Hook-and-loop fastener and method for producing same, and heat insulation member fastening tool, heat insulation member using same, and method for fixing same

Abstract

A hook-and-loop fastener is provided with: a base fabric (5) which is formed of thermoplastic resin fibers (1, 2) and in which a first surface is on the obverse side and a second surface is on the reverse side; a plurality of hook-shaped and / or loop-shaped engagement elements (3) which rise from the first surface of the base fabric and which are formed from an engagement element yarn forming a portion of the base fabric; and an adhesive resin (7) which has a portion that is continuous in a planar manner and which fixes the engagement element yarn inside the base fabric. The dimensional change rate of the hook-and-loop fastener in at least one of the length direction and the width direction when exposed at 200°C for 24 hours is 5.0% or less.

Description

Hook-and-loop fastener and its manufacturing method, heat insulating material fastener, heat insulating material using the same and its fixing method Related Applications

[0001] This application claims priority from Japanese Patent Application No. 2023-214241, filed December 19, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a hook-and-loop fastener having excellent heat resistance and a method for manufacturing the same, and also to a heat insulating material fastener including the hook-and-loop fastener, a heat insulating material using the same, and a method for fixing the same.

[0003] In recent years, hook-and-loop fasteners have been used as various attachment means in a wide range of fields, including vehicles such as automobiles, aircraft, and trains, special clothing such as fire-resistant clothing, firefighting clothing, and high-temperature work clothing, and industrial materials such as heat insulating materials and building materials. Among these various fields, applications related to special clothing and heat insulating materials require heat resistance because they are exposed to high temperatures.

[0004] For example, Patent Document 1 (Japanese Patent No. 6476432) describes a hook-and-loop fastener that is made of warp yarns, weft yarns, and threads for engaging elements, all of which are made of polyphenylene sulfide-based fibers, and has hook- or loop-shaped engaging elements on the surface of a woven base fabric, and an acrylic flame-retardant adhesive layer on the back via a layer of polyurethane, in which the weft yarns contain heat-fusible fibers in addition to the polyphenylene sulfide-based fibers, and the threads for engaging elements are fixed to the woven base fabric by the heat-fusible fibers.

[0005] This document describes a technique in which a fiber having heat-fusible and heat-shrinkable properties is used as part of the weft threads that make up the hook-and-loop fastener, and the fiber is fused and shrunk to fix the threads for the engaging elements to the woven base fabric and to tighten the weave of the woven base fabric.This prevents polyurethane from penetrating to the surface side of the hook-and-loop fastener even if it is applied to the back side, and prevents the flame retardancy of the hook-and-loop fastener from being impaired.

[0006] Furthermore, Patent Document 2 (US Patent Application Publication No. 2004 / 0166282) discloses a fastener component comprising a woven fabric base containing flame-retardant fibers and a plurality of fibers of a polymer that melts or decomposes when exposed to flames, woven into the woven fabric base, the fibers forming fastener elements extending from a large surface of the base fabric for releasably engaging with associated fastener components, and the fibers are bonded by a binder impregnated into the base fabric.

[0007] Patent No. 6,476,432 U.S. Patent Application Publication No. 2004 / 0166282

[0008] However, in Patent Document 1, in addition to polyphenylene sulfide-based fibers, the weft yarns also contain a considerable amount of heat-fusible fibers whose sheath melting point is as low as 155°C, and the presence of these heat-fusible fibers may result in insufficient heat resistance in high-temperature environments of 200°C or higher. In addition, the pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive shrinks at high temperatures, which may cause distortion and wrinkles between the hook surface fastener and the pressure-sensitive adhesive layer. Furthermore, Patent Document 2 describes the use of a polymer that melts or decomposes when exposed to flame, but does not describe the state of fastener components in high-temperature usage environments.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a hook-and-loop fastener that is suitable for use at high temperatures.

[0010] Another object of the present invention is to provide a method for manufacturing a hook-and-loop fastener that can improve flame retardancy and maintain or improve engagement force.

[0011] The present inventors conducted research addressing the issue of uncertainty about how hook-and-loop fasteners would behave in environments where they are continuously used at high temperatures, for example, in environments where they are continuously used at about 200° C., and found that even hook-and-loop fasteners made of heat-resistant thermoplastic resin fibers lose dimensional stability when continuously exposed to 200° C. Therefore, further research was conducted focusing on dimensional stability at 200° C., and they discovered that by forming loops on the first surface of a base fabric made of thermoplastic resin fibers and having a first surface as the front side and a second surface as the back side with threads for engaging elements, heat-treating the base fabric at a specific temperature under tension, and then applying an adhesive resin from the second surface of the heat-treated loop base fabric to fix the threads for engaging elements forming the loops with the adhesive resin, a hook-and-loop fastener having sufficient engaging force at high temperatures and a reduced rate of dimensional change can be obtained, thereby completing the present invention.

[0012] That is, the present invention can be configured in the following aspects. [Aspect 1] A hook-and-loop fastener comprising a base fabric formed of thermoplastic resin fibers and having a first surface as a front side and a second surface as a back side, a plurality of hook- and / or loop-shaped engaging elements formed from engaging element threads rising from the first surface of the base fabric and constituting part of the base fabric, and an adhesive resin having a planar continuous portion and fixing the engaging element threads within the base fabric, wherein the dimensional change rate in at least one of the length and width directions of the hook-and-loop fastener (preferably the length direction, more preferably the length and width directions) when exposed to 200°C for 24 hours is 5.0% or less (preferably 4.5% or less, more preferably 3.5% or less, particularly preferably 2.5% or less). [Aspect 2] A hook-and-loop fastener according to Aspect 1, having a width of 20 mm or more (preferably 25 mm or more, more preferably 30 mm or more). [Aspect 3] A hook-and-loop fastener according to Aspect 1 or 2, wherein the base fabric is formed of polyphenylene sulfide-based fibers. [Aspect 4] The hook-and-loop fastener according to any one of Aspects 1 to 3, wherein the adhesive resin has permeated into at least a portion of the base fabric. [Aspect 5] The hook-and-loop fastener according to Aspect 4, wherein, in the protruding direction of the engaging elements, the adhesive resin has permeated into the engaging elements from the first surface of the base fabric at a rate of 50% or less (preferably 40% or less), with the height from the first surface of the base fabric to the top of the engaging element being taken as the reference (100%). [Aspect 6] The hook-and-loop fastener according to any one of Aspects 1 to 5, wherein ears where no engaging elements are present are present in the length direction and / or width direction of the base fabric.[Aspect 7] A method for producing a hook-and-loop fastener comprising a base fabric formed of thermoplastic resin fibers, the first surface being the front side and the second surface being the back side, a plurality of hook- and / or loop-shaped engaging elements formed from engaging element threads that rise from the first surface of the base fabric and constitute part of the base fabric, and an adhesive resin having a continuous surface and fixing the engaging element threads within the base fabric, wherein the dimensional change rate of at least one of the length and width directions of the hook-and-loop fastener when exposed to 200°C for 24 hours is 5.0% or less (preferably 4.5% or less, more preferably 3.5% or less, and particularly preferably 2.5% or less), the method comprising carrying out the following steps A and B, and if necessary step C, in this order: [Step A] a step of heat-treating a loop base fabric in which threads for engaging elements rise in a loop shape from a first surface of the base fabric under tension at a temperature of at least Tg + 15°C (preferably at least Tg + 50°C, more preferably at least Tg + 70°C, and even more preferably at least Tg + 100°C) which is the glass transition temperature of the thermoplastic resin fiber having the highest glass transition temperature among the thermoplastic resin fibers constituting the loop base fabric; [Step B] a step of applying an adhesive resin to a second surface of the loop base fabric to fix the threads for engaging elements within the base fabric; and [Step C] a step of cutting one leg of the loop to form the hook-shaped engaging element, if a hook-shaped engaging element is to be formed. [Aspect 8] A method for producing a hook-and-loop fastener according to Aspect 7, wherein the tension in Step A is 50 to 600 g / cm (preferably at least 80 to 580 g / cm, and more preferably at least 100 to 550 g / cm). [Aspect 9] A method for manufacturing a hook-and-loop fastener according to Aspect 7 or 8, wherein the heat treatment in step A is carried out for 30 to 120 seconds (preferably 35 to 100 seconds, more preferably 40 to 90 seconds). [Aspect 10] A heat insulating material fastener for fastening a heat insulating material, the heat insulating material fastener comprising the hook-and-loop fastener according to any one of Aspects 1 to 6. [Aspect 11] A heat insulating material comprising the heat insulating material fastener according to Aspect 10. [Aspect 12] A method for fastening a heat insulating material using the heat insulating material fastener according to Aspect 10.

