JP2022129751A - fiber structure - Google Patents

Abstract

To provide a fiber structure made up of cotton yarn including synthetic fiber and natural fiber, which causes only a small amount of fiber waste during washing, and has only small environmental load.SOLUTION: The present invention discloses a fiber structure made up of cotton yarn including natural fiber and synthetic fiber. The synthetic fiber includes recycled polyester, the natural fiber and the synthetic fiber are partially bonded by using a resin, the resin is deposited on the fiber structure at a rate of 0.1-2.1 mass%, and the air permeability is 0.1 cc/cm2/s or more.SELECTED DRAWING: None

Description

The present invention relates to fibrous structures.

In recent years, there has been concern about the adverse effects on ecosystems caused by the uptake of plastic waste in oceans and rivers by organisms. Of particular concern are plastic containers that have been miniaturized by ultraviolet rays and become micro-sized pieces of plastic. Gender is debated.

Synthetic fibers are often used in the textile products currently on the market, and synthetic fibers may fall off as washing waste from the surface of the fabric during washing. .

On the other hand, efforts are being made to recycle synthetic fibers (for example, Patent Document 1).

Further, a treatment method has been proposed in which short fibers are fused together with heat-fusible fibers to prevent fraying of the yarn (for example, Patent Document 2). Furthermore, a method of using a hard finishing agent to improve fastness and durability has also been proposed (eg, Patent Document 3).

JP 2007-138309 A JP-A-5-321035 JP-A-2001-262472

However, the fact is that recycled synthetic fibers contain impurities, are of lower quality than virgin ones, and tend to generate fluff and the like. In addition, spun yarn made by combining multiple fiber types such as synthetic fibers and natural staple fibers can incorporate the advantages of various fiber types, so it is used for a wide range of applications such as business shirts and uniforms. Compared with the long-fiber single-fiber structure, there is a tendency that the amount of fiber waste is large due to short fibers coming off due to physical impact such as washing.

Even with the methods disclosed in Patent Documents 2 and 3, it was not possible to sufficiently suppress the amount of fiber waste generated during washing of fiber structures containing recycled synthetic fibers.

Therefore, the present invention relates to a fiber structure containing synthetic fibers and natural fibers, which maintains an appropriate texture and suppresses the generation of fiber waste that falls off from the cut portion and surface portion of the fabric during washing. An object of the present invention is to provide a fiber structure.

The present invention has the following configuration to solve the above problems.

(1) A fiber structure made of spun yarn containing natural fibers and synthetic fibers, wherein the synthetic fibers contain recycled polyester, and a part of the natural fibers and a part of the synthetic fibers are bonded with a resin. , A fiber structure in which 0.1 to 2.1% by mass of the resin adheres to the fiber structure and air permeability is 0.1 cc/cm ² /s or more.

(2) The fiber structure of (1), wherein the resin contains one or more selected from the group consisting of acrylic resins, urethane resins, silicone resins and polyester resins.

(3) The fibrous structure of (1) or (2), wherein the synthetic fibers contain 0.1 to 2% by mass of heat-fusible fibers relative to the fibrous structure.

According to the present invention, it is possible to provide a fiber structure that maintains an appropriate texture, contains recycled synthetic fibers, suppresses the generation of fiber waste that falls off from the cutting portion and the surface portion of the fabric, and has a low environmental load.

The present invention will be described in detail below. The fiber structure according to the present invention is characterized by being made of spun yarn containing natural fibers and synthetic fibers.

Examples of the natural fibers include cellulose fibers, protein fibers such as wool and silk, and the like. Examples of the cellulose fibers include natural cellulose fibers such as cotton, hemp and pulp, viscose rayon, cupra, and the like. regenerated cellulose fibers and the like can be used. Among them, cotton is preferably used from the viewpoint of functional combination with synthetic fibers and economic efficiency.

