JP6137897B2 - Fabric glueing method - Google Patents

Description

  The present invention relates to a method for glueing a fabric produced using a composite fiber composed of an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer.

  The present inventors are a composite fiber composed of an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, and the ethylene-vinyl alcohol copolymer is exposed on at least a part of the surface. First developed technology to produce stretchable fabrics that have spots where there are spots where the fibers are stuck together by partially heat-bonding stretchable fabrics mainly composed of composite fibers and elastic fibers. (Patent Document 1).

In the stretchable fabric developed by the present inventors, the portion where the fiber-glue or pseudo-glue existing in spots in the fabric is generated is the other location where the fiber-glue or pseudo-glue is not generated. In comparison with, the hardness is increased and the elongation recovery stress (elastic modulus) is enhanced.
Therefore, if this technology is applied to a specific part of the underwear, for example, a function for correcting the body shape of the specific part of the body will appear, or peripheral blood flow will be promoted by binding the muscles of the specific part. The function to eliminate blood congestion can be revealed. In addition, if this technology is applied to the upper of the shoe, the entire upper of the shoe is formed from the above-mentioned stretchable fabric, and the fibers of the fabric portion located at the toe portion and the heel portion are glued together, the toe portion and The heel portion can be made harder than other portions of the crust (for example, the side portions of the crust).

The inventors of the present invention have further studied the technique of Patent Document 1. Since the melting point of the ethylene-vinyl alcohol copolymer constituting the composite fiber is generally 155 ° C. or higher, a composite fiber comprising the ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer is used. If the thermocompression treatment is performed at a temperature higher than 155 ° C. in order to partially bond the fabric produced using the thermocompression treatment to cause adhesion between the composite fibers, the fabric may be deteriorated or contracted. found. Moreover, in order to heat-adhere efficiently, the non-general-purpose equipment which can set high temperature is needed.
From this point, while preventing thermal deterioration and shrinkage of the fabric, a fabric produced using a composite fiber composed of an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer is subjected to a thermocompression treatment to form fibers. There is a need for the development of a method for agglutinating or pseudo-glueing.

JP 2008-291397 A

  The object of the present invention is to cause thermal degradation of the fabric when the fabric produced using a composite fiber composed of an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer is heated and pressed to bond the fibers together. It is to provide a processing method capable of performing thermocompression bonding while preventing shrinkage.

  In order to achieve the above object, the inventors have made various studies. Then, in heating and pressurizing a fabric produced using a composite fiber composed of an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, the fibers are glued to each other. It is found that when heated and pressed in a state of containing, the adhesive between the composite fibers is satisfactorily performed even at a low temperature of 160 ° C. or less, and the fabric is heat-finished and shrinkage does not occur, resulting in a good finish. The present invention has been completed based on this finding.

That is, the present invention
(1) A composite fiber comprising an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, wherein the ethylene-vinyl alcohol copolymer is exposed on at least a part of the surface ( A method for agglutination treatment of a fabric produced using a), wherein at least water is applied to a portion of the fabric to which the agglutination treatment is applied, and the fabric is heated and pressurized in a state where water is contained in the fabric to form the fabric. In another aspect, the present invention is a method for glueing a cloth, characterized in that glued composite fibers (a) are glued together.

And this invention,
(2) The ethylene-vinyl alcohol copolymer constituting the composite fiber (a) is an ethylene-vinyl alcohol copolymer in which the content ratio of structural units derived from ethylene is 25 to 60 mol% (1) A method of agglutination treatment of the fabric of
(3) The other fiber-forming thermoplastic polymer constituting the composite fiber (a) is one or more selected from a polyester polymer, a polyamide polymer, and a polyolefin polymer (1) ) Or (2) the method for agglutinating a fabric;
(4) The fabric according to any one of (1) to (3), wherein the fabric is a fabric manufactured using only the composite fiber (a), or a fabric manufactured using the composite fiber (a) and another fiber. A method of agglutination treatment of
(5) The sizing treatment method for a fabric according to any one of (1) to (4), wherein the composite fibers (a) are glued together by heating and pressing under conditions of a temperature of 90 to 160 ° C. and a pressure of 0.1 to 10 MPa; and,
(6) The method for glueing a fabric according to any one of the above (1) to (5), wherein the composite fibers (a) are glued together with a part of the fabric;
It is.

In the case of the agglutination treatment method of the present invention, the composite fibers (a) forming the fabric are agglomerated at a lower temperature (generally a temperature lower by 30 ° C. or more) than in the prior art described in Patent Document 1 and the like. Therefore, the composite fibers (a) forming the fabric can be satisfactorily adhered to each other while preventing deterioration of the fibers constituting the fabric and shrinkage of the fabric.
In the case of the adhesive treatment method of the present invention, the composite fibers (a) that are heated and pressed at a temperature lower than that of the conventional fabric to form the fabric can be adhered to each other.
The composite fiber (a) in which the ethylene-vinyl alcohol copolymer is exposed on at least a part of the fiber surface is excellent in bending resistance even after the fibers are stuck together, and even when an external force such as bending is applied. In the fabric obtained by the agglutination treatment of the present invention, since the cracks and cracks do not occur, the portion subjected to the agglutination treatment maintains a good bending resistance as it is, and even if an external force such as bending is applied, Does not break.

The present invention is described in detail below.
The present invention relates to a composite fiber (a) comprising an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, wherein the ethylene-vinyl alcohol copolymer is exposed on at least a part of the fiber surface. This is a method for agglutinating treatment of a fabric produced using the above [hereinafter, this fabric may be referred to as “fabric (A)”].
Here, the “glue” in the present invention means that the composite fibers (a) constituting the fabric (A) are fused without boundary or there is a boundary between the composite fibers (a). It means a state in which the composite fibers (a) are joined together in a state where the composite fibers (a) are destroyed if they are forcibly separated.