[0013] In this specification, the length direction of the hook-and-loop fastener refers to the longitudinal direction of the hook-and-loop fastener, and the width direction refers to the direction perpendicular to the longitudinal direction.

[0014] It should be noted that any combination of at least two elements disclosed in the claims and / or the specification and / or the drawings is included in the present invention, and in particular any combination of two or more of the claims set forth in the claims is included in the present invention.

[0015] The present invention can provide a hook-and-loop fastener that is advantageous when used at high temperatures (e.g., 50 to 200°C), for example, as a heat insulating material used to insulate pipes, etc., such as a heating jacket.

[0016] The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the examples and drawings are merely for illustration and explanation and should not be used to define the scope of the present invention. The scope of the present invention is determined by the appended claims. Figure 1 is a schematic cross-sectional view illustrating a woven fabric surface fastener having hook-shaped engaging elements according to one embodiment of the present invention. Figure 2 is a schematic cross-sectional view illustrating a woven fabric surface fastener having loop-shaped engaging elements according to one embodiment of the present invention. Figure 3 is a schematic plan view illustrating a surface fastener with ear portions according to one embodiment of the present invention.

[0017] [Method for manufacturing a hook-and-loop fastener] The hook-and-loop fastener is made of a thermoplastic resin fiber and includes a base fabric having a first surface as a front side and a second surface as a back side, and a plurality of hook- and / or loop-shaped engaging elements formed from engaging element threads that rise from the first surface of the base fabric and constitute part of the base fabric. The hook-and-loop fastener can be obtained by carrying out the following steps A and B, and, if necessary, step C, in this order.

[0018] (Step A) In step A, a loop base fabric in which engaging element yarns rise in a loop shape from the first surface of the base fabric is heat-treated under tension at a temperature equal to or higher than the glass transition temperature Tg of the thermoplastic resin fiber having the highest glass transition temperature among the thermoplastic resin fibers constituting the loop base fabric. Here, the base fabric is not limited as long as it can protrude the engaging elements, and may be a woven or knitted fabric or a nonwoven fabric.

[0019] For example, in the case of a woven fabric, the fabric may be made from warp and weft threads composed of thermoplastic resin fibers, and the thread for the engaging element may be woven into the fabric parallel to the warp thread, and after a predetermined number of weft threads have been caused to float and sink, the thread may be made to cross a predetermined number of warp threads, and loops may be formed on the first surface of the fabric at the crossing points, thereby obtaining a loop base fabric in which the thread for the engaging element rises in a loop shape from the first surface of the base fabric.

[0020] The warp preferably contains multifilament yarns, and may be, for example, multifilament yarns consisting of 20 to 70 filaments and having a total decitex (total fineness) of 80 to 300 decitex, or preferably multifilament yarns consisting of 24 to 60 filaments and having a total decitex of 100 to 280 decitex. Note that the thickness (fineness) of the multifilament yarns herein refers to the thickness of the yarns used for weaving.

[0021] The weft preferably contains a multifilament yarn, for example, a multifilament yarn consisting of 20 to 70 filaments and having a total decitex of 80 to 300 decitex, or preferably a multifilament yarn consisting of 24 to 60 filaments and having a total decitex of 100 to 280 decitex. Note that the thickness of the multifilament yarn here refers to the thickness of the yarn used for weaving.

[0022] The weave density of the warp threads in the hook-and-loop fastener may be, for example, 35 to 80 threads / cm, preferably 40 to 70 threads / cm, and the weave density of the weft threads in the hook-and-loop fastener may be, for example, 14 to 21 threads / cm, preferably 15 to 20 threads / cm.

[0023] The fiber that forms the hook-shaped engaging element is preferably a monofilament, more preferably a monofilament having a diameter of 130 to 240 μm. The fiber that forms the loop-shaped engaging element is preferably a multifilament yarn, for example, a multifilament yarn consisting of 40 to 140 filaments and having a total decitex of 160 to 600 decitex, preferably a multifilament yarn consisting of 48 to 120 filaments and having a total decitex of 200 to 560 decitex.

[0024] In the case of knitted fabrics, a knitted fabric (e.g., a tricot knitted fabric) may be produced from knitting yarns made of thermoplastic resin fibers, and the surface of the knitted fabric may be raised with a card cloth or the like to form loops on the surface of the knitted fabric, thereby obtaining a loop base fabric in which the threads for the engaging elements rise in loops from the first surface of the base fabric.

[0025] The knitting yarn is preferably a multifilament yarn, for example, a multifilament yarn consisting of 10 to 300 filaments and having a total decitex of 40 to 300 decitex, or preferably a multifilament yarn consisting of 20 to 250 filaments and having a total decitex of 50 to 280 decitex. Note that the thickness (fineness) of the multifilament yarn here refers to the thickness of the yarn used for knitting.

[0026] In the case of a nonwoven fabric, a web may be obtained from cut fibers made of thermoplastic resin fibers, entangled by needle punching or the like, and if necessary, raised on its surface to obtain a loop base fabric in which the engaging element threads stand up in loops from the first surface of the base fabric. Alternatively, a spunbond nonwoven fabric may be obtained from long fibers made of thermoplastic resin fibers, and the surface may be raised to obtain a loop base fabric in which the engaging element threads stand up in loops from the first surface of the base fabric.

[0027] The length of the cut fibers may be, for example, 30 to 80 mm, preferably 40 to 70 mm. The thickness of the cut fibers may be, in terms of single filament fineness, for example, 1 to 50 decitex, preferably 1.5 to 40 decitex. The thickness of the fibers constituting the spunbonded nonwoven fabric may be, in terms of single filament fineness, for example, 1 to 50 decitex, preferably 1.5 to 40 decitex.

[0028] The loop base fabric thus obtained may be made of a single type of fiber or may be made of multiple types of fibers.

[0029] The fibers are spun from a fiber-forming thermoplastic resin, and examples of such thermoplastic resins include polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate; polyamide-based resins such as polyamide 6 and polyamide 6,6; polyphenylene sulfide-based resins; polyether ether ketone-based resins; polyetherimide-based resins; polyamideimide-based resins; and liquid crystal polyester resins. From the viewpoint of excellent heat resistance, polyphenylene sulfide-based resins, polyether ether ketone-based resins, polyetherimide-based resins, polyamideimide-based resins, and liquid crystal polyester resins are preferred. In particular, from the viewpoint of excellent flame retardancy, heat resistance, and insulation, fibers formed from polyphenylene sulfide-based resins (polyphenylene sulfide fibers) are preferred. The fibers spun from the fiber-forming resin may be composite fibers, but non-composite fibers are preferred.