The synthetic fiber is not particularly limited, and examples thereof include polyalkylene terephthalate fibers such as polyethylene terephthalate, polytrimethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, and dicarboxylic acid component of polyalkylene terephthalate or diol component such as isophthalate. Copolymerization of acid, isophthalic acid sulfonate, adipic acid, etc., fibers made of copolymers using diol components such as diethylene glycol, aromatic polyester fibers such as modified polyalkylene terephthalate fibers blended with polyethylene glycol, etc., L-lactic acid Polyester fibers such as aliphatic polyester fibers represented by those mainly composed of, polyamide fibers such as nylon 6 fibers and nylon 66 fibers, acrylic fibers mainly composed of polyacrylonitrile, polyethylene and polypropylene, etc. and synthetic fibers such as polyolefin fibers and polyvinyl chloride fibers. Among them, aromatic polyester fibers are preferably used.

The spun yarn used in the present invention is obtained by blending natural fibers and synthetic fibers. As a result, the unique texture of natural fibers and the toughness of synthetic fibers can be achieved at the same time, and the fiber structure made of this spun yarn has excellent texture. Also, three or more kinds of fibers may be mixed. The process of mixing them may be any process as long as it is mixed by batting, drawing, or a gill machine, but it is preferable to mix them evenly and unevenly.

Spun yarn can be produced using a ring spinning machine or a compact spinning machine, which is a normal spinning method. The count of the spun yarn is preferably 10 to 120, which is often used for thin fabrics such as shirts, underwear, and sportswear, as well as denim and uniforms, but can be appropriately selected depending on the application.

The twist coefficient of the spun yarn is preferably in the range of 3.7 to 5.0. A twist coefficient of 3.7 or more eliminates gaps between other short fibers mixed with the heat-bonded fibers, and provides excellent adhesiveness. Further, the higher the twist coefficient, the higher the adhesion rate of the short fibers. It is preferably 3.7 to 4.5.

The spun yarn can be produced by uniformly blending each fiber to form a roving, and spinning this. In the spinning process, it is possible to spin a single roving, It is also possible to combine two or more rovings into one spun yarn. Two or more of the obtained spun yarns may be twisted into a two-ply yarn, a triple yarn, or the like.

The fiber structure of the present invention may be woven or knitted. When the fiber structure is a woven fabric, the weave structure is not particularly limited. Examples include double weave, multiple weave, warp pile weave, weft pile weave, and leno weave. In addition, when the fiber structure is a knitted fabric, the knitting structure is not particularly limited. Examples include knitting, smooth knitting (double-sided knitting), rubber knitting, pearl knitting, Denby weaving, cord weaving, atlas weaving, chain weaving, and insert weaving. A woven fabric is more preferably used because the load on the fiber due to expansion and contraction is small.

Synthetic fibers used in the present invention include recycled polyester. Recycled polyester in the present specification is a polyester obtained by depolymerizing and repolymerizing polyester recovered after use, so-called chemically recycled polyester and polyester recovered after use is sorted and pulverized, washed, melted, and recycled. Pelletized polyester, so-called material recycled polyester.

Polyester species used as this recycled polyester include polyalkylene terephthalates such as polyethylene terephthalate, polytrimethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, dicarboxylic acid components of polyalkylene terephthalates, and diol components such as isophthalic acid and isophthalic acid. Copolymerization of sulfonate, adipic acid, etc., copolymers using diol components such as diethylene glycol, aromatic polyester resins such as modified polyalkylene terephthalate blended with polyethylene glycol, etc., and those mainly composed of L-lactic acid. polyester-based resins such as aliphatic polyester-based resins that are used in the present invention can be exemplified, but are not limited thereto. However, from the viewpoint of versatility as a fiber, physical properties, and economic efficiency of recovered polyester, it is preferable that substantially 90 mol % or more is an aromatic polyester resin such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate. .

The content of recycled polyester is preferably 50% by mass or more with respect to synthetic fibers. More preferably, it is 70% by mass or more.

Synthetic fibers containing recycled polyester can be produced by producing raw cotton using only recycled polyester and blending it with virgin polyester. When it is difficult to obtain the whiteness due to the inclusion of recycled polyester, the whiteness can be adjusted by appropriately blending with virgin polyester.