  The ethylene-vinyl alcohol copolymer constituting the composite fiber (a) forming the fabric (A) is a copolymer obtained by saponifying a structural unit derived from vinyl acetate in the ethylene-vinyl acetate copolymer. In the polymer, the composite fiber (a) is preferably formed of an ethylene-vinyl alcohol copolymer having a saponification degree of 95% or more, particularly 99% or more.

In the ethylene-vinyl alcohol copolymer constituting the composite fiber (a), the content ratio of the structural unit derived from ethylene (hereinafter referred to as “ethylene unit”) is 25 to 60 mol in terms of hydrophilicity, melt spinnability and the like. % Of vinyl alcohol-derived structural units (hereinafter referred to as “vinyl alcohol units”) content (including unsaponified vinyl acetate units) is preferably 75 to 40 mol%, and the ethylene unit content is It is more preferable that the content of vinyl alcohol units is 30 to 50 mol% and 70 to 50 mol%.
When the ethylene unit content in the ethylene-vinyl alcohol copolymer is less than 25 mol% (when the vinyl alcohol unit content exceeds 75 mol%), the melt spinnability deteriorates and other fiber formation occurs. When the composite fiber (a) is produced by composite spinning with a heat-sensitive thermoplastic polymer, the spinnability becomes poor, and single yarn breakage or yarn breakage tends to occur during spinning or stretching. On the other hand, when the ethylene unit content in the ethylene-vinyl alcohol copolymer exceeds 60 mol% (when the vinyl alcohol unit content is less than 40 mol%), the composite fiber has a hydrophilic feel and good texture. Is difficult to obtain.

  The melt index of the ethylene-vinyl alcohol copolymer constituting the composite fiber (a) [molecular weight index: JIS K3210-1999 (190 ° C., 2160 g under load) outflow mass (g / 10 min)] is 3. It is preferable that it is -15, and it is more preferable that it is 5-12. When the melt index of the ethylene-vinyl alcohol copolymer is too large, the melt spinnability is lowered, and the spinnability becomes poor when spinning with other fiber-forming thermoplastic polymers. Single yarn breakage and breakage during stretching are likely to occur. On the other hand, if the melt index of the ethylene-vinyl alcohol copolymer is small, the melt spinnability is lowered as described above, and the spinnability becomes poor when composite spinning with other fiber-forming thermoplastic polymers. Single yarn breakage or yarn breakage during spinning or drawing tends to occur.

The melting point of the ethylene-vinyl alcohol copolymer constituting the composite fiber (a) is preferably 155 to 190 ° C, more preferably 160 to 180 ° C.
When the melting point of the ethylene-vinyl alcohol copolymer is lower than 155 ° C., it is difficult to set a stable spinning temperature. On the other hand, when the melting point is higher than 190 ° C., the adhesive treatment is performed in a state where water is included in the fabric. Even when performing, it is necessary to heat and press at a temperature exceeding 160 ° C.
The ethylene-vinyl alcohol-based copolymer constituting the composite fiber (a) is preferably not subjected to a crosslinking treatment, but the object of the present invention is to allow the fabric to be glued at a lower temperature than before. As long as it does not interfere with the above, a crosslinking treatment may be performed using a crosslinking agent such as an aldehyde or nonane dial as necessary. The cross-linking treatment of the ethylene-vinyl alcohol copolymer may be performed at any stage before producing the composite fiber (a) and after producing the composite fiber (a).

The other fiber-forming thermoplastic polymer forming the composite fiber (a) is a fiber-forming thermoplastic polymer other than the ethylene-vinyl alcohol copolymer, and the fabric is glued. A fiber-forming thermoplastic polymer having a melting point higher than the heating temperature at the time and capable of maintaining the fiber form without melting during the agglutination treatment is preferably used. Examples of other fiber-forming thermoplastic polymers include polyester polymers, polyamide polymers, polyolefin polymers, and the like, and one or more of these can be used. Among these, polyester polymers and polyamide polymers are preferably used from the viewpoint of spinnability.
Examples of the polyester polymer include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and a sulfonate group in which a part of the terephthalic acid unit constituting the polyester is represented by the formula “—SO ₃ X” (wherein X is Terephthalic acid unit substituted with terephthalic acid unit or isophthalic acid unit substituted with metal ion, quaternary phosphonium ion, cation forming salt such as quaternary ammonium ion), terephthalic acid unit constituting polyester Examples thereof include copolymer polyesters in which a part of them is replaced with other aromatic dicarboxylic acid units such as isophthalic acid, and other aliphatic dicarboxylic acid units such as cyclohexanedicarboxylic acid and adipic acid.
Examples of the polyamide-based polymer include nylon-6, nylon-6,6, and the like.

  The composite ratio of the ethylene-vinyl alcohol copolymer and the other fiber-forming thermoplastic polymer in the composite fiber (a) is from the viewpoints of spinnability at the time of composite spinning, efficiency at the time of glueing, yarn strength, etc. , Ethylene-vinyl alcohol copolymer: other fiber-forming thermoplastic polymer = 90: 10 to 10:90 is preferable, and the mass ratio is 70:30 to 30:70. More preferred. When the composite ratio of the ethylene-vinyl alcohol copolymer is less than 10% by mass, the stickiness of the fabric produced using the composite fiber (a) is lowered or the hydrophilicity is lowered. On the other hand, when the composite ratio of the ethylene-vinyl alcohol copolymer exceeds 90% by mass, the fiber properties such as the strength of the composite fiber (a) are likely to be deteriorated.

The composite form of the composite fiber (a) may be any composite form in which the ethylene-vinyl alcohol copolymer is exposed on at least a part of the fiber surface. It is preferable that 50% or more is made of an ethylene-vinyl alcohol-based copolymer from the viewpoint of improving the agglutination performance.
Examples of the composite form of the composite fiber (a) include a core-sheath type composite fiber having an ethylene-vinyl alcohol copolymer as a sheath component and another fiber-forming thermoplastic polymer as a core component, and an ethylene-vinyl alcohol type. A sea-island type composite fiber containing ethylene as a sea component and another fiber-forming thermoplastic polymer as an island component, an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer were alternately laminated. A side-by-side type composite fiber can be used.
Among them, the composite fiber (a) is a core-sheath type composite fiber having an ethylene-vinyl alcohol copolymer as a sheath component and another fiber-forming thermoplastic polymer as a core component, and is subjected to an agglutination treatment. This is preferable from the viewpoint of efficiency.