[0030] The obtained loop fabric is subjected to a heat treatment step. In the heat treatment step, the loop fabric is heated under tension at a temperature equal to or higher than the glass transition temperature Tg of the thermoplastic resin fiber having the highest glass transition temperature among the thermoplastic resin fibers constituting the loop fabric. The glass transition temperature of the thermoplastic resin fiber can be measured using a differential scanning calorimeter (Mettler "TA3000-DSC") in a nitrogen atmosphere by heating to 400°C at a heating rate of 50°C / min. The glass transition temperature can be calculated from the inflection point on the DSC chart in accordance with JIS K 7121.

[0031] By carrying out the heat treatment step, it is possible to prevent the loop base fabric from shrinking when the hook-and-loop fastener is in use, even when it is exposed to high temperatures, for example, around 200° C. Furthermore, it is possible to maintain the shape of the hook-shaped engaging elements, and it is possible to prevent a decrease in the engaging force.

[0032] The heating temperature in the heat treatment step may be equal to or higher than the glass transition temperature (Tg) + 15° C., and is preferably equal to or higher than Tg + 50° C., more preferably equal to or higher than Tg + 70° C., and even more preferably equal to or higher than Tg + 100° C. When the thermoplastic resin fiber is made of a crystalline thermoplastic resin such as polyphenylene sulfide resin (PPS), the upper limit is not particularly limited as long as it is lower than the melting point of the resin, and may be, for example, equal to or lower than Tg + 180° C.

[0033] Furthermore, when the loop base fabric is subjected to a continuous heat treatment, the tension applied to the loop base fabric may be, for example, 50 to 600 g / cm, preferably 80 to 580 g / cm, and more preferably 100 to 550 g / cm. The direction in which the tension is applied is not particularly limited and may be the machine direction (the length direction of the loop base fabric), the direction perpendicular to the machine direction (the width direction of the loop base fabric), or both. Applying tension to the loop base fabric in the above process not only suppresses waving of the loop base fabric when an adhesive resin is applied in step B, thereby improving processability, but also suppresses excessive shrinkage, ensures gaps for the adhesive resin to penetrate, and improves processability of the loop base fabric during aging treatment, etc. Furthermore, when the hook-and-loop fastener is used at high temperatures of about 200°C, shrinkage of the hook-and-loop fastener and waviness of the surface can be prevented. This is preferable. When the thermoplastic resin fibers constituting the base fabric are made of crystalline thermoplastic resin, by carrying out the heat treatment process at the above tension, the crystallinity of not only the threads for the engaging elements of the hook-and-loop fastener but also the thermoplastic resin fibers constituting the base fabric can be made 25 to 60%, more preferably 30 to 55%, and even more preferably 35 to 50%, which can contribute to suppressing shrinkage at high temperatures and maintaining the shape.

[0034] The heat treatment time may be, for example, 30 to 120 seconds, preferably 35 to 100 seconds, and more preferably 40 to 90 seconds.

[0035] Furthermore, by carrying out the heat treatment step, the tensile modulus of the hook-and-loop fastener can be set to 3500 to 7500 N, preferably 4000 to 7000 N, and more preferably 4500 to 6500 N, which can contribute to suppressing shrinkage at high temperatures, maintaining the shape, and maintaining the engaging force when exposed to high temperatures. Here, the tensile modulus of the hook-and-loop fastener is a value measured by the method described in the examples below.

[0036] (Step B) Next, an adhesive resin is applied to the second surface of the heat-treated loop base fabric to fix the engaging element yarn within the base fabric. When forming loop-shaped engaging elements, a step of loosening the multifilaments forming the loop-shaped engaging elements may be performed after fixation. In particular, by fixing the exposed fabric constituent yarns and the engaging element yarns on the second surface of the loop base fabric with an adhesive resin, and between the fibers constituting the base fabric and the engaging element yarns, and even between the base fabric and the engaging element yarns, the heat-treated loop base fabric and the engaging element yarns are firmly fixed together, resulting in a hook-and-loop fastener that is excellent for use at high temperatures. It goes without saying that the method of fixing the engaging element yarns using heat-sealable shrinkable fibers primarily as a portion of the weft yarns, as in Patent Document 1, is unable to fix the exposed surface of the engaging element yarns on the second surface of the loop base fabric with heat-sealable fibers. Furthermore, in the present invention, since clogging of the base fabric can be suppressed in step A, the adhesive resin can be sufficiently penetrated between the fibers of the yarns constituting the loop base fabric, further reinforcing the effects of the present invention.

[0037] The adhesive resin used is not particularly limited as long as it can fix the engaging element thread. Examples include thermoplastic resins such as polyurethane, acrylic resins (e.g., acrylic ester resins), polyvinyl chloride, vinyl acetate resins, styrene-butadiene resins, polyester, and thermoplastic elastomers, as well as thermosetting resins such as crosslinked polyurethane resins, crosslinked acrylic resins, epoxy resins, unsaturated polyester resins, vinyl ester resins, crosslinked polyamide resins, phenolic resins, natural rubber, isoprene rubber, and silicone rubber. These adhesive resins may be used alone or in combination. Of these, preferred thermoplastic resins are polyurethane and / or acrylic ester resins, while examples of thermosetting resins include crosslinked polyurethane resins, crosslinked polyesters, epoxy resins, crosslinked acrylic resins, and crosslinked copolymerized nylon resins. These may be used alone or in combination. More preferred are polyurethane resins having a crosslinked structure and acrylic ester resins having a crosslinked structure, as they maintain the suppression of shrinkage of the loop base fabric and the suppression of waving of the hook-and-loop fastener, even when exposed to high temperatures of around 200°C. A polyurethane resin or acrylic ester resin having a crosslinked structure can be obtained, for example, by crosslinking molecules together or by using a crosslinking agent monomer (e.g., an isocyanate-based curing agent) or the like to form a network structure through crosslinking between molecules. There are no particular limitations on the type of crosslinked polyurethane resin or acrylic ester resin, and any known crosslinked polyurethane resin or acrylic ester resin can be used.

[0038] These adhesive resins may be applied directly to the second surface of the loop base fabric as a melted adhesive resin, or may be applied to the second surface of the loop base fabric as a backcoat liquid in the form of a solution or dispersion using a diluent appropriate for the adhesive resin.

[0039] For example, when applying a molten adhesive resin, the extruded molten adhesive resin can be pressed against the second surface of the loop base fabric using a press roll, causing the molten adhesive resin to penetrate into the base fabric from the second surface of the base fabric, integrating the two and fixing the engaging element thread present in the base fabric within the base fabric.

[0040] In addition, when using a backcoat liquid prepared as a solution or dispersion using a diluent (e.g., water, alcohols, esters, ethers, etc.) appropriate for the adhesive resin, the backcoat liquid may be applied to the second surface of the loop base fabric to fix the engaging element thread present within the base fabric.

[0041] The adhesive resin and / or the backcoat liquid may contain various additives as needed, such as flame retardants, heat stabilizers, antioxidants, antistatic agents, coloring inhibitors, matting agents, radical inhibitors, colorants, fluorescent brighteners, and antibacterial agents.

