8.5%.

This loop surface fastener was subjected to a flame retardant test, an engagement force test, and a pull-out test of the loop-shaped engagement element. The results are shown in Table 1 below. From Table 1, it can be seen that the loop surface fastener of this example has extremely excellent flame retardancy, engagement force, and pull-out force of the loop-shaped engagement element.
For this reason, the loop hook and loop fastener obtained in Example 1 is extremely suitable as an attachment material for applications that require a high level of flame retardancy, engagement force, and pullout force for loop-shaped engagement elements, such as the vehicle field. It can be seen that it is something like this.

(Examples 2 to 4)
In the above Example 1, the following three types of PPS multifilament yarns (with a soft twist of 38 T/m) were used as the multifilament yarn for the loop-shaped engagement element, and the same method as in Example 1 was carried out. Three types of loop hook-and-loop fasteners were produced, and similarly to Example 1, a flame retardancy test, an engagement force test, and a pull-out test of the loop-shaped engagement elements were conducted. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner. The results are also listed in Table 1.

[Example 2] PPS multifilament yarn of 750 dtex/180 filaments made of PPS filaments with an average thickness of 4.2 dtex [Example 3] PPS multifilament yarn of 400 dtex/120 filaments made of PPS filaments with an average thickness of 3.3 dtex PPS multifilament yarn [Example 4] PPS multifilament yarn of 740 dtex/120 filaments made of PPS filaments with an average thickness of 6.2 dtex

It was found that the loop surface fasteners obtained in Examples 2 to 4 above all had excellent flame retardancy and engagement force, and excellent pull-out resistance of the loop-shaped engagement elements. In the case of Example 2, the loop-shaped engagement element was too thick and was slightly inferior to that of Example 1 in terms of engagement force. In the case of Example 3, since the filaments constituting the yarn for the loop-shaped engagement element were thin, there were slight problems such as the filaments breaking and the surface becoming fluffy when weaving the loop hook-and-loop fastener. . Furthermore, in the case of Example 4, the engagement force was slightly inferior to that of Example 1, probably due to the fact that the multifilament yarn and the individual filaments were thicker than in Example 1. It became.

(Comparative Examples 1 to 5)
In the above Example 1, the following five types of PPS multifilament yarns (all of them are lightly twisted with a twist number of 38 T/m) were used as the multifilament yarn for the loop-shaped engagement element, and the same as in Example 1 was used. Five types of loop hook-and-loop fasteners were produced by the method described above, and in the same manner as in Example 1, a flame retardancy test, an engagement force test, and a pull-out test of the loop-shaped engagement elements were conducted. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner as in Example 1. The results are shown in Table 2 below. Note that FIG. 2 shows the surface state of the loop fastener of Comparative Example 2. In addition, in Comparative Example 1 and Comparative Example 2, the tension related to the warp, loop-shaped engagement element thread, and weft during weaving was returned to normal tension.

[Comparative Example 1] PPS multifilament yarn of 167 dtex/10 filaments made of PPS filaments with an average thickness of 16.7 dtex [Comparative Example 2] PPS multifilament yarn of 334 dtex/20 filaments made of PPS filaments with an average thickness of 16.7 dtex PPS multifilament yarn [Comparative example 3] 500 dtex made of PPS filaments with an average thickness of 16.7 dtex/30 filaments of PPS multifilament yarn [Comparative example 4] 667 dtex made of PPS filaments with an average thickness of 16.7 dtex /40 filament PPS multifilament yarn [Comparative Example 5] 250 decitex/60 filament PPS multifilament yarn consisting of PPS filaments with an average thickness of 4.2 decitex

As a result, the loop fasteners of Comparative Examples 1 to 5 were significantly inferior to those of Example 1 in either flame retardancy or engagement force. In particular, the loop hook-and-loop fasteners of Comparative Examples 1 and 5, which have a high weft back surface exposure rate, are significantly inferior to those of Example 1 in terms of flame retardancy, and furthermore, the average thickness of the filaments is thick, the number of filaments is small, and the total thickness is The loop hook-and-loop fastener of Comparative Example 1, which had a small force, was also significantly inferior in terms of engagement force. On the other hand, the loop hook-and-loop fasteners of Comparative Examples 2 to 4, in which the average thickness of the filaments is increased and the number of filaments is decreased to increase the total thickness, are inferior to those of the above examples, but have a certain level of performance. Although flame retardancy has been achieved, it is not satisfactory in terms of high flame retardancy, and furthermore, it is considerably inferior to that of Example 1 in terms of engagement force, and both high flame retardance and engagement force are required. It was not suitable for applications such as aircraft.