The cross-sectional shape of the composite fiber (a) is not particularly limited. For example, a circular shape, an elliptical shape, a hexagonal shape, a pentagonal shape, a rectangular shape, a triangular shape, a star shape, a flat shape, a dogbone shape, a T shape, a V shape, a Y shape, A flower shape can be mentioned. Among these, the cross-sectional shape of the composite fiber (a) is preferably circular or elliptical from the viewpoint of spinnability.
The composite fiber (a) is melt-spun using an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, using a composite spinning apparatus having a spinneret corresponding to each composite form. Can be manufactured by.

The type of the fabric (A) produced using the composite fiber (a) may be any of knitted fabric, woven fabric and non-woven fabric.
When the fabric (A) is a knitted fabric, for example, a warp knitted fabric such as a tricot knitted fabric, a Russell knitted fabric, a Milanese knitted fabric, a crochet knitted fabric; a flat knitted fabric, a rubber knitted fabric, a pearl knitted fabric (garter knitted fabric) And weft knitted fabrics such as floating knitted fabrics, tack knitted fabrics, double-sided knitted fabrics and circular knitted fabrics.
When the fabric (A) is a woven fabric, examples thereof include a plain woven fabric, a twill woven fabric, a satin woven fabric, and a jacquard woven fabric.
When the fabric (A) is a non-woven fabric, for example, a fiber web is formed by a dry method, a wet method, a spunbond method, a melt blown method, an airlaid method, etc., and a chemical bond method, thermal bond method, needle punch method, hydroentanglement Nonwoven fabrics obtained by joining or entanglement between fibers by a method or the like can be mentioned.

The fabric (A) may be manufactured using only the composite fiber (a), or may be manufactured using the composite fiber (a) and other fibers.
In order to reliably bond the composite fibers (a) forming the fabric (A) by heating and pressing, the composite fibers (a) are based on the total mass of the fibers forming the fabric (A). The ratio is preferably 30% by mass or more, and more preferably 40% by mass or more.

The composite fiber (a) forming the fabric (A) may be a filament (long fiber) or a short fiber depending on the type or use of the fabric.
When the fabric (A) is a knitted fabric or a woven fabric, it may be formed using only the multifilament yarn of the composite fiber (a) alone, or formed using only the monofilament yarn of the composite fiber (a). It may be formed using only the spun yarn formed only from the short fiber of the composite fiber (a). Also, one or more of multifilament yarn, monofilament yarn and spun yarn consisting only of composite fiber (a) and one or two types of multifilament yarn, monofilament yarn and spun yarn consisting of other fibers Using the above, false twisting, crimping, sweet twisting, strong twisting, covering, tangling, and drawing are made into a composite yarn, and fabric (A) is manufactured using the composite yarn. And you may perform the sticking process of this invention using the said fabric (A).

When the fabric (A) is a fabric having a multiple structure (multilayer structure) such as a double raschel knitted fabric or a double jersey knitted fabric, both surface layer portions are formed using the composite fiber (a). Alternatively, only one surface layer portion may be formed using the composite fiber (a), and the other surface layer portion may be formed using a thread made of another fiber.
When the fabric (A) is a woven fabric, both the warp and the weft may be a woven fabric manufactured using a yarn made of the composite fiber (a), or a yarn made of other fibers may be used as the warp. It may be a woven fabric produced by using a yarn composed of the composite fiber (a) as the weft, or vice versa.
Further, as the fabric (A), a fabric in which a predetermined portion of the fabric is formed from a yarn made of a composite fiber (a) and the other portion is formed from a yarn made of a fiber other than the composite fiber (a) is used. In this case, the sticking treatment of the present invention is applied to the portion formed from the yarn made of the composite fiber (a).
When the fabric (A) is a non-woven fabric, it may be a non-woven fabric formed using the composite fiber (a) alone, or a non-woven fabric formed using the composite fiber (a) and other fibers. Good.

  In the above-described fabric (A) formed using other fibers together with the composite fiber (a), the type of other fibers is not particularly limited, and synthetic fibers (polyester fibers, polyamide fibers, polypropylene fibers, polyvinylidene chloride fibers, Elastic fibers such as polyurethane fibers, acrylic fibers, etc.), semi-synthetic fibers (acetates, etc.), recycled fibers (rayon, cupra, polynosic, etc.), natural fibers (cotton, hemp, silk, wool, etc.) Often, one or more of these fibers can be selected depending on the type and use of the fabric. By using elastic fibers such as polyurethane fibers together with the composite fibers (a), the fabric (A) can be stretched.

  The single fiber fineness, total fineness (if filament yarn), yarn count (if spun yarn), etc., of the composite fiber (a) forming the fabric (A) are not particularly limited, depending on the type and use of the fabric. Can be selected. Further, when other fibers are used together with the composite fiber (a), the single fiber fineness, the total fineness (in the case of a filament yarn), the count (in the case of a spun yarn) of the other fibers are not particularly limited, and the fabric It can be selected according to the type and application of the device.

  When the fabric (A) is a knitted fabric or a woven fabric manufactured using a multifilament yarn made of the composite fiber (a), the single fiber fineness of the composite fiber (a) is 0.1 to 10 dtex, particularly 1 to 1. When manufacturing multifilament yarn made of the composite fiber (a) when the number of filaments of the multifilan metto yarn is 6 to 150 filaments, especially 10 to 100 filaments, and the total fineness is 10 to 500 dtex, especially 50 to 350 dtex. The spinnability and strength characteristics of the fabric (A) are improved, and the gloss and texture of the fabric (A) are improved.