[0042] Examples of the flame retardant include halogen-based flame retardants, phosphorus-based flame retardants, silicon-based flame retardants, and nitrogen-based flame retardants, which may be used alone or in combination of two or more.

[0043] Examples of halogen-based flame retardants include chlorinated paraffin, chlorinated polyethylene, bromine-containing acrylic resins, bromine-containing styrene-based resins, bromine-containing epoxy compounds, bromine-containing aryl ether compounds, bromine-containing aromatic imide compounds, and brominated bisaryl compounds, with brominated bisaryl compounds being preferred, and 1,2-bis(pentabromophenyl)ethane being particularly preferred. Furthermore, halogen-based flame retardants (particularly bromine-based flame retardants) are preferably used in combination with antimony trioxide, and commercially available antimony trioxide can be used as is, preferably with a particle size of 0.3 to 2 μm.

[0044] Examples of phosphorus-based flame retardants include triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, trixylenyl phosphate, cresyl di-2,6-xylenyl phosphate, 2-ethylhexyl diphenyl phosphate, trimethyl phosphate, triethyl phosphate, tris(2-ethylhexyl)phosphate, resorcinol bis(diphenyl phosphate), bisphenol A bis(diphenyl phosphate), resorcinol bis(di-2,6-xylenyl phosphate), tris(chloroethyl)phosphate, tris(chloroethyl)phosphate, phosphoric acid ester compounds such as dimethylmethylphosphonate, dimethylvinylphosphonate, diethylvinylphosphonate, diphenylvinylphosphonate, etc.; phosphinate metal salt compounds such as diethylphosphinate metal salt; phosphazene compounds; red phosphorus; phosphate compounds such as ammonium phosphate, guanidine phosphate, guanylurea phosphate, melamine phosphate, etc.; polyphosphate compounds such as ammonium polyphosphate, melamine polyphosphate, etc.

[0045] Examples of silicon-based flame retardants include silicone compounds.

[0046] Examples of nitrogen-based flame retardants include guanidine-based compounds such as guanidine sulfamate; triazine-based compounds such as melamine sulfate, melamine cyanurate, melam, and melem; hindered amine-based compounds; and azoalkane-based compounds.

[0047] For example, when a flame retardant is selected in accordance with the fibers constituting the base fabric, the flame retardancy of the hook-and-loop fastener can be efficiently improved. Examples of such flame retardants include halogen-based flame retardants, phosphorus-based flame retardants, and nitrogen-based flame retardants, which may be used alone or in combination of two or more.

[0048] If necessary, the applied adhesive resin is dried. The drying temperature can be appropriately set depending on the type of adhesive resin and the type of diluent, and may be, for example, 40 to 150°C, preferably 50 to 130°C, and more preferably 60 to 120°C. The drying time can be appropriately set depending on the drying temperature, and may be, for example, 30 seconds to 5 minutes, preferably 50 seconds to 4 minutes, and more preferably 1 to 3 minutes.

[0049] In addition to or instead of the drying step, an aging treatment may be performed as necessary. By performing the aging treatment, moisture can be removed and crosslinking of the thermosetting resin can be promoted and cured. The aging treatment conditions may be, for example, in an atmosphere of 60 to 100°C, preferably 70 to 90°C, for 1 to 24 hours, preferably 2 to 15 hours.

[0050] From the viewpoint of controlling the permeability of the adhesive resin, the amount of adhesive resin to be applied is, for example, 40 to 400 g / m in terms of solid content when a molten adhesive resin is applied. ２ , preferably 50 to 380 g / m ２ , more preferably 60 to 340 g / m ２ In addition, when a backcoat liquid is applied, the amount is, for example, 10 to 200 g / m in terms of solid content. ２ , preferably 15 to 180 g / m ２ , more preferably 20 to 150 g / m ２ may be.

[0051] (Step C) Step C is a step that is carried out only when a hook-like engaging element is formed, and involves cutting one leg of the loop of the loop base fabric obtained in step B to form the loop into a hook-like engaging element. Cutting the leg of the loop can be carried out by a known or conventional method.

[0052] [Hook-and-loop fastener] The present invention provides a hook-and-loop fastener comprising a base fabric formed of thermoplastic resin fibers, with a first surface as the front side and a second surface as the back side, a plurality of hook-shaped and / or loop-shaped engaging elements formed from engaging element threads that rise from the first surface of the base fabric and constitute part of the base fabric, and an adhesive resin having a continuous surface and fixing the engaging element threads within the base fabric, wherein the dimensional change rate of the hook-and-loop fastener in at least one of the length and width directions is 5.0% or less when exposed to 200°C for 24 hours.

[0053] The dimensional change rate of the hook-and-loop fastener in at least one of the length and width directions (preferably the length direction, more preferably the length and width directions) when exposed to 200°C for 24 hours may be preferably 4.5% or less, more preferably 3.5% or less, and particularly preferably 2.5% or less. Here, the dimensional change rate is a value measured by the method described in the examples below.

[0054] Furthermore, from the viewpoint of accurately grasping the dimensional change rate, the width of the hook-and-loop fastener may be, for example, 20 mm or more, preferably 25 mm or more, and more preferably 30 mm or more. The upper limit of the width of the hook-and-loop fastener is not particularly limited, but may be, for example, 300 mm or less. Furthermore, for example, when used as a fastener for a heating jacket, the width of the hook-and-loop fastener may be, for example, 20 mm or more, preferably 25 mm or more, and more preferably 30 mm or more, due to the synergistic effect of suppressing wrinkles and gaps and stabilizing the heat retention and heating effect. If it is less than 20 mm, the engagement area will be small, and the heat retention and heating effect may lack stability. Note that the width of the hook-and-loop fastener is the width measured based on the base fabric, and includes the ears, if any, described below.

[0055] In the case where the thermoplastic resin fiber constituting the base fabric of the hook-and-loop fastener is made of a crystalline thermoplastic resin, the degree of crystallinity of the thermoplastic resin fiber may be 25 to 60%, more preferably 30 to 55%, and even more preferably 35 to 50%. By setting the degree of crystallinity within the above range, it is possible to contribute to suppressing shrinkage at high temperatures and maintaining the shape.

[0056] The tensile modulus of the hook-and-loop fastener may be 3500 to 7500 N, preferably 4000 to 7000 N, and more preferably 4500 to 6500 N. By setting the tensile modulus within the above range, it is possible to contribute to suppressing shrinkage at high temperatures, maintaining the shape, and maintaining the engaging force when exposed to high temperatures.

[0057] As described above, the base fabric may be a woven fabric, a knitted fabric, or a nonwoven fabric, but the following description will be given using a woven fabric as an example. Note that even if the base fabric is not a woven fabric, the height and density of the engaging elements may be the same as those of a woven fabric.

[0058] Fig. 1 is a diagram showing a cross section of a woven hook surface fastener, which is an example of a woven surface fastener. Fig. 2 is a diagram showing a cross section of a woven loop surface fastener, which is another example of a woven surface fastener. In both diagrams, the cross section is taken parallel to the warp threads and at a location where the warp threads extend, and the engaging element threads are present at the back of the cross section.

[0059] As shown in Figure 1, in a woven hook surface fastener, the first surface side of the base fabric (5) is on top and the second surface side is on the bottom, and the base fabric (5) is formed by weft threads (1) at the center and warp threads (2) rising and falling above and below it.