(Comparative Examples 6-7)
In the above Example 1, the following two types of PPS multifilament yarns (all lightly twisted with a twist number of 38 T/m) were used as the multifilament yarn for the loop-shaped engagement element, and the same as in Example 1 was used. Two types of loop hook-and-loop fasteners were produced using the method described above. Then, in the same manner as in Example 1, the obtained loop surface fastener was subjected to a flame retardancy test, an engagement force test, and a loop-shaped engagement element pull-out test. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner as in Example 1.

[Comparative Example 6] PPS multifilament yarn of 385 dtex/40 filaments made of PPS filaments with an average thickness of 9.6 dtex [Comparative Example 7] PPS multifilament yarn of 260 dtex/120 filaments made of PPS filaments with an average thickness of 2.2 dtex PPS multifilament yarn

As a result, the loop surface fastener of Comparative Example 6 had a weft backside exposure rate of 12.6%, a combustion test result of 5.5 seconds, an initial engagement force of 11.8 N/cm ² for shear, and 0.5 seconds for peel. 98N/cm, the engagement force after 100 engagements and peelings is 11.7N/cm ² for shear, 0.99N/cm for peel, and the result of the pull-out resistance test of the loop-shaped engagement element is 15.4N/bundle at the initial stage. , 15.4 N/bundle after being left for a long time under hot and humid conditions. From the above, the loop hook-and-loop fastener of Comparative Example 6 is considerably inferior to that of Example 1 in terms of engagement force, and is used for aircraft, etc., which require both high flame retardancy and high engagement force. It cannot be said that it is suitable for this purpose.
Regarding Comparative Example 7, when weaving the loop hook-and-loop fastener, the filaments were severely broken and the broken filaments wound around the device, causing trouble and production was canceled midway through.

(Comparative example 8)
In the above-mentioned Example 1, a thread consisting only of PPS multifilament yarn, which does not contain a heat-fusible multifilament yarn in the core-sheath cross section, is used as the weft yarn, and in order to fix the loop-shaped engagement element to the textile base fabric, the back side of the textile fabric is A loop hook-and-loop fastener was produced by applying 120 g/m ² of a flame-retardant polyurethane solution and drying it.

As a result of subjecting this loop hook-and-loop fastener to a pull-out test of the loop-shaped engaging element, the initial pull-out force was only 3.5 N/bundle, and the pull-out force after being left at 75°C and 95% humidity for 10 weeks was this low. The force was reduced to only 1.4 N/bundle. The originally low pull-out force becomes even lower after being exposed to high temperature and high humidity conditions for a long period of time. Many loop-shaped engagement elements are easily pulled out from the textile base fabric, and in such a state that they are easily pulled out, satisfactory engagement force cannot be obtained, and they are often exposed to high temperature and humid conditions for a long period of time. It is clear that it is not acceptable as a flame-retardant hook-and-loop fastener.

(Example 5)
A loop surface fastener was produced in the same manner as in Example 1 except that the weaving density was changed to 44 warps/cm and 22 wefts/cm. Then, in the same manner as in Example 1, a flame retardancy test, an engagement force test, and a pull-out test of the loop-shaped engagement element were conducted. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner as in Example 1. The results are shown in Table 3.

(Example 6)
In the above Example 1, loops were carried out in the same manner as in Example 1 except that the PPS multifilament yarn used as the warp was changed to a PPS multifilament yarn of 384 decitex/120 filaments made of PPS filaments with an average thickness of 3.2 decitex. Manufactured hook-and-loop fasteners. Then, in the same manner as in Example 1, a flame retardancy test, an engagement force test, and a pull-out test of the loop-shaped engagement element were conducted. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Examples 9-10)
In the above Example 1, the following two types of PPS multifilament yarns (all lightly twisted with a twist number of 38 T/m) were used as the multifilament yarn for the loop-shaped engagement element, and the same as in Example 1 was used. Two types of loop hook-and-loop fasteners were produced using the method described above. Then, in the same manner as in Example 1, the obtained loop surface fastener was subjected to a flame retardancy test, an engagement force test, and a loop-shaped engagement element pull-out test. Furthermore, the back surface exposure rate of the weft yarns was also measured in the same manner as in Example 1. The results are shown in Table 3.