In the present invention, the agglutination treatment is performed in a state in which water is applied to the fabric (A) and the fabric contains water.
Water may be applied only to the portion of the fabric (A) where the glue treatment is performed, or may be applied to the entire fabric (A). If water is applied only to the portion of the fabric (A) where the agglutination treatment is performed, drying of the fabric (A) after the agglutination treatment can be omitted or the drying time can be reduced.
Further, in the state where water is applied only to the place where the agglutination treatment is performed in the fabric (A) and water is included only in the part, the composite fibers (a) in the part including the water are adhered to each other. If the agglutination treatment is performed at a predetermined temperature at which the composite fibers (a) are not agglomerated at the part not containing water, only the part containing water can be agglomerated selectively.

Examples of the method for applying water to the fabric (A) include spraying, flowing down, dipping, and dropping.
When only a part of the fabric (A) is glued, or when the size of the fabric (A) to be glued is small, a method of spraying water on the fabric (A), a method of dripping water, Water can be selectively applied only to the place where the sizing process is performed, and the amount of water applied to the fabric (A) is not excessive, and the drying process after the sizing process can be omitted, or the drying process can be performed. It is preferable because the drying time can be shortened when necessary.
Further, when the entire fabric (A) is subjected to an agglutination treatment, a method of spraying water on the fabric (A), a method of spraying water on the fabric (A), a method of immersing the fabric (A) in water, etc. are adopted. can do.

The temperature at which the agglutination treatment can be performed is not significantly affected by the amount of water applied to the fabric (A), but if the amount of water applied is too small, the effect of reducing the heating temperature during the agglutination treatment is difficult to obtain. On the other hand, if the applied amount of water is too large, a large amount of water vapor is generated during the agglutination process, making it difficult to perform the work, or the drying process after the agglutination process takes time.
From this point, the amount of water to be applied to the fabric (A) is 0.1 to ² mL, particularly 0.3 to 1 mL, of water per 1 cm ^{2 of the} place where the fabric (A) is glued. It is preferable.

The heating and pressurizing treatment for causing the composite fibers (a) forming the fabric (A) to adhere to each other is performed by heating the fabric (A) from one or both of the upper part and the lower part while the upper part and the lower part of the fabric (A) are heated. This is performed using a heating and pressing method and apparatus capable of applying pressure from one or both of the above.
The heating and pressing method and the type and structure of the apparatus at that time are not particularly limited, and the composite fibers (a) forming the fabric (A) are glued together in the entire fabric (A) or at a predetermined location. Any method and apparatus may be used as long as the method can be applied.
Although not limited at all, examples of the heating and pressurizing method for performing the agglutination treatment include a pressing method, a calendering method, and an ironing method.
The heating method may be any of electric heating, heating with a heat medium, heating with high frequency, and the like.
The surface in contact with the fabric (A) in the heating and pressurizing device may be a smooth surface, or a pattern or a figure is engraved depending on the content of the agglutination treatment or the use of the fabric subjected to the agglutination treatment. An uneven surface (embossed surface) may be used.

The heating and pressurization of the fabric (A) during the agglutination treatment is a temperature lower by 5 to 70 ° C. than the melting point of the ethylene-vinyl alcohol copolymer constituting the composite fiber (a), particularly 10 to 50 ° C. It is preferable to carry out at a temperature, and in general, it is preferably carried out under conditions of a temperature of 90 to 160 ° C. and a pressure of 0.1 to 10 MPa, and is carried out under a temperature of 110 to 140 ° C. and a pressure of 0.2 to 5 MPa It is more preferable.
In the case of the method of the present invention in which at least water is applied to the fabric (A) where the agglutination occurs and the composite fibers (a) are agglutinated, compared to the conventional method in which the agglutination treatment is performed without imparting water, In general, the agglutination treatment can be performed at a temperature lower by 20 to 80 ° C., but if the heating temperature at the time of the agglutination treatment is too low (usually lower than 90 ° C.), the composite fiber (a) constituting the fabric (A) (a ) The sticking between each other tends to be weak, and on the other hand, if the heating temperature is too high (usually higher than 160 ° C.), the fiber constituting the fabric (A) is likely to deteriorate, the fabric (A) shrinks, etc. It is also uneconomical in terms of thermal efficiency.
Moreover, when the pressure at the time of heating and pressurization is lower than 0.1 MPa, the sticking between the composite fibers (a) constituting the fabric (A) tends to be weak, whereas when the pressure is higher than 10 MPa, the sticking part becomes too hard. Thus, the texture, appearance, strength and the like of the entire fabric are likely to be reduced.

When the fabric (A) has a multilayer structure of two or more layers, both surfaces of the fabric (A) may be subjected to an agglutination treatment, or only one surface may be subjected to an agglutination treatment. .
In particular, the fabric (A) has a multilayer structure of two or more layers, and only one surface layer side is formed using the composite fiber (a), and the other surface layer side is more than the composite fiber (a). When formed using fibers having a high melting point, the fibers are preferably adhered to each other only on the surface layer side formed using the composite fiber (a).
Further, when the fabric (A) has a multilayer structure of two or more layers and both surface layers are formed using the composite fiber (a), the fibers are adhered to each other in both surface layers. Alternatively, the fibers may be glued only on one surface layer side. In the latter case, the fibers can be adhered to each other only on one surface side by changing the heating temperature between one surface side and the other surface side of the fabric (A).

Moreover, before performing the agglutination treatment of the present invention, a heat setting treatment for imparting dimensional stability to the fabric (A), a dyeing treatment, or the like may be performed, if necessary. You may perform both a heat setting process and a dyeing | staining process. Moreover, after performing the glueing process of this invention, you may dye | stain a fabric (A) as needed. In the case where the fabric (A) is preliminarily heat set, a temperature of 110 to 150 ° C, particularly 120 to 140 ° C is preferably employed.
The dyeing process may be performed by selecting an appropriate dye according to the type of other fiber-forming thermoplastic polymer forming the composite fiber (a).