[0060] 1, the threads for the engaging elements woven into the base fabric (5) parallel to the warp threads (2) also rise and fall above and below the weft threads (1) in the same manner as the warp threads (2). Therefore, when the threads for the engaging elements are present below the weft threads (1), there are places where the threads for the engaging elements are exposed on the second surface of the base fabric (5). Therefore, the base fabric (5) is composed of the warp threads (2), the weft threads (1), and the threads for the engaging elements. The threads for the engaging elements rise regularly in places on the first surface of the base fabric (5) as hook-shaped engaging elements (3).

[0061] As shown in Figure 2, in the woven loop hook-and-loop fastener, the first surface side of the base fabric (5) is on top and the second surface side is on the bottom, and the warp threads (2) rise and fall above and below the weft thread (1) at the center to form the base fabric (5).

[0062] Although not shown in Figure 2, the engaging element yarns woven into the base fabric (5) parallel to the warp yarns (2) also rise and fall above and below the weft yarn (1), similar to the warp yarns (2). Therefore, when the engaging element yarns are present below the weft yarn (1), there are places where the engaging element yarns are exposed on the second surface of the base fabric (5). Therefore, the base fabric (5) is composed of the warp yarns (2), the weft yarns (1), and the engaging element yarns. The engaging element yarns rise regularly in places as loop-shaped engaging elements (4) on the first surface side of the base fabric (5). In Figure 2, the loop-shaped engaging elements (4) have the multifilament yarn bundles loosened at the loop portions to increase the possibility of engaging with the hook-shaped engaging elements.

[0063] In Figures 1 and 2, the weft yarn (1), warp yarn (2), and yarn for the loop-shaped engaging element are made of multifilament yarn (in Figures 1 and 2, the warp yarn (2) is shown as one yarn, but in reality it is an aggregate of many thin filament yarns), and the yarn for the hook-shaped engaging element is made of monofilament yarn.

[0064] Furthermore, the number of threads of the monofilament yarn for the hook-shaped engaging element and the multifilament yarn for the loop-shaped engaging element is preferably, for example, 2 to 7, and preferably 3 to 6, per 20 warp threads (including the monofilament yarn for the hook-shaped engaging element and the multifilament yarn for the loop-shaped engaging element) in terms of engaging force. In the case of a hook-loop coexisting type surface fastener, the number of threads of the monofilament yarn for the hook-shaped engaging element and the multifilament yarn for the loop-shaped engaging element is preferably, for example, 2 to 7, and preferably 3 to 6, per 20 warp threads (including the monofilament yarn for the hook-shaped engaging element and the multifilament yarn for the loop-shaped engaging element) in total for the same reasons.

[0065] In the hook-and-loop fastener, the height of the hook-shaped engaging elements, as the height protruding from the first surface of the base fabric, may be, for example, 1.2 to 2.5 mm, preferably 1.4 to 2.3 mm. Also, the height of the loop-shaped engaging elements, as the height protruding from the first surface of the base fabric, may be, for example, 1.2 to 3.0 mm, preferably 1.5 to 2.7 mm. Here, the height is a value measured by the method described in the examples below.

[0066] The density of the hook-shaped engaging elements in the hook surface fastener is 30 to 70 pieces / cm based on the base fabric portion where the engaging elements are present. ２ The density of the loop-shaped engaging elements in the loop surface fastener is 30 to 70 pieces / cm according to the same standard. ２ The total density of the hook-shaped engaging elements and the loop-shaped engaging elements in the hook-loop coexisting surface fastener is 30 to 70 pieces / cm according to the same standard. ２ In the hook-and-loop coexisting surface fastener, 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. Note that the base fabric portion standard here is based on the unit area of ​​the base fabric of the surface fastener in a state where the adhesive resin has been applied.

[0067] The adhesive resin (7) is applied from the second surface side of the base fabric (5) and has a continuous area, which can fix the engaging element threads within the base fabric. For example, the adhesive resin (7) forms a continuous adhesive surface on the second surface side, and can fix the threads constituting the base fabric (5) at the portions that contact the adhesive surface. Note that, in the present invention, the "continuous area" refers to an area formed continuously on the second surface side of the base fabric. It is not necessary to cover the entire second surface. As long as the effects of the present invention are achieved, there may be areas where the adhesive resin is not applied, or the adhesive resin may have irregularities corresponding to the shape of the second surface. In Figures 1 and 2, the adhesive resin (7) is shown attached to the second surface side of the base fabric (5), but this is not limited thereto. The adhesive resin may also penetrate into the warp, weft, or engaging element threads constituting the second surface, and even into the interior of the woven fabric.

[0068] From the viewpoint of increasing the area in contact with the yarn and improving adhesion, it is preferable that the adhesive resin penetrates at least a part of the base fabric. In this case, the adhesive resin may have a planar continuous portion and may penetrate into the interior of the base fabric depending on the shape of the base fabric. In the portion that penetrates into the interior of the base fabric, the adhesive resin may have a portion that penetrates further into the interior of the base fabric from the planar continuous portion.

[0069] When the adhesive resin penetrates into the base fabric, it is preferable that the amount of adhesive resin that penetrates into the engaging elements be small. For example, the amount of adhesive resin that penetrates into the engaging elements (the penetration rate into the engaging elements) is, for example, 50% or less, preferably 40% or less, based on the height from the first surface of the base fabric to the top of the engaging elements (100%) in the protruding direction of the engaging elements. In particular, in the case of loop hook-and-loop fasteners, the resin penetrates into the engaging elements from the first surface of the base fabric at a rate of more than 35% or less, and even more preferably 20% or less. This makes it difficult for the fibers that make up the loop to be bundled and fixed by the adhesive resin, and promotes the individual loosening of the multifilament fibers that make up the loop. As a result, many of the fibers that make up the loop are more likely to be caught by the hook-shaped engaging elements, preventing a decrease in the engaging force. Here, the resin penetration height is a value measured using the method described in the Examples section below.

[0070] The base fabric may have engaging elements formed over the entire first surface. Alternatively, the base fabric may have selvedge portions in the length direction and / or width direction on the first surface. Here, selvedge portions refer to areas where engaging elements are not present and are adjacent to areas where engaging elements are present. The selvedge portions may be present at both ends and / or inside the hook-and-loop fastener.

[0071] Fig. 3 is a schematic plan view of one embodiment of a hook-and-loop fastener having ears. As shown in Fig. 3, the hook-and-loop fastener (10) is a hook-and-loop fastener in which each engaging element region (8) is divided by a plurality of middle ear regions (6b) formed parallel to the warp direction (Wa). At both ends of the hook-and-loop fastener (10), there are outer ear regions (6a) formed parallel to the warp direction (Wa).

[0072] By slitting the inner ear region (6b) of the hook-and-loop fastener (10), multiple hook-and-loop fasteners, the number of which corresponds to the number of engaging element regions (8), may be produced from a single hook-and-loop fastener (10). In this case, each cut hook-and-loop fastener has ears at both ends parallel to the warp direction (Wa). The hook-and-loop fastener of the present invention has excellent dimensional stability when heated, so even when the ears are present, the dimensional stability of the entire hook-and-loop fastener can be maintained. The presence of ears has the advantage that, for example, when attaching to an insulating material such as a heating jacket, the boundaries between the ears and the engaging element portions serve as markers for easy sewing. Furthermore, sewing the engaging element portions can cause the elements to collapse at the sewn locations, resulting in a poor appearance, or wrinkles due to gaps in the sewn locations, reducing the effectiveness of the heating jacket. However, sewing the ears can improve the appearance due to the collapsed elements and prevent wrinkles due to gaps.