[Comparative Example 9] 1000 dtex/240 filament PPS multifilament yarn made of PPS filaments with an average thickness of 4.2 dtex [Comparative Example 10] 1340 dtex/80 filament yarn made of PPS filaments with an average thickness of 16.7 dtex PPS multifilament yarn

From the above results, both the loop hook-and-loop fasteners of Examples 5 and 6 are superior to those of Example 1 in terms of flame retardancy, engagement force, and pull-out force of the loop-shaped engagement elements after being exposed to high temperature and humidity conditions for a long time. It was very good, almost the same as before. These loop hook-and-loop fasteners are extremely suitable as fasteners in the field of vehicles, especially aircraft, where a high degree of flame retardancy is required.
On the other hand, in both the loop hook-and-loop fasteners of Comparative Examples 9 and 10, the total thickness of the multifilament threads forming the loop-shaped engagement elements is too thick, which imposes a large load on the loom during the manufacturing process, leading to damage to the parts. In addition, the hook-shaped engagement element could not be engaged sufficiently, resulting in inferior engagement force, and it could not be said to be suitable for use in fixing members with heavy loads. . In particular, the loop fastener of Comparative Example 10 was slightly inferior to that of the example in terms of flame retardancy.

Claims (7)

A fabric consisting of a warp, a loop-shaped engagement element yarn, and a weft, in which the loop-shaped engagement element yarn is woven parallel to the warp, and the loop-shaped engagement element yarn, which stands up from the surface of the fabric. A flame-retardant loop hook-and-loop fastener having a large number of loop-shaped engagement elements,
Both the warp yarn and the loop-shaped engagement element yarn are polyphenylene sulfide-based multifilament yarns,
The weft yarn includes a heat-fusible multifilament yarn,
The root of the loop-shaped engagement element is fixed to the fabric by melting the heat-fusible multifilament yarn,
A flame-retardant loop hook-and-loop fastener, wherein the loop-shaped engaging element is composed of a filament bundle having a total thickness of 350 to 800 dtex, which is a bundle of 70 to 200 filaments with an average thickness of 3 to 8 dtex. The difficulty according to claim 1, wherein the ratio of the area of the weft yarn exposed on the back surface of the fabric to the area of the back surface of the region of the fabric where the loop-shaped engagement element is present is 12% or less. Retardant loop hook and loop fastener. The flame-retardant loop hook-and-loop fastener according to claim 1 or 2, wherein the filament bundle forming the loop-shaped engagement element has a twist of 15 to 50 T/m. The flame-retardant loop surface fastener according to any one of claims 1 to 3, wherein the weft yarns are made of polyester heat-fusible filaments and polyphenylene sulfide filaments. The weft is a polyphenylene sulfide multifilament yarn with a total thickness of 200 to 300 dtex, which is a bundle of 52 to 80 filaments with an average thickness of 3.5 to 7 dtex, and the sheath component is a heat-fusible component with a low melting point. According to claim 4, the polyester core-sheath type filament having an average thickness of 3 to 8 dtex is combined with a heat-fusible multifilament yarn having a total thickness of 80 to 160 dtex, which is a bundle of 15 to 40 polyester core-sheath filaments having an average thickness of 3 to 8 dtex. Flame retardant loop hook and loop fastener as described. Any one of claims 1 to 5, wherein the loop-shaped engagement element is composed of a filament bundle having a total thickness of 420 to 630 dtex, which is a bundle of 80 to 160 filaments with an average thickness of 3.5 to 7 dtex. Flame retardant loop hook and loop fastener as described. According to any one of claims 1 to 6, the warp is a polyphenylene sulfide multifilament yarn having a total thickness of 150 to 350 dtex, in which 40 to 80 filaments with an average thickness of 3 to 7 dtex are bundled. Flame retardant loop hook and loop fastener.

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