Hereinafter, the present invention will be specifically described with reference to examples and the like, but the present invention is not limited to the following examples.
In the following examples, the presence or absence of adhesion and the presence or absence of shrinkage in the fabric after the adhesion treatment were determined by the following method.

[Judgment of presence or absence of sticking]
The composite fibers (a) forming the fabric (A) are fused together without any boundary, or even if there is a boundary between the composite fibers (a), they will not be separated and will be separated if they are forcibly separated. The case where the fiber (a) breaks is determined to be “sticking”, and when the composite fibers (a) are not stuck to each other or at first glance, the composite fiber (a) is broken. A case where separation was possible without occurrence was judged as “no sticking”.

[Determination of presence or absence of shrinkage wrinkles]
In the fabric (A) after the agglutination treatment, a case where a flat agglutination portion is formed without any wrinkles or distortion due to the agglomeration shrinkage around the location where the agglutination treatment is performed is referred to as “contraction wrinkle”. “No” (○), and if there is a slight wrinkle or distortion due to shrinkage due to the sticking around and / or around the place where the sticking process was performed, it is judged as “Slightly shrinking wrinkle” (△) The case where wrinkles and distortions were strongly generated due to the shrinkage caused by the sticking around the place where the sticking process was performed and / or around the spot was determined as “shrinkage wrinkle” (×).

Example 1
(1) Using a 22-gauge double Russell machine with a distance between the kettles of 5 mm, “Sophistica” manufactured by Kuraray Co., Ltd. as the yarn for the front layer and the back layer [ethylene unit content 44 mol%, saponification degree 99. Core-sheath type composite fiber (sheath component: core component = 55) having 6% ethylene-vinyl alcohol copolymer (melting point 167 ° C. determined from endothermic peak of differential scanning calorimetry) as sheath component and polyethylene terephthalate as core component Multifilament yarn (167 dtex / 48f)] [hereinafter referred to as “composite fiber (a ₁ )”], and “Sophista” manufactured by Kuraray Co., Ltd. [ethylene unit] A core containing an ethylene-vinyl alcohol copolymer having a saponification degree of 99.6% as a sheath component and polyethylene terephthalate as a core component. Type composite fiber multifilament yarn made of (sheath component: the core component = 55 45 weight ratio) (84dtex / 24f)] [hereinafter this using] called "composite fibers (a _2)", double raschel knitted fabric Then, this knitted fabric was finished and set at 140 ° C.
(2) From the double raschel knitted fabric after finishing set obtained in (1) above, a test piece of length × width = 12 cm × 12 cm is cut out, and spray capable of spraying about 5 mL of water once from above the test piece Water was sprayed 5 times to make the whole specimen contain water.
(3) A stainless steel plate of length × width × thickness = 10 cm × 10 cm × 0.5 cm is arranged one by one on the top and bottom of the test piece soaked with water in the above (2), and the test piece is made of two stainless steels. It is sandwiched between plates, placed in a press machine, the temperature of the upper stainless steel plate is set to 130 ° C, the temperature of the lower stainless steel plate is set to 130 ° C, and heated and pressed under a pressure of 0.5 MPa for 20 seconds to perform the agglutination treatment. went.
(4) Regarding the knitted fabric after the agglutination treatment obtained in (3) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₁ ) stuck together to form a flat square glue part, and no wrinkles or distortion occurred around the glue part and the glue part. The results of Example 1 are shown in Table 1 below.

<< Comparative Example 1 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after the finishing set obtained in (1) of Example 1, and the center of the test piece was not provided with water on the test piece. On the top and bottom, vertical × horizontal × thickness = 10 cm × 10 cm × 0.5 cm stainless steel plates are placed one by one and the test piece is sandwiched between two stainless steel plates, which are placed in a press machine and the upper stainless steel plate The temperature was set to 150 ° C., the temperature of the lower stainless plate was set to 150 ° C., and the adhesive treatment was performed by heating and pressing under a pressure of 0.5 MPa for 20 seconds.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. a ₁ ) No agglutination occurred between the two, which was almost the same as before the agglutination process was performed. The results of Comparative Example 1 are shown in Table 1 below.

<< Comparative Example 2 >>
(1) Adhesive treatment was performed in the same manner as in (1) of Comparative Example 1 except that the temperature of the upper and lower stainless steel plates at the time of heating and pressing was changed to 180 ° C. in (1) of Comparative Example 1.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₁ ) were stuck together to form a substantially square glued part, but some wrinkles and distortion occurred around the glued part and the glued part. The results of Comparative Example 2 are shown in Table 1 below.

<< Comparative Example 3 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after finishing set obtained in (1) of Example 1, and the test piece was obtained in the same manner as (2) of Example 1. After spraying water 5 times to make the entire test piece contain water, the test piece is placed on a metal net and glued for 20 seconds in a hot air dryer heated to 130 ° C. without any pressure. Went.
(2) About the knitted fabric after the agglutination treatment obtained in (2) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. As a result, both the front and back layers were agglomerated between the composite fibers (a ₁ ). Nothing happened and it was almost the same as before the agglutination process. The results of Comparative Example 3 are shown in Table 1 below.

Example 2
(1) Using a 22 gauge double Russell machine with a distance between the hooks of 5 mm, using the same “Sophistica” [composite fiber (a ₁ )] manufactured by Kuraray Co., Ltd. as the yarn for the surface layer in Example 1. , Regular polyester monofilament yarn (33 dtex / 1f) [hereinafter referred to as “polyester yarn (b ₁ )”] as the yarn for the intermediate layer, and regular polyester multifilament yarn (167 dtex / 48f) as the yarn for the back layer ( Hereinafter, this was referred to as “polyester yarn (b ₂ )” to produce a double raschel knitted fabric, and this knitted fabric was finish-set at 140 ° C.
(2) From the double raschel knitted fabric after finishing set obtained in (1) above, a test piece of length × width = 12 cm × 12 cm is cut out, and spray capable of spraying about 5 mL of water once from above the test piece Water was sprayed 5 times to make the whole specimen contain water.
(3) A stainless steel plate of length × width × thickness = 10 cm × 10 cm × 0.5 cm is arranged one by one on the top and bottom of the test piece soaked with water in the above (2), and the test piece is made of two stainless steels. It is sandwiched between plates, placed in a press machine, the temperature of the upper stainless steel plate is set to 130 ° C, the temperature of the lower stainless steel plate is set to 130 ° C, and heated and pressed under a pressure of 0.5 MPa for 20 seconds to perform the agglutination treatment. went.
(4) About the knitted fabric after the agglutination treatment obtained in (3) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. As a result, the composite fiber constituting the fabric at the contact point of the upper stainless steel plate (A ₁ ) are bonded together to form a flat square bonded portion, and there is no wrinkle or distortion around the bonded portion and the bonded portion. Adhesion between fibers (polyester filaments) was not performed. The results of Example 2 are shown in Table 1 below.