[0073] For example, the width of the outer ear region (6a) in the weft direction (We) is preferably 0.5 to 4 mm, more preferably 1 to 3 mm, and the width of the middle ear region (6b) in the weft direction (We) after contraction is preferably 1 to 8 mm, more preferably 2 to 6 mm. It is preferable that the middle ear region (6b) divides the engaging element region (8) into multiple regions in the weft direction (We) with a width of 10 to 50 mm. It is particularly preferable that the engaging element region (8) be divided into multiple regions with a width of 15 to 30 mm by the middle ear region (6b). The width of the outer ear region (6a) in the weft direction (We) is preferably half the width of the middle ear region (6b) in the weft direction (We).

[0074] From the viewpoint of productivity, the overall width of the woven fabric in the weft direction (We) before slitting the middle ear region (6b) is preferably in the range of 80 to 300 mm. Therefore, it is preferable that the engaging element region (8) is divided into 2 to 12 regions by the middle ear region (6b). Furthermore, from the viewpoint of flexibility of the hook-and-loop fastener, it is preferable that no engaging element threads are woven into the middle ear region (6b). Here, the width of each region is based on the base fabric of the hook-and-loop fastener when the adhesive resin is applied.

[0075] The hook-and-loop fastener of the present invention has excellent dimensional stability at high temperatures (e.g., 200°C), and therefore can be used in a wide range of fields, including vehicles such as automobiles, aircraft, and trains, specialized clothing such as fire-resistant clothing, fire-fighting clothing, and high-temperature work clothing, and industrial materials such as heat insulation materials and building materials.

[0076] In particular, any of the above-mentioned hook-and-loop fasteners is suitable for use as a fastener for a heat insulating material such as a heating jacket. For example, a heating jacket is a heat insulating material used to insulate an extruder or injection molding machine cylinder, a reactor, and various pipes used therein, and since it is used at high temperatures for a long period of time, the fastener is required to have dimensional stability and fixing force at high temperatures.

[0077] For example, the heat insulating material fastener may be a heat insulating material fastener including any of the hook-and-loop fasteners described above. Such a heat insulating material fastener may include a support body and, if necessary, other fixing members (for example, point fasteners, line fasteners, etc.).

[0078] The present invention may further include a method for fixing a thermal insulator using the thermal insulator fastener described above. The fixing method includes the steps of covering an object to be insulated (such as a pipe) with one or more thermal insulators equipped with the thermal insulator fasteners, and fixing the one or more thermal insulators with the thermal insulator fasteners having an engaging force with each other so as to maintain the covered state.

[0079] The present invention may further include a thermal insulation material equipped with the above-mentioned thermal insulation material fastener. Because the hook-and-loop fastener of the present invention has excellent dimensional stability and engaging force at high temperatures, a thermal insulation material equipped with such a hook-and-loop fastener can not only suppress deformation caused by the shrinkage of the hook-and-loop fastener when used at high temperatures, but also prevent a decrease in the covering ability of the thermal insulation material due to a deterioration in the engaging force. In particular, when the hook-and-loop fastener is sewn to the fabric portion of the thermal insulation material, deformation of the fabric portion of the thermal insulation material due to the shrinkage of the hook-and-loop fastener can be suppressed.

[0080] The present invention will be described in more detail below with reference to examples, but the present invention is not limited by these examples. In the following examples and comparative examples, various physical properties were measured by the following methods.

[0081] (Engagement Force) The tensile shear strength (shear) and peel strength (peel) of the obtained samples were measured in accordance with JIS L 3416-2000. The engagement force was measured for the initial engagement force before heating and for the engagement force after heating for 24 hours in an atmosphere set at 200°C using a baking machine (industrial thermostatic oven).

[0082] (Height of engaging element from the surface of the backing fabric) Regarding the height of the engaging element from the surface of the backing fabric of the obtained sample, the distance from the base of the engaging element on the first surface of the backing fabric to the apex of the engaging element was measured. The measurement was carried out for 10 randomly selected engaging elements, and the average value was calculated.

[0083] (Permeation rate into engaging elements) Observation was performed using a microscope (manufactured by Keyence Corporation) to measure the distance that the adhesive resin penetrated into the engaging elements from the first surface of the base fabric, and the permeation rate of the adhesive resin into the engaging elements was calculated using the height of the engaging elements from the above-mentioned base fabric surface as the reference (100%). Measurement was performed on 10 randomly selected engaging elements, and the average value was calculated.

[0084] (Average fiber diameter) The average fiber diameter of the obtained sample yarn for hook-shaped engaging elements was measured by observing each fiber with a microscope (manufactured by Keyence Corporation). The measurement was carried out on 10 randomly selected engaging elements, and the average value was calculated.

[0085] (Degree of Crystallinity) Using an X-ray diffractometer (SWXD-FK) manufactured by Rigaku Corporation, X-ray diffraction of the woven fabric was performed under conditions of a voltage of 20 kV, a current of 10 mA, and an irradiation time of 20 minutes, and the degree of crystallinity (%) was calculated using analysis software: JADA6 according to the formula: Crystallinity (%) = Crystalline peak area / Total peak area × 100.

[0086] (Tensile modulus) With reference to JIS L 1096 8.14 (tensile strength and elongation), a hook-and-loop fastener cut to a length (warp direction) of 250 mm and having a width of 25 mm (weft direction) was pulled at a chuck distance of 200 mm and a pulling speed of 200 mm / min using a desktop precision universal testing machine manufactured by Shimadzu Corporation. The straight line connecting the two points of 1% and 3% strain on the obtained SS curve was extended, and the vertical axis strength value at a horizontal axis strain of 100% on the straight line was obtained.

[0087] (Dimensional Change Rate) The obtained samples were adjusted and calculated to calculate the dimensional change rate with reference to JIS L 1096:2010 (Testing Methods for Woven and Knit Fabrics) and JIS L 1909:2010 (Method for Measuring Dimensional Change in Textile Products). The sample hook-and-loop fasteners were prepared with a width of 25 mm and a length of 1 m. They were heated in a baking machine (industrial incubator) at a set temperature of 200°C for 24 hours, then removed, and the dimensional change rate (%) of the samples was calculated using the following formulas: Dimensional change rate (length) = (length before heating - length after heating) / (length before heating) x 100 Dimensional change rate (width) = (width before heating - width after heating) / (width before heating) x 100 For convenience, the sample hook-and-loop fasteners were prepared with a width of 25 mm and a length of 1 m. However, the width and length are not particularly limited as long as they are measurable.

[0088] (Evaluation of the Shape of Hook-Like Engagement Elements) A sample hook-and-loop fastener was placed in a baking machine (industrial incubator) and heated for 24 hours in an atmosphere set at 200°C, and then removed and the hook-like shapes of the hook-like engagement elements were visually confirmed. The change in the hook-like shapes of the hook-like engagement elements was then visually evaluated according to the following criteria, using the same hook-and-loop fastener as the sample that had been stored in an environment at a temperature of 20°C and a humidity of 65% as a comparison, to see how the hook-like shapes of the blanks had changed. The evaluation was made in comparison with the comparison hook-and-loop fastener.