The fiber structure of the present invention is formed by bonding a portion of natural fibers and a portion of synthetic fibers with a resin. Natural fibers and synthetic fibers behave differently when they come into contact with water during washing, in other words, the degree of swelling and shrinkage. It is necessary to be joined to prevent fiber waste from falling off during washing. By partially bonding with resin, it is possible to suppress the generation of fiber waste from the surface of the fabric during washing while maintaining an appropriate texture. Furthermore, while recycled polyester has the effect of reducing the environmental load compared to virgin polyester, the quality is not stable due to impurities contained in the recycling process, and fiber waste is likely to occur during washing. By bonding some of the natural fibers and some of the synthetic fibers with a resin, it is possible to suppress the generation of fiber waste during washing.

The fiber structure of the present invention has an air permeability of 0.1 cc/cm ² /s or more. If the air permeability is less than 0.1 cc/cm ² /s, it is not preferable because it lacks comfort. In order to obtain higher comfort, it is preferably 9.0 cc/cm ² /s or more. The upper limit is preferably 20.0 cc/cm ² /s or less from the viewpoint of transparency.

Resins containing one or more selected from the group consisting of acrylic resins, urethane resins, silicone resins and polyester resins can be used as the resin for bonding the fiber structure of the present invention. Although it is not particularly limited as long as it does not impair water absorption and texture, acrylic resins and silicone resins are preferably used from the viewpoint of washing durability. The amount of resin to be adhered must be 0.1 to 2.1% by mass with respect to the fiber structure. When the adhesion amount is 0.1% by mass or more, a sufficient bonding effect can be obtained, and when the adhesion amount is 2.1% by mass or less, the texture does not become too hard, which is preferable. More preferably, it is 0.5 to 1.5%. Also, depending on the type of resin, it is preferable to use a cross-linking agent in combination.

There are no particular limitations on the method for joining a portion of the natural fiber and a portion of the synthetic fiber, but examples include impregnation, spraying, and printing with a gravure roll. There is a method of dry heat treatment after applying to the fiber structure by the method of.

The synthetic fiber used in the present invention preferably contains 0.1 to 2.0% by mass of heat-fusible fiber relative to the fiber structure. By using the heat-fusible fibers, the fibers can be joined not only by points but also by lines, and the generation of fiber waste during washing can be suppressed. When the content of the heat-fusible fibers is 0.1% by mass or more, a sufficient bonding effect can be obtained, and when the content is 2.0% by mass or less, the texture does not become too hard, which is preferable. More preferably, it is 0.5 to 1.5% by mass. In addition, when heat-fusible fibers are used, it is preferably 0.2 to 2.1% by mass based on the fiber structure together with the adhesion amount of the resin that bonds the fiber structure.

Examples of thermally bonded short fibers include short fibers in which at least a part of the fiber surface is composed of a polymer having a lower melting point than that of the material constituting the other fibers. Specifically, a low melting point polymer having a melting point of 200° C. or less and a polymer having a higher melting point than the low melting point polymer are conjugated and spun such that the low melting point polymer is arranged on at least a part of the fiber surface. Composite fibers obtained by Among them, a core obtained by composite spinning a low-melting polyester (A) having a melting point of 200° C. or less as a sheath component and a polyester (B) having a melting point higher than that of the low-melting polyester (A) as a core component. Sheath conjugate fibers are preferable because spun yarn having excellent strength can be obtained. The low melting point polyester (A) is not particularly limited as long as it has a melting point lower than that of other fibers. , and polyalkylene glycols and/or their monoethers. Among them, it is more preferable to use a copolymer polyester obtained by copolymerizing 60 mol % of terephthalic acid or its derivative and isophthalic acid or its derivative as the acid component and ethylene glycol and diethylene glycol as the glycol component.

As the polyester (B), a polyester having a melting point higher than that of the low melting point polyester (B) and having a melting point of 200° C. or higher or higher is usually used. Specifically, polyethylene terephthalate and polybutylene terephthalate are preferably used, and polyethylene terephthalate is most preferable from the viewpoint of strength characteristics.

The conjugate ratio in the conjugate fiber is desirably such that the low melting point polyester (A) is 20 to 80% by weight in the conjugate fiber. When the low-melting-point polyester (A) is 20% by weight or more, sufficient adhesiveness with other short fibers to be mixed can be obtained. On the other hand, when the amount is 80% by weight or less, it is preferable because it is generally possible to produce yarn with good spinning properties and the fiber strength is also excellent.