Example 3
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after finishing set obtained in (1) of Example 2, and the test piece was obtained in the same manner as (2) of Example 1. Water was sprayed 5 times to allow water to be contained in the entire test piece, and a stainless steel plate of length × width × thickness = 10 cm × 10 cm × 0.5 cm was placed one by one above and below the center of the test piece. The test piece is sandwiched between two stainless steel plates, the temperature of the upper stainless steel plate is set to 130 ° C, the temperature of the lower stainless steel plate is set to 25 ° C, and heat-pressed for 20 seconds under a pressure of 0.5 MPa to perform the agglutination treatment. It was.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₁ ) are bonded together to form a flat square bonded portion, and there is no wrinkle or distortion around the bonded portion and the bonded portion. Adhesion between fibers (polyester filaments) was not performed. The results of Example 3 are shown in Table 1 below.

<< Comparative Example 4 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after finishing set obtained in (1) of Example 2, and the center of the test piece was not provided to the test piece without water. On the top and bottom, vertical × horizontal × thickness = 10 cm × 10 cm × 0.5 cm stainless steel plates are placed one by one and the test piece is sandwiched between two stainless steel plates, which are placed in a press machine and the upper stainless steel plate The temperature was set to 150 ° C., the temperature of the lower stainless plate was set to 150 ° C., and the adhesive treatment was performed by heating and pressing under a pressure of 0.5 MPa for 20 seconds.
(2) The knitted fabric after the agglutination treatment obtained in (1) above was evaluated for the presence or absence of agglutination and the presence or absence of shrinkage by the above-described method. ) There was no stalemate between them, and it was almost the same as before the stalemate treatment. The results of Comparative Example 4 are shown in Table 1 below.

<< Comparative Example 5 >>
(1) Adhesive treatment was performed in the same manner as in (1) of Comparative Example 4 except that the temperature of the upper and lower stainless steel plates when heated and pressurized was changed to 180 ° C. in (1) of Comparative Example 4.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₁ ) were stuck together to form a substantially square glued part, but some wrinkles and distortion occurred around the glued part and the glued part. The results of Comparative Example 5 are shown in Table 1 below.

<< Comparative Example 6 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after finishing set obtained in (1) of Example 2, and the test piece was obtained in the same manner as (2) of Example 1. After spraying water 5 times to make the entire test piece contain water, the test piece is placed on a metal net and glued for 20 seconds in a hot air dryer heated to 130 ° C. without any pressure. Went.
(2) About the knitted fabric after the agglutination treatment obtained in (2) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. As a result, both the front and back layers were agglomerated between the composite fibers (a ₁ ). Nothing happened and it was almost the same as before the agglutination process. The results of Comparative Example 6 are shown in Table 1 below.

As seen in the results of Table 1 above, in Examples 1 to 3, the composite fiber (a) (core-sheath type composite fiber having an ethylene-vinyl alcohol copolymer as a sheath component and polyester as a core component) is used. The surface layer and the back surface layer formed from the composite fiber (a) are obtained by applying water to the manufactured fabric (A) (double raschel knitted fabric) and carrying out the agglutination treatment in a state in which water is included. Or although the surface layer was heated and pressed at a temperature as low as 130 ° C., the composite fibers (a) were stuck together in a good state causing wrinkles and distortion of the knitted fabric.
On the other hand, in Comparative Examples 1 and 4, the fabric (A) was heated and pressed at 150 ° C., which was 20 ° C. higher than those in Examples 1 to 3, by performing the agglutination treatment without adding water. However, the composite fibers (a) could not be glued together.
Further, in Comparative Examples 2 and 5, the composite fibers (a) can be adhered to each other by heating and pressing the fabric (A) to which water has not been applied at a high temperature of 180 ° C. However, shrinkage occurred in the fabric due to the glue treatment.
Further, in Comparative Examples 3 and 6, the water was applied to the fabric (A) and then the agglutination treatment was performed. However, the composite fibers (a) could not be agglomerated because they were not pressurized during the agglutination treatment. It was.