[0089] A: The hook shape is about the same as that of the comparative surface fastener, and the curve of the hook shape of the hook-shaped engaging element is maintained. B: The hook shape of the hook-shaped engaging element is maintained, but the curve of the hook shape is slightly gentler compared to the hook shape of the comparative surface fastener. C: The hook shape of the hook-shaped engaging element is no longer maintained, and is significantly different from the hook shape of the comparative surface fastener.

[0090] (Evaluation when attached to a heating jacket) A sample hook-and-loop fastener having a hook-like engaging element was attached by sewing to a glass cloth that generally constitutes a heating jacket, and a hook-and-loop fastener having a loop-like engaging element was also attached by sewing, and then they were engaged with each other. In this state, the heating jacket was placed in a baking machine (industrial thermostatic oven) and heated for 24 hours in an atmosphere set at a temperature of 200°C. After heating, the engaging elements attached to the heating jacket were removed from the baking machine and visually evaluated according to the following criteria to see whether the loop-like engaging element and the hook-like engaging element maintained their shape.

[0091] A: The overall engagement of the hook-and-loop fastener is maintained, and there is no disengagement between the engaging elements. B: The overall engagement of the hook-and-loop fastener is maintained, but there is partial disengagement between the engaging elements. C: The hook-and-loop fastener does not maintain overall engagement.

[0092] In addition, when the hook-and-loop fastener shrinks due to heating, the shrinkage causes the fabric of the heating jacket to distort and wrinkle, so we visually evaluated whether the fabric of the heating jacket in the area where the hook-and-loop fastener was attached to see if it warped or not, using the following criteria.

[0093] A: Almost no distortion or wrinkles. B: Some distortion or wrinkles. C: Some distortion or wrinkles.

[0094] (Example 1) The following yarns were prepared as the warp yarns, weft yarns, and monofilament yarns for the hook-shaped engaging elements that constitute the base fabric of the heat-resistant hook surface fastener. [Warp yarn] Multifilament yarn made of PPS Total decitex and number of filaments: 172 dtex and 50 Here, the glass transition temperature of PPS (polyphenylene sulfide) is 90°C, which is common to the following yarns.

[0095] [Weft] Multifilament yarn made of PPS Total decitex and number of filaments: 172 dtex and 50

[0096] [Monofilament thread for hook-shaped engaging element] Monofilament thread made of PPS Diameter (before heat shrinkage): 200 μm

[0097] [Manufacturing of Hook Surface Fastener] Using the above warp yarns, weft yarns and monofilament yarns for hook-shaped engaging elements, a plain weave was used as the weave structure, and the monofilament yarns for hook-shaped engaging elements were woven in parallel to the warp yarns at a ratio of 1 for every 4 warp yarns so that the weave density was 48.5 warp yarns / cm and 16.0 weft yarns / cm, and a loop was formed on the base fabric at the point where the monofilament yarns for hook-shaped engaging elements were woven in parallel to the warp yarns at a ratio of 1 for every 4 warp yarns, after floating and sinking three weft yarns, the monofilament yarns were then crossed over three warp yarns, and a loop was then formed on the base fabric at the point where the monofilament yarns crossed over one weft yarn.

[0098] The hook surface fastener tape woven under the above conditions was subjected to heat treatment by running it through a heat treatment furnace at 200°C for 60 seconds (tension in the longitudinal direction: 200 g / cm), thereby heat-treating the warp yarns, weft yarns, and monofilament yarns for the hook-shaped engaging elements.

[0099] Then, a mixed liquid of cross-linked polyurethane resin and acrylic resin (diluent: water) was applied to the back surface of this hook surface fastener as a backcoat liquid, dried at 140°C for 90 seconds, and then aged at 80°C for 9 hours to complete the cross-linking.

[0100] Next, one leg of the loop for the hook-shaped engaging element was cut using a cutting device that has a structure in which cutting is performed by the reciprocating motion of a movable cutting blade between two fixed blades, to obtain a hook-shaped engaging element. The element density was 54 pieces / cm. ２ The physical properties of the resulting hook surface fastener are shown in Table 1.

[0101] (Example 2) The following yarns were prepared as warp yarns, weft yarns, and yarns for loop-shaped engaging elements constituting the base fabric of the loop surface fastener. [Warp yarns] Multifilament yarns made of PPS Total decitex and number of filaments: 172 dtex and 50 filaments

[0102] [Weft] Multifilament yarn made of PPS Total decitex and number of filaments: 172 dtex and 50

[0103] [Thread for loop-shaped engaging element] Multifilament thread made of PPS Total decitex and number of filaments: 344 dtex and 100 filaments

[0104] [Manufacturing of Loop Hook and Loop Fastener] Using the above warp yarns, weft yarns and loop-shaped engaging element yarns, a plain weave was used as the weave structure, and the monofilament yarns for the loop-shaped engaging elements were woven parallel to the warp yarns at a ratio of 1 for every 4 warp yarns so that the weave density was 43.6 warp yarns / cm and 18.7 weft yarns / cm. After three weft yarns were allowed to float and sink, the monofilament yarns were allowed to cross over three warp yarns, and a loop was formed on the base fabric at the point where three weft yarns were crossed.

[0105] The loop hook-and-loop fastener tape woven under the above conditions was subjected to heat treatment by running it through a heat treatment furnace at 200°C for 60 seconds (tension in the longitudinal direction: 200 g / cm), thereby heat-treating the warp yarns, weft yarns, and loop-shaped engaging element yarns.

[0106] A mixed solution of cross-linked polyurethane resin and acrylic resin (diluent: water) was applied as a backcoat liquid to the back surface of this loop surface fastener, dried at 140°C for 90 seconds, and then aged at 80°C for 9 hours to complete the cross-linking. The element density was 62 pieces / cm. ２ The physical properties of the obtained loop surface fastener are shown in Table 1. The hook surface fastener obtained in Example 1 and the loop surface fastener obtained in Example 2 were combined to measure various engagement forces.

[0107] (Example 3) The warp density of Example 1 was changed to 48.5 threads / cm, the weft density to 16.0 threads / cm, the heat treatment temperature was changed to 250°C, and the element density was changed to 55 pieces / cm. ２ Except for the above, the hook-shaped engaging elements were formed in the same manner as in Example 1. The physical properties of the obtained hook surface fastener are shown in Table 1.

[0108] (Example 4) The warp density of Example 2 was changed to 43.6 threads / cm, the weft density to 18.7 threads / cm, the heat treatment temperature was changed to 250°C, and the element density was changed to 64 elements / cm. ２ Except for this, a loop-shaped engaging element was formed in the same manner as in Example 2. The physical properties of the obtained loop surface fastener are shown in Table 1. In addition, the hook surface fastener obtained in Example 3 and the loop surface fastener obtained in Example 4 were combined to measure various engaging forces.

[0109] (Example 5) The warp density of Example 1 was changed to 48.5 threads / cm, the weft density to 16.0 threads / cm, the heat treatment temperature was changed to 140°C, and the element density was changed to 52 pieces / cm. ２ Except for the above, the hook-shaped engaging elements were formed in the same manner as in Example 1. The physical properties of the obtained hook surface fastener are shown in Table 1.

[0110] (Example 6) The warp density of Example 2 was changed to 43.6 threads / cm, the weft density to 18.7 threads / cm, the heat treatment temperature was changed to 140°C, and the element density was changed to 60 pieces / cm. ２ Except for this, a loop-shaped engaging element was formed in the same manner as in Example 2. The physical properties of the obtained loop surface fastener are shown in Table 1. In addition, the hook surface fastener obtained in Example 5 and the loop surface fastener obtained in Example 6 were combined to measure various engaging forces.