The cross-sectional shape of the heat-bonded short fibers is desirably a round cross-section in order to be heat-bonded with other synthetic fibers and natural fibers.

The fiber structure of the present invention is not particularly limited in dyeing processing methods other than resin bonding, and for example, scouring, relaxing, heat setting, dyeing processing, weight reduction processing, functional processing, etc. can be applied as appropriate. Functional finishing may be used in combination with water repellency, antistatic, hygroscopic, antistatic, antibacterial, deodorizing, form-stabilizing, and other known functional finishing, if necessary.

The thus-obtained fiber structure of the present invention can be used for a wide range of fiber structures, from thin fabrics such as shirts and sportswear to denim, uniforms, and other thick fabrics.

EXAMPLES Next, the fiber structure of the present invention will be described in detail by way of examples. Evaluation was carried out by the following method.

1. Yarn count:
Yarn length L (m) and mass W (g) were measured according to the method of JISL 1095 (2010) 9.4.1, and the cotton count was determined by the following formula.
Cotton count (S) = (453.69 x L x n) / {W x (1 + R/100) x 768.1}

2. Twist factor:
The number of twists was measured according to JIS-L1095 (2010). Specifically, the twist coefficient (K) was obtained using the following formula.
Twist factor (K) = number of twists per inch (T) / √ count ('s)

3. Breathability:
Measured according to JIS L1096-2010 8.26.1 A method "Frazier method".

4. Amount of fiber waste generated during washing:
Cut into a square with a length of 32.0 cm and a width of 32.0 cm, and apply a 2.0 cm wide sealing tape E302 (manufactured by Toray Coatex Co., Ltd.) to a range of 1.0 cm from the edge of the cloth. Temporary adhesion was performed in the protruded state. After temporarily adhering the four sides, a sealing tape was similarly adhered from the opposite side, and the edge of the cloth was sandwiched between the two sealing tapes. The adhesive portion of the sealing tape and the edge of the cloth was sewn to the sewing thread by a lockstitch sewing machine (using polyester filament for the sewing thread, the number of needle movements: 13 stitches/3.0 cm) so as not to come off. Furthermore, using an air-driven fully automatic transfer press HP-4536A-12 (manufactured by Hashima Co., Ltd.), press at 0.6 MPa and 130 ° C. for 5 seconds to perform final adhesion. Test piece (effective evaluation area: 900 cm ² ) was produced.

Subsequently, a C-type reference washing machine described in ISO 6330 (2012) was used. First, for washing the washing machine, 7 kg of AQW-V700E (manufactured by Aqua Co., Ltd.) was used according to the ISO 6330 (2012) C4N method, and rinsing and draining were performed twice without putting the object to be washed. Specifically, the course was carefully set, the amount of water was 40 L, the washing time was 15 minutes, the rinsing was twice, and the dehydration was 7 minutes. In addition, the washing dust collecting filter attached to the washing machine was removed before use. Next, a “nylon screen” NY10-HC (manufactured by Flon Kogyo Co., Ltd.) having an opening of 11.3 μm and a drainability of 82 seconds was attached to the drain hose of the washing machine. After that, the two test pieces treated to prevent falling off of fiber dust were placed in a washing machine and washed under the washing conditions of the ISO 6330 C4N method. However, detergent and load cloth were not used. After washing, the fiber waste adhering to the above "nylon screen" was sucked and filtered using a polycarbonate membrane (K040A047A, manufactured by Advantec Toyo Co., Ltd.) whose mass was measured in advance. After filtration, the polycarbonate membrane and fiber waste were dried at 105° C. for 1 hour, and the weight was measured.

5. Texture:
Evaluation of the texture is performed by sensory evaluation, and 〇 (Good) indicates that it has a moderate hardness for clothing and follows the movement of the body even though it has elasticity, and △ indicates that it is slightly stiff and hinders the movement of the body. (slightly unsatisfactory), and those that were too hard to hinder body movement and gave a strong sense of resistance were judged as x (unsatisfactory).