Example 4
(1) Using a 22 gauge double raschel machine with a distance between the kettles of 5 mm, as a yarn for the surface layer and the back layer, “cationic dye-dyed sophista” manufactured by Kuraray Co., Ltd. [Content of ethylene unit as sheath component 44 An ethylene-vinyl alcohol copolymer (peak melting point: 167 ° C.) having a mol% and a saponification degree of 99.6% was used, and a copolymerized polyester (terephthalic acid 88.3 mol%, 5-sodium sulfoisophthalic acid 1. Core-sheath type composite fiber (sheath) manufactured using 7 mol%, 1,4-cyclohexanedicarboxylic acid 5.0 mol% and adipine 5.0 mol% dicarboxylic acid unit and copolyester comprising ethylene glycol unit) Multifilament yarn (167 dtex / 48f)] composed of component: core component = 55: 45)) [hereinafter referred to as “composite” Wei (a ₃₎ using the "called, composite fibers mentioned above as yarn for the intermediate layer (a ₃₎ and the total fineness and only the number of filaments is different from Kuraray Ltd." cationic dye-dyeable Sofisuta "(87dtex / 24f) ] [This is hereinafter referred to as “composite fiber (a ₄ )”], a double raschel knitted fabric was prepared, and then the knitted fabric was finished and set at 140 ° C., and then a cationic dye (Japan) It was dyed gray with Kayaku Co., Ltd. “Kayacry”) and further finished at 140 ° C.
(2) A test piece of length × width = 12 cm × 12 cm is cut out from the double raschel knitted fabric after dyeing-finishing set obtained in the above (1), and about 5 mL of water is sprayed once from above the test piece. Water was sprayed 5 times with a spray that was able to contain water throughout the specimen.
(3) A stainless steel plate of length × width × thickness = 10 cm × 10 cm × 0.5 cm is arranged one by one on the top and bottom of the test piece soaked with water in the above (2), and the test piece is made of two stainless steels. It is sandwiched between plates, placed in a press machine, the temperature of the upper stainless steel plate is set to 130 ° C, the temperature of the lower stainless steel plate is set to 130 ° C, and heated and pressed under a pressure of 0.5 MPa for 20 seconds to perform the agglutination treatment. went.
(4) Regarding the knitted fabric after the agglutination treatment obtained in (3) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₃ ) glued together to form a flat square glue part, and no wrinkles or distortion occurred around the glue part and the glue part. The results of Example 4 are shown in Table 2 below.

<< Comparative Example 7 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after dyeing-finishing set obtained in (1) of Example 4, and the test piece was not provided with water. A stainless steel plate of length x width x thickness = 10 cm x 10 cm x 0.5 cm is placed one above the other at the center and the test piece is sandwiched between two stainless steel plates. The temperature of the plate was set to 150 ° C., the temperature of the lower stainless plate was set to 150 ° C., and the paste was heated and pressed under a pressure of 0.5 MPa for 20 seconds.
(2) About the knitted fabric after the agglutination treatment obtained in (2) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. a ₃ ) No agglutination occurred between the two, which was almost the same as before the agglutination process was performed. The results of Comparative Example 7 are shown in Table 2 below.

<< Comparative Example 8 >>
(1) Adhesion treatment was performed in the same manner as in (1) of Comparative Example 9 except that the temperature of the upper and lower stainless steel plates at the time of heating and pressing was changed to 180 ° C. in Comparative Example 7 (1).
(2) About the knitted fabric after the agglutination treatment obtained in (2) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₃ ) were glued together to form a substantially square glued part, but some wrinkles and distortion occurred around the glued part and the glued part. The results of Comparative Example 8 are shown in Table 2 below.

Example 5
(1) Using a 22-gauge double raschel machine with a distance between the hooks of 5 mm, using the same “cationic dye-dyed Sophista” [composite fiber (a ₃ )] used in Example 4 as the yarn for the surface layer Regular polyester monofilament yarn (33 dtex / 1f) [polyester yarn (b ₁ )] as the intermediate layer yarn, and cationic dye-dyed polyester multifilament yarn (167 dtex / 48f) (hereinafter referred to as “polyester yarn (b ₁ )”) as the back layer yarn “Polyester yarn (b ₃ )” was used to produce a double raschel knitted fabric, and the knitted fabric was finished and set at 140 ° C. in the same manner as in Example 4 and dyed with a cationic dye. Further, finish setting was performed at 140 ° C.
(2) A test piece of length × width = 12 cm × 12 cm is cut out from the double raschel knitted fabric after dyeing-finishing set obtained in the above (1), and about 5 mL of water is sprayed once from above the test piece. Water was sprayed 5 times with a spray that was able to contain water throughout the specimen.
(3) A stainless steel plate of length × width × thickness = 10 cm × 10 cm × 0.5 cm is arranged one by one on the top and bottom of the test piece soaked with water in the above (2), and the test piece is made of two stainless steels. It is sandwiched between plates, placed in a press machine, the temperature of the upper stainless steel plate is set to 130 ° C, the temperature of the lower stainless steel plate is set to 130 ° C, and heated and pressed under a pressure of 0.5 MPa for 20 seconds to perform the agglutination treatment. went.
(4) About the knitted fabric after the agglutination treatment obtained in (3) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. As a result, the composite fiber constituting the fabric at the contact point of the upper stainless steel plate (A ₃ ) are bonded together to form a flat square bonded portion, and there is no wrinkle or distortion around the bonded portion and the bonded portion. Adhesion between dye-dyeable polyester fibers (polyester filaments) was not performed. The results of Example 5 are shown in Table 2 below.

Example 6
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after the dyeing-finishing set obtained in (1) of Example 5, and the same as (2) of Example 1 was performed. After spraying the test piece 5 times with water and adding water to the whole test piece, a stainless steel plate of length x width x thickness = 10 cm x 10 cm x 0.5 cm is placed one by one above and below the center of the test piece. Then, the test piece is sandwiched between two stainless steel plates, the upper stainless steel plate temperature is 130 ° C., the lower stainless steel plate temperature is 25 ° C., and heat-pressed for 20 seconds under a pressure of 0.5 MPa for agglutination treatment. Went.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₃ ) are bonded together to form a flat square bonded portion, and there is no wrinkle or distortion around the bonded portion and the bonded portion. Adhesion between dye-dyeable polyester fibers (polyester filaments) did not occur. The results of Example 6 are shown in Table 2 below.

<< Comparative Example 9 >>
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after the dyeing-finishing set obtained in (1) of Example 5, and the test piece was not provided with water. A stainless steel plate of length x width x thickness = 10 cm x 10 cm x 0.5 cm is placed one above the other at the center and the test piece is sandwiched between two stainless steel plates. The temperature of the plate was set to 150 ° C., the temperature of the lower stainless plate was set to 150 ° C., and the paste was heated and pressed under a pressure of 0.5 MPa for 20 seconds.
(2) The knitted fabric after the agglutination treatment obtained in (1) above was evaluated for the presence or absence of agglutination and the presence or absence of shrinkage by the above-described method. ) There was no stalemate between them, and it was almost the same as before the stalemate treatment. The results of Comparative Example 9 are shown in Table 2 below.