[0111] Comparative Example 1 Hook-shaped engaging elements were formed in the same manner as in Example 5, except that the heat treatment in Example 5 was not carried out. Table 1 shows the physical properties of the obtained hook surface fastener.

[0112] (Comparative Example 2) A loop-shaped engaging element was formed in the same manner as in Example 6, except that the heat treatment in Example 6 was not carried out. The physical properties of the obtained loop surface fastener are shown in Table 1. In addition, the hook surface fastener obtained in Comparative Example 1 and the loop surface fastener obtained in Comparative Example 2 were combined and various engaging forces were measured.

[0113] Comparative Example 3 Hook-shaped engaging elements were formed in the same manner as in Example 5, except that the heat treatment in Example 5 was carried out at 100° C. Table 1 shows the physical properties of the obtained hook surface fastener.

[0114] (Comparative Example 4) A loop-shaped engaging element was formed in the same manner as in Example 6, except that the heat treatment in Example 6 was carried out at 100° C. The physical properties of the obtained loop surface fastener are shown in Table 1. In addition, the hook surface fastener obtained in Comparative Example 3 and the loop surface fastener obtained in Comparative Example 4 were combined and various engaging forces were measured.

[0115]

[0116] As shown in Table 1, although Comparative Examples 1 and 2 use PPS thread, a heat-resistant resin, to form the hook-and-loop fasteners, the dimensional change rates after 24 hours of exposure at 200°C were 5.6% and 6.0%, respectively, and as the hook-and-loop fasteners shrunk, distortion and wrinkles occurred in the fabric to which the hook-and-loop fasteners were sewn. Furthermore, after 24 hours of exposure at 200°C, the hook shape of the hook elements in Comparative Example 1 was fully stretched and no longer maintained, making it impossible to maintain the engaging force with the loop-shaped engaging elements. Furthermore, in Comparative Example 2, the penetration rate of the adhesive resin into the engaging elements was high, and the multifilaments constituting the loop-shaped engaging elements were bundled by the adhesive resin, making it difficult for the multifilaments to unravel, resulting in poor initial shear and peel.

[0117] In addition, although Comparative Examples 3 and 4 underwent heat treatment in step A, the temperature was 100°C, which is 10°C higher than the glass transition temperature of PPS (90°C). Therefore, the dimensional change rate after 24 hours of exposure at 200°C was 5.2% and 5.3%, respectively. As the hook-and-loop fasteners contracted, distortion and wrinkles occurred in the fabric to which the hook-and-loop fasteners were sewn. Furthermore, after 24 hours of exposure at 200°C, the hook shape of the hook-shaped engaging elements in Comparative Example 3 was fully stretched and no longer maintained, making it impossible to maintain the engaging force with the loop-shaped engaging elements. In addition, in Comparative Example 4, the penetration rate of the adhesive resin into the engaging elements was high, and the multifilaments constituting the loop elements were bundled by the adhesive resin, making them less likely to unravel, resulting in poor initial shear and peel strength.

[0118] In Examples 5 and 6, heat treatment was performed in step A at 140°C, which is above the glass transition temperature of PPS, and therefore the dimensional change rate when exposed to 200°C for 24 hours was reduced, but some distortion occurred in the fabric to which the hook fastener was sewn. Furthermore, after 24 hours of exposure at 200°C, the hook shape of the hook element was slightly stretched and some separation between the engaging elements was observed, but the overall engagement of the hook fastener was maintained.

[0119] Furthermore, in Examples 1 to 4, since heat treatment was performed at 200°C or 250°C in step A, there was almost no distortion or wrinkles in the fabric to which the hook fastener was sewn, and even after 24 hours of exposure at 200°C, the hook shape of the hook elements remained almost unchanged, and the overall engagement of the hook fastener was maintained without any disengagement between the engaging elements.

[0120] The hook-and-loop fasteners can be used in vehicles such as automobiles, airplanes, and trains, special clothing such as fire-resistant clothing, firefighting clothing, and high-temperature work clothing, and industrial materials such as heat insulating materials and building materials.

[0121] As described above, the preferred embodiments of the present invention have been described, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention, and such additions, modifications, or deletions are also included within the scope of the present invention.

[0122] REFERENCE SIGNS LIST 1 weft thread 2 warp thread 3 hook-shaped engaging element 4 loop-shaped engaging element 5 base fabric 6a outer ear region 6b middle ear region 7 adhesive resin 10 hook-and-loop fastener We weft direction Wa warp direction

Claims

1. A hook-and-loop fastener having a base fabric formed of thermoplastic resin fibers, a first surface being the front side and a second surface being the back side, a plurality of hook-shaped and / or loop-shaped engaging elements formed from engaging element threads rising from the first surface of the base fabric and constituting part of the base fabric, and a continuous surface portion, the hook-and-loop fastener comprising an adhesive resin that fixes the engaging element threads within the base fabric, wherein the dimensional change rate of the hook-and-loop fastener in at least one of the length and width directions is 5.0% or less when exposed to 200°C for 24 hours.

2. A hook-and-loop fastener according to claim 1, having a width of 20 mm or more.

3. The hook-and-loop fastener according to claim 1, wherein the base fabric is formed of polyphenylene sulfide fibers.

4. A hook-and-loop fastener according to claim 1, wherein an adhesive resin permeates at least a portion of said base fabric.

5. A hook-and-loop fastener as described in claim 4, in which, in the protruding direction of the engaging elements, the adhesive resin penetrates into the engaging elements from the first surface of the base fabric at a rate of 50% or less, with the height from the first surface of the base fabric to the top of the engaging elements being taken as the reference (100%).

6. A hook-and-loop fastener as claimed in claim 1, in which ears having no engaging elements are present in the length direction and / or width direction of the base fabric.

7. A method for manufacturing a hook-and-loop fastener comprising a base fabric formed of thermoplastic resin fibers, a first surface being the front side and a second surface being the back side, a plurality of hook-shaped and / or loop-shaped engaging elements formed from engaging element threads rising from the first surface of the base fabric and constituting part of the base fabric, and an adhesive resin having a continuous surface portion and fixing the engaging element threads within the base fabric, wherein the dimensional change rate of the hook-and-loop fastener in at least one of the length and width directions when exposed to 200°C for 24 hours is 5.0% or less, the method comprising carrying out the following steps A and B, and, if necessary, step C, in the order listed. [Step A] A step of heat treating a loop base fabric in which an engaging element thread rises in a loop shape from a first surface of the base fabric under tension at a temperature equal to or higher than the glass transition temperature Tg+15°C of the thermoplastic resin fiber having the highest glass transition temperature among the thermoplastic resin fibers constituting the loop base fabric; [Step B] A step of applying an adhesive resin to a second surface of the loop base fabric to fix the engaging element thread within the base fabric; and [Step C] A step of cutting one leg of the loop to form the loop into a hook-shaped engaging element, when a hook-shaped engaging element is to be formed.

8. A method for producing a hook-and-loop fastener according to claim 7, wherein the tension in step A is 50 to 600 g / cm.

9. A method for producing a hook-and-loop fastener according to claim 7 or 8, wherein the heat treatment in step A is carried out for 30 to 120 seconds.

10. An insulation fastener for fixing an insulation material, the insulation fastener comprising a hook-and-loop fastener according to any one of claims 1 to 6.

11. An insulation material comprising the insulation material fastener according to claim 10.

12. A method for fastening insulation using the insulation fastener according to claim 10.

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