6. Adhesion amount of resin Assuming that the amount of resin used is A (g/kg), the solid content of resin is B (%), and the reduction rate of mangle is C (%), the amount of resin adhered to the fiber structure is X (mass% ), the value represented by the following formula was used as the adhesion amount.
X (% by mass) = A/1000 x B/100 x C/100 x 100

7. Confirmation that part of the natural fiber and part of the synthetic fiber are joined The surface of the test piece of about 5 cm square is observed with a digital microscope (“VHX-5000” manufactured by KEYENCE Co., Ltd.), natural fiber and synthetic fiber was observed. Magnification was selected from the range of about 100 to 500 so that the resin between the fibers could be clearly observed. In the examples below, the magnification was actually 200 times.

[Test fabric 1]
For both the warp and weft yarns, spun yarn with a twist coefficient of 4.1 is used, with 50% by mass of material recycled polyester staple fiber/15% by mass of virgin polyester staple fiber/35% by mass of cotton. /2.54 cm, weft yarn density: 72 yarns/2.54 cm. The obtained gray fabric (fabric) was singed, desized, scoured, bleached, mercerized, dyed and dried. The resulting fiber structure (116 g/m ² basis weight) was used as test fabric 1 .

[Test fabric 2]
A fabric obtained by processing under the same conditions as the test fabric 1 except that the blend ratio of the spun yarn of the test fabric 1 was set to 45% by mass of material recycled polyester staple fiber // 55% by mass of cotton (basis weight 114 g / m ² ) was used as test fabric 2.

[Test fabric 3]
Except that the blend ratio of the spun yarn of the test fabric 1 was set to 50% by mass of material recycled polyester staple fiber / 14% by mass of virgin polyester staple fiber / 1% by mass of heat-sealed polyester fiber with core-sheath structure / 35% by mass of cotton A fabric (116 g/m ² per unit area) obtained by processing under the same conditions as the fabric 1 for test was used as fabric 3 for test.

[Test fabric 4]
Except that the blend ratio of the spun yarn of the test fabric 1 was set to 50% by mass of material recycled polyester staple fiber / 12% by mass of virgin polyester staple fiber / 3% by mass of heat-sealed polyester fiber with core-sheath structure / 35% by mass of cotton A fabric (116 g/m ² per unit area) obtained by processing under the same conditions as the fabric 1 for test was used as fabric 4 for test.

[Test fabric 5]
The fabric obtained by processing under the same conditions as the test fabric 1 except that the blend ratio of the spun yarn of the test fabric 1 was 65% by mass of virgin polyester (recycled polyester not used) / 35% by mass of cotton (basis weight 116 g / m ² ) was designated as test fabric 5 .

[Example 1]
A treatment liquid containing 38.6 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 1 is immersed in this treatment liquid in an expanded state, and is squeezed using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 1.0% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 2]
A treatment liquid containing 15.4 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 1 is immersed in this treatment liquid in an expanded state, and the squeeze rate is determined using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.4% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 3]
A treatment liquid containing 44.4 g/kg of the compound (B) described later and the remaining amount being deionized water is prepared, and the test fabric 1 is immersed in this treatment liquid in an expanded state and the wringing ratio is determined using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 1.4% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 4]
A treatment liquid containing 19.3 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 3 is immersed in this treatment liquid in an expanded state, and is squeezed using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.5% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 5]
A treatment liquid containing 38.6 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 3 is immersed in this treatment liquid in an expanded state, and the squeeze rate is determined using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 1.0% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was slightly hard but good.

[Example 6]
A treatment liquid containing 19.0 g/kg of the compound (B) described later and the remaining amount being deionized water is prepared, and the test fabric 2 is immersed in this treatment liquid in an expanded state, and the squeeze ratio is obtained using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.6% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 7]
A treatment liquid containing 22.6 g/kg of the compound (C) described later and the remaining amount being deionized water is prepared, and the test fabric 1 is immersed in this treatment liquid in an expanded state, and is squeezed using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.6% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was good.

[Example 8]
A treatment solution containing 91.4 g/kg of the compound (D) described later and the remaining amount being deionized water was prepared, and the test fabric 1 was immersed in this treatment solution in an expanded state, and the squeeze ratio was obtained using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 1.6% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were bonded, and as shown in Table 1, the amount of fiber waste generated during washing was small, and the texture was slightly hard but good.

[Comparative Example 1]
A treatment liquid containing 3.1 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 1 is immersed in this treatment liquid in an expanded state, and is squeezed using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.08% by mass. In the resulting fiber structure, part of the natural fibers and part of the synthetic fibers were bonded together, but to a lesser extent. As shown in Table 2, a large amount of fiber waste was generated during washing.

[Comparative Example 2]
A treatment solution containing 76.2 g/kg of the compound (B) described below and the remaining amount being deionized water was prepared, and the test fabric 1 was immersed in this treatment solution in an expanded state, and the squeeze ratio was obtained using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 2.4% by mass. In the obtained fiber structure, part of the natural fibers and part of the synthetic fibers were joined together, but the extent was large. As shown in Table 2, the texture was hard.

[Comparative Example 3]
The test fabric 4 was subjected to dry heat treatment for 1 minute in a pin tenter set at a temperature of 170° C. to melt and fuse the heat-fusible fibers to obtain a fiber structure. As shown in Table 2, the resulting fiber structure generated a large amount of fiber waste during washing and had a hard texture.

[Comparative Example 4]
A treatment liquid containing 3.1 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 5 is immersed in this treatment liquid in an expanded state, and the squeeze ratio is obtained using a mangle. It was squeezed to 70% and dried in a pin tenter set at a temperature of 130°C. Next, a dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 0.08% by mass. As shown in Table 2, the resulting fiber structure had a good texture and generated a small amount of fiber waste during washing, but it did not contain recycled polyester and was inferior in environmental friendliness. .

[Comparative Example 5]
The test cloth 1 was immersed in deionized water in a spread state, squeezed with a mangle so that the squeeze ratio was 70%, and dried in a pin tenter set at a temperature of 130°C. Next, dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure. As shown in Table 2, the resulting fiber structure had a good feel, but generated a large amount of fiber waste during washing.

[Comparative Example 6]
A treatment liquid containing 386 g/kg of the compound (A) described later and the remaining amount being deionized water is prepared, and the test fabric 5 is immersed in this treatment liquid in an expanded state, and the squeeze ratio is 70% using a mangle. and dried in a pin tenter set at a temperature of 130°C. Next, dry heat treatment was performed for 1 minute in a pin tenter set at a temperature of 170° C. to obtain a fiber structure having a resin adhesion amount of 10% by mass. As shown in Table 2, the obtained fiber structure generated little fiber waste during washing, but had a hard texture and no air permeability, and was not suitable for clothing.

Compound (A): "RIKEN RESIN" SA-625 (manufactured by Miki Riken Kogyo Co., Ltd., silicone resin, solid content 37%)
Compound (B): "Rikenzoru" A-501 (manufactured by Miki Riken Kogyo Co., Ltd., acrylic resin, solid content 45%)
Compound (C): "Superflex (registered trademark)" 460 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., urethane resin, solid content 38%)
Compound (D): "Riken Resin" NPH-76 (manufactured by Miki Riken Kogyo Co., Ltd., polyester resin, solid content 25%)

As is clear from Tables 1 and 2, the fiber structure according to the present invention has an appropriate texture and is suitable for general clothing, etc., which generates little washing dust during washing despite the use of recycled fibers. It is preferably used.

The fiber structure of the present invention is suitable for use in general clothing and the like that have a low environmental impact.

Claims (3)

A fiber structure made of spun yarn containing natural fibers and synthetic fibers,
the synthetic fibers comprise recycled polyester;
A part of the natural fiber and a part of the synthetic fiber are joined with a resin,
0.1 to 2.1% by mass of the resin adheres to the fiber structure,
A fiber structure having an air permeability of 0.1 cc/cm ² /s or more. The fiber structure according to claim 1, wherein said resin is a resin containing one or more selected from the group consisting of acrylic resins, urethane resins, silicone resins and polyester resins. 3. The fiber structure according to claim 1, wherein said synthetic fiber contains 0.1 to 2% by mass of heat-fusible fiber relative to the fiber structure.