<< Comparative Example 10 >>
(1) Adhesive treatment was performed in the same manner as (1) of Comparative Example 9 except that the temperature of the upper and lower stainless steel plates at the time of heating and pressing was changed to 180 ° C. in Comparative Example 9 (1).
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₃ ) were glued together to form a substantially square glued part, but some wrinkles and distortion occurred around the glued part and the glued part. The results of Comparative Example 10 are shown in Table 2 below.

Example 7
(1) In Example 5 (1), instead of the cationic dye-dyed polyester multifilament yarn [polyester yarn (b ₄ )], the black original polyester multifilament yarn (167 dtex / 49f) was used as the back layer yarn. A double raschel knitted fabric having a finishing set-dyeing-finishing set was produced in the same manner as (1) of Example 5 except that (hereinafter referred to as “polyester yarn (b ₄ )”) was used.
(2) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after dyeing-finishing set obtained in (1) above, and the test piece was made in the same manner as in (2) of Example 1. After water was sprayed 5 times and water was included in the entire test piece, a test was conducted by placing stainless steel plates of length x width x thickness = 10 cm x 10 cm x 0.5 cm one by one above and below the center of the test piece. The piece was sandwiched between two stainless steel plates, the temperature of the upper stainless steel plate was 130 ° C., the temperature of the lower stainless steel plate was 130 ° C., and heated and pressurized for 20 seconds under a pressure of 0.5 MPa to perform the agglutination treatment. .
(3) About the knitted fabric after the agglutination treatment obtained in (2) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. As a result, the composite fiber constituting the fabric at the contact point of the upper stainless steel plate (A ₃ ) are stuck together to form a flat square glue part, and there are no wrinkles or distortions around the glue part and the glue part. There was no sticking between the polyester fibers (polyester filaments). The results of Example 7 are shown in Table 2 below.

Example 8
(1) A test piece of length × width = 12 cm × 12 cm was cut out from the double raschel knitted fabric after the dyeing-finishing set obtained in (1) of Example 7, and the same as in (2) of Example 1 After spraying the test piece 5 times with water and adding water to the whole test piece, a stainless steel plate of length x width x thickness = 10 cm x 10 cm x 0.5 cm is placed one by one above and below the center of the test piece. Then, the test piece is sandwiched between two stainless steel plates, the upper stainless steel plate temperature is 130 ° C., the lower stainless steel plate temperature is 25 ° C., and heat-pressed for 20 seconds under a pressure of 0.5 MPa for agglutination treatment. Went.
(2) About the knitted fabric after the agglutination treatment obtained in (1) above, the presence or absence of agglutination and the presence or absence of shrinkage were evaluated by the above-described method. (A ₃ ) are stuck together to form a flat square glue part, and there are no wrinkles or distortions around the glue part and the glue part. There was no sticking between the polyester fibers (polyester filaments). The results of Example 8 are shown in Table 2 below.

As seen in the results of Table 2 above, in Examples 4 to 8, composite fibers (a) (core-sheath type composite fibers having an ethylene-vinyl alcohol copolymer as a sheath component and polyester as a core component) were used. The surface layer and the back surface layer formed from the composite fiber (a) are obtained by applying water to the manufactured fabric (A) (double raschel knitted fabric) and carrying out the agglutination treatment in a state in which water is included. Or although the surface layer was heated and pressed at a temperature as low as 130 ° C., the composite fibers (a) were stuck together in good condition without causing wrinkles or distortion of the knitted fabric.
On the other hand, in Comparative Examples 7 and 9, the fabric (A) was heated and pressed at 150 ° C., which was 20 ° C. higher than those in Examples 4 to 8 by performing the agglutination treatment without adding water. However, the composite fibers (a) could not be glued together.
Moreover, in Comparative Examples 8 and 10, the composite fibers (a) can be glued together by subjecting the fabric (A) to which water has not been applied to heat and pressurization at a high temperature of 180 ° C. to perform the glue treatment. However, the fabric was wrinkled and distorted due to the glue treatment.

  In the case of the present invention, the fabric (A) is produced by applying water to the fabric (A) produced using the composite fiber (a) comprising the ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer. By heating and pressurizing the fabric (A) in a state in which water is contained, the composite fibers (a) forming the fabric (A) are glued together at a lower temperature than before, and the fabric (A) is bonded. Since an adhesive part can be formed smoothly, it is industrially useful.

Claims (5)

A composite fiber (a) comprising an ethylene-vinyl alcohol copolymer and another fiber-forming thermoplastic polymer, wherein the ethylene-vinyl alcohol copolymer is exposed on at least a part of the surface. A method of glueing a part of a fabric selected from a knitted fabric and a woven fabric produced using the fabric, wherein at least water is applied to a location to be glued in the fabric and water is contained in the fabric . A knitted fabric and a woven fabric characterized in that a part of the fabric is heated and pressed from one or both of the upper part and the lower part of the fabric, and the composite fibers (a) are glued together in the heated and pressurized part of the fabric A method in which a part of a fabric selected from fabrics is glued. The method according to claim 1, wherein the ethylene-vinyl alcohol copolymer constituting the composite fiber (a) is an ethylene-vinyl alcohol copolymer having a content ratio of structural units derived from ethylene of 25 to 60 mol%. . The other fiber-forming thermoplastic polymer constituting the composite fiber (a) is one or more selected from polyester-based polymers, polyamide-based polymers, and polyolefin-based polymers. The method described. The fabric is a fabric selected from a knitted fabric and a woven fabric manufactured using only the composite fiber (a), or a fabric selected from a knitted fabric and a woven fabric manufactured using the composite fiber (a) and another fiber . the method according to any one of claims 1 to 3. The method according to any one of claims 1 to 4, wherein the composite fibers (a) are glued together by heating and pressing under conditions of a temperature of 90 to 160 ° C and a pressure of 0.1 to 10 MPa.