JP2016056485A - Polyamide fiber woven or knitted fabric and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyamide fiber woven or knitted fabric with practical durability and excellent lightness, in which the woven or knitted fabric is applicable to clothes and material uses, and to provide a method for producing the same.SOLUTION: There is provided a polyamide fiber woven or knitted fabric comprising polyamide fiber spun yarns that satisfy following requirements (1) to (5), in which the woven or knitted fabric has pilling resistance of 3.5 grade or higher and wear reduction rate of less than 25 mass%. (1) a single fiber fineness is 0.8 to 2.5 dtex; (2) a single fiber length is 40 to 60 mm; (3) the polyamide fiber spun yarn has the total fineness of 8 to 60 yarn count in terms of cotton count and a twist coefficient of 4.0 to 4.5; (4) a cross sectional shape of the single fiber constituting the polyamide fiber spun yarn has voids formed inside the single fiber in a state thereof completely covered with itself and has hollow rate of 35 to 50%; and (5) the polyamide fiber spun yarn has a tensile strength at break of 1.20 cN/dtex, and a tensile elongation at break of 50 to 130%. The single fiber constituting the polyamide fiber spun yarn comprises: a sheath component of polyamide; and a core component of polyester. After spinning, the sheath-core yarn is subjected to heat treatment in an acidic liquid of pH 3.5 or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polyamide fiber woven or knitted fabric suitable for apparel use and material use and a method for producing the same. More specifically, the present invention is applicable to sports for clothing, outerwear for outdoor and casual use, pants, inner use, and material use such as garments and shoes, practical durability and high lightness. The present invention relates to a polyamide fiber woven or knitted fabric including a polyamide spun yarn composed of hollow fibers with reduced manufacturing costs, and a method for manufacturing the same.

  Polyamide fibers have high strength, wear resistance, unique soft texture, and excellent properties in color development and dyeing fastness, and are therefore widely used in general clothing and apparel materials. In addition, fibers having various fiber cross-sectional shapes have been proposed by taking advantage of the properties of polyamide fibers having thermoplasticity, and various proposals have been made for hollow cross-section fibers and their manufacturing methods in order to obtain light weight. However, until now, in order to obtain a hollow cross-section fiber, a method for obtaining a hollow cross-section fiber by making the die of melt spinning into a hollow cross-section shape, or a component having higher alkali decomposability and higher solubility than the sheath component has been arranged in the core component There has been proposed a method for obtaining a hollow cross-section fiber by performing an alkali treatment after obtaining a core-sheath type composite fiber.

  However, in the method of obtaining a hollow cross-section fiber with a melt-spun spout die having a hollow cross-sectional shape, the hollow cross-section fiber is likely to be crushed or cracked in the process of producing a woven or knitted fabric. Since problems are likely to occur, the light weight has not yet been fully satisfied. In order to avoid such crushing and cracking of the hollow cross-section fiber, a core-sheath type composite fiber in which a component having higher alkali decomposability and higher solubility than the sheath component is arranged in the core component is used to form the core after forming the woven or knitted fabric. In the method of obtaining the hollow cross-section fiber by decomposing or dissolving the components, the manufacturing cost is increased because it takes time to decompose or dissolve the core component, and the development to general clothing and material use is still insufficient.

  Conventionally, a core-sheath type composite fiber in which the core component is an easily soluble polyester and the sheath component is made of polyamide, and a hollow fiber is obtained by using a caustic alkali and a polyamide swelling agent in combination to elute the core component. (See Patent Document 1). However, in this proposal, there is a problem that the production cost is greatly increased due to the use of the polyamide swelling agent, and the texture tends to become hard and rough due to the use of the polyamide swelling agent, and the texture of the original polyamide fiber is impaired.

  Further, a method of treating with alkaline hot water containing a glycol ether compound having a chemical structure similar to that of Patent Document 1 has been proposed (see Patent Document 2). The use of ether compounds has resulted in high production costs, poor general applicability, and poor versatility.

  In addition, a method has been proposed in which sea-island or multi-layered composite fibers composed of two or more types of polymers having different hydrolyzability are embrittled using acids to increase solubility and are eluted by alkali treatment. However, in this proposal, the purpose is to divide the composite fiber by elution, and no mention is made until a hollow cross-section fiber is obtained from a complete core-sheath type composite fiber.

  As a polyamide fiber woven or knitted fabric including a polyamide fiber spun yarn composed of hollow cross-section fibers, a woven fabric including a spun yarn manufactured by an air spinning machine using a core-sheath composite fiber whose sheath component is polyamide and whose core component is polyester. A method has been proposed in which a core component is eluted from a knitted fabric by alkali treatment to obtain a hollow polyamide fiber woven knitted fabric having a high anti-pill property (see Patent Document 4). However, in the case of this proposal, the problem that the texture is hard and rough and the characteristics of the polyamide fiber are not sufficiently utilized, and the problem that the anti-pill is poor when a normal ring spinning machine is used remain. .

  Separately, a hollow nylon short fiber structure having excellent anti-pill properties can be obtained by attaching ceramics as an anti-pill agent to the structure of a hollow nylon short fiber manufactured using a normal ring spinning machine. An obtaining method has been proposed (see Patent Document 5). However, in this proposal, by adding an anti-pill agent containing ceramic particles, the texture characteristics of the polyamide fiber are impaired, and it has not yet been achieved to satisfy the market demand for softening the texture in recent years. .

Japanese Patent No. 4254393 Japanese Patent No. 4357282 JP-A-60-224862 JP 2004-250856 A Japanese Patent No. 3985613

  As mentioned above, the conventional technology has practical durability and high light weight that can be developed for sports for clothing, outerwear for outdoor and casual use, pants, innerwear, and clothing materials such as garments and shoes. However, it has not yet been achieved to obtain a polyamide fiber woven or knitted fabric including a polyamide spun yarn composed of hollow fibers with reduced manufacturing costs.

  Therefore, in view of the background of the above-mentioned prior art, an object of the present invention is a polyamide fiber including a polyamide fiber spun yarn composed of hollow fibers having excellent durability and high lightness in terms of anti-pill resistance, wear resistance and strength. An object of the present invention is to provide a woven or knitted fabric and a method for manufacturing a polyamide fiber woven or knitted fabric that can improve the versatility while suppressing the manufacturing cost.

The present invention employs the following means in order to solve the above problems. The polyamide fiber woven or knitted fabric of the present invention is a woven or knitted fabric containing a polyamide fiber spun yarn satisfying the following requirements (1) to (5), and the woven fabric has an anti-pilling property of 3.5 or higher and A polyamide fiber woven or knitted fabric characterized in that the wear loss rate is less than 25% by mass.
(1) The single fiber fineness is 0.8 dtex or more and 2.5 dtex or less,
(2) The single fiber length is 40 mm or more and 60 mm or less,
(3) The total fineness of the polyamide fiber spun yarn is a cotton count of 8 to 60 and a twist coefficient K4.0 to 4.5,
(4) The cross-sectional shape of the single fiber constituting the polyamide fiber spun yarn is completely covered with voids inside the fiber, and the hollow ratio of the single fiber is 35% or more and 50% or less ,
(5) The tensile strength at break of the polyamide fiber spun yarn is 1.20 cN / dtex or more, and the tensile elongation at break is 50% or more and 130% or less.

According to a preferred embodiment of the polyamide fiber woven or knitted fabric of the present invention, the single fiber constituting the polyamide fiber spun yarn is a complete fiber comprising a sheath component made of polyamide and a core component made of polyester copolymerized with a third component. It is a single fiber obtained by heat-treating a core-sheath type composite fiber with an acid-containing treatment solution having a pH of 3.5 or less, followed by heat treatment in an aqueous solution containing at least caustic alkali, and eluting the core component. .
The method for producing a polyamide fiber woven or knitted fabric of the present invention includes a woven fabric including a spun yarn in which a sheath component is made of polyamide and a core component is composed of a complete core-sheath type composite fiber made of polyester in which a third component is copolymerized. The knitted fabric is heat-treated with an acid-containing treatment solution having a pH of 3.5 or less, and then heat-treated in an aqueous solution containing at least a caustic alkali to elute the core component to hollow out the complete core-sheath composite fiber. This is a method for producing a polyamide fiber woven or knitted fabric.
According to a preferred embodiment of the method for producing a polyamide fiber woven or knitted fabric of the present invention, the heat treatment temperature of the acid-containing treatment is 100 ° C. or more and 115 ° C. or less, and the treatment time is 15 minutes or more and 60 minutes or less.
According to a preferred aspect of the method for producing a polyamide fiber woven or knitted fabric of the present invention, the heat treatment temperature in the aqueous solution containing at least the caustic is 95 ° C. or more and 115 ° C. or less, and the treatment time is 30 minutes or more and 90 minutes or less. is there.

  According to the present invention, even in a woven or knitted fabric made of spun yarn manufactured by an ordinary link spinning machine, it has practical durability and high lightness excellent in anti-pill property, wear resistance, and strength without impairing the texture. A polyamide fiber woven or knitted fabric including a polyamide fiber spun yarn comprising hollow fibers is obtained. Moreover, according to the polyamide fiber woven or knitted fabric of the present invention, the polyamide fiber woven or knitted fabric can be manufactured while suppressing the manufacturing cost and improving the versatility.

FIG. 1 is a drawing-substituting photograph showing the cross-sectional shape of a polyamide fiber spun yarn comprising hollow cross-section fibers obtained in Example 1 of the present invention. FIG. 2 is a drawing-substituting photograph showing the cross-sectional shape of a polyamide fiber spun yarn comprising hollow cross-section fibers obtained in Comparative Example 1.

Next, the polyamide fiber woven or knitted fabric of the present invention and the production method thereof will be described in more detail.
The polyamide fiber woven or knitted fabric of the present invention is a woven or knitted fabric containing a polyamide fiber spun yarn that satisfies the following requirements (1) to (5), and the woven fabric has a pill resistance of 3.5 or higher, Moreover, it is a polyamide fiber woven or knitted fabric with a wear loss rate of less than 25% by mass.
(1) The single fiber fineness is 0.8 dtex or more and 2.5 dtex or less,
(2) The single fiber length is 40 mm or more and 60 mm or less,
(3) The total fineness of the polyamide fiber spun yarn is a cotton count of 8 to 60 and a twist coefficient K4.0 to 4.5,
(4) The cross-sectional shape of the single fiber constituting the polyamide fiber spun yarn is completely covered with voids inside the fiber, and the hollow ratio of the single fiber is 35% or more and 50% or less ,
(5) The tensile strength at break of the polyamide fiber spun yarn is 1.20 cN / dtex or more, and the tensile elongation at break is 50% or more and 130% or less.

  The single fiber fineness of the single fiber constituting the polyamide fiber spun yarn used in the polyamide fiber woven or knitted fabric of the present invention is 0.8 dtex or more and 2.5 dtex or less, more preferably 1.0 dtex or more and 2.0 dtex. It is as follows. If the single fiber fineness is less than 0.8 decitec, a soft texture can be obtained, but if it is used for materials such as outerwear for sports use, pants and knitted fabrics, and shoes, it is practical for wear resistance etc. It becomes difficult to obtain durability. In addition, when the single fiber fineness exceeds 2.5 dtex, the resulting woven or knitted fabric has excellent practical durability, but the texture is hard and rough and is not suitable for outer, pants and inner use for casual use. .

  The single fiber length of the single fiber constituting the polyamide fiber spun yarn used in the polyamide fiber woven or knitted fabric of the present invention is 40 mm or more and 60 mm or less. The single fiber length is more preferably 40 mm or more and 55 mm. When the single fiber length is less than 40 mm, it becomes easy to fluff when producing a woven or knitted fabric, and it is difficult to obtain good anti-pilling properties. In addition, when the length of the single fiber exceeds 60 mm, the gloss of the woven or knitted fabric becomes strong and the feeling of span touch is weakened. In addition, when producing spun yarn, it may not be possible to produce with a general spun yarn production facility. Sometimes.

The total fineness of the polyamide fiber spun yarn used in the polyamide fiber woven or knitted fabric of the present invention is 8 to 60 in cotton count, and the twist coefficient K is the twist coefficient (K) represented by the following formula (1). It is 4.0 or more and 4.5 or less, More preferably, it is 4.0 or more and 4.4 or less.
・ T = K × D ^1/2 ... (1)
However,
T = Number of twists per inch of spun yarn D = Total fineness (count) of spun yarn.

  The total fineness of the polyamide fiber spun yarn is more preferably 10 to 50 in cotton count. Although the cotton count of polyamide fiber spun yarn can be used even if it is less than 8, it is too thick for general clothing and clothing materials, and lacks versatility. In addition, when the cotton count exceeds 60, it becomes possible to produce a thin ground knitted fabric, but this is not preferable from the viewpoint of reducing the wear resistance and tear strength, and in the current spinning production technology, it is necessary to use a nep or slab. Spinning defects such as these tend to occur, and the quality of the woven or knitted fabric becomes poor, making commercialization difficult.

When the twisting coefficient K is less than 4.0, the spun yarn is likely to fluff in the process of producing the woven or knitted fabric, and it is difficult to obtain good anti-pilling properties. On the other hand, when the twist coefficient K exceeds 4.5, the anti-pill property is improved, but the texture becomes hard and rough, and the production cost is increased in producing spun yarn.
The cross-sectional shape of the single fiber constituting the polyamide fiber spun yarn used in the polyamide fiber woven or knitted fabric of the present invention is completely covered with voids inside the fiber, and the single fiber has a hollow ratio of 35. % Or more and 50% or less, preferably 40% or more and 50% or less. If there are no gaps in the fully covered state, fibrillation due to abrasion or the like occurs when sewing on clothing, etc., and in the process of producing woven or knitted fabrics, the cross-section and cracking of single fibers occur It becomes easy to do. Further, when the hollow ratio of the single fiber is less than 35%, it is difficult to obtain high lightness. On the other hand, when the hollow ratio exceeds 50%, the cross-section and cracking of the single fiber are likely to occur in the process of producing the woven or knitted fabric. Become.

The tensile break strength of the polyamide fiber spun yarn used in the polyamide fiber woven or knitted fabric of the present invention is 1.20 cN / dtex or more, and the tensile break elongation is 50% or more and 130% or less. The tensile elongation at break is preferably 70% or more and 120% or less.
If the tensile strength at break is less than 1.20 cN / dtex, it will be easy to cause problems in the weaving process, and it can be used for materials such as outerwear, pants, garments and shoes for sports applications. It becomes poor in durability. The upper limit of the tensile strength at break is not particularly limited, but since the single fiber constituting the polyamide fiber spun yarn has a hollow structure, it is preferable that the lower limit is substantially less than 2.5 cN / dtex.
Also, if the tensile elongation at break of the polyamide fiber spun yarn is less than 50%, the tear strength of the woven fabric is insufficient in materials such as outerwear, pants, knitted fabric, and shoes for sports applications that require practical durability. In a knitted fabric, the bursting strength is insufficient, and tearing, tearing and the like are likely to occur. In addition, if the tensile elongation at break exceeds 130%, the woven / knitted fabric manufacturing process, particularly the weaving process and the knitting process, are likely to have problems in passing, and the woven / knitted fabric will not be stretched back. It tends to occur.

  The polyamide fiber woven or knitted fabric of the present invention is a woven or knitted fabric containing the above-described polyamide fiber spun yarn, and the polyamide fiber woven or knitted fabric of the present invention preferably has an anti-pill property defined by the JIS L0217 103 method, preferably 3.5 or higher. And a knitted or knitted fabric having a weight loss rate of preferably less than 25% by mass. If the pill resistance is less than 3.5 grade, it is insufficient in terms of practical durability, and if the wear weight loss rate exceeds 25 mass%, the wear resistance is insufficient, and the cloth caused by rubbing or rubbing due to wearing or the like. Cause tears and perforations.

In the polyamide fiber woven or knitted fabric of the present invention, the single fiber constituting the polyamide fiber spun yarn is made of polyamide. That is, the single fiber constituting the polyamide fiber spun yarn used in the present invention is a completely core-sheath type composite fiber in which the sheath component is made of polyamide, the core component is made of polyester copolymerized with the third component, and the pH is It is a single fiber obtained by heat-treating in an aqueous solution containing at least caustic alkali after the heat treatment with an acid-containing treatment solution of 3.5 or less and eluting the core component.
As the polyamide of the single fiber sheath component, nylon 6, nylon 66, nylon 610, nylon 56, or the like can be used as the polymer, and a blend or copolymer of the above polymers can also be used. Among these, nylon 66 is preferably used from the viewpoint of fiber formability and strength. The polyamide fiber may contain additives such as a matting agent, a flame retardant, an antistatic agent, an antioxidant and an ultraviolet absorber depending on the purpose.

  Examples of the polyester copolymerized with the third component of the core component of the single fiber include a sulfonated aromatic dicarboxylic acid-modified polyester, and examples of the compound having a sulfonate group include a part of the polyester chain or terminal. The modified polyester contained in can be used. More specifically, polyethylene terephthalate or polybutylene terephthalate, or a modified polyester obtained by copolymerizing a sulfonated aromatic dicarboxylic acid or a salt thereof with a copolyester having these as a main component may be used. This is a preferred embodiment.

  A typical example of the sulfonated aromatic dicarboxylic acid is dimethyl 5-sodium sulfoisophthalate, which can be used as a preferred aromatic dicarboxylic acid in the present invention. Moreover, it is preferable that the copolymerization amount is the range of 3.0-10 mol% with respect to a terephthalic acid. If the amount of copolymerization is too low, the desired effect may not be sufficiently obtained. Conversely, if the amount is too large, the crystal structure of the modified polyester may be disturbed, resulting in a significant decrease in mechanical properties.

The complete core-sheath type composite fiber used in the present invention is a core-sheath type composite fiber in which the sheath component is made of polyamide and the core component is made of polyester copolymerized with the third component, and the sheath component completely covers the core component. In this case, the fiber cross section of the core-sheath type composite fiber may be round, three-leaf, four-leaf, five-leaf, flat, X-shaped, well-shaped, or any other shape, and should be selected according to the purpose. Can do.
The complete core-sheath type composite fiber used in the present invention is produced by a conventional melt spinning method. For example, it is manufactured using the following method. Using melt-spun, core-sheathed composite spinneret designed to place sulfonated aromatic dicarboxylic acid-modified polyester in the core and nylon 66 in the sheath, oil supply and entanglement treatment Spinning at a take-up speed of 1000 m / min or more, followed by drawing and winding method, after melt spinning, refueling and entanglement treatment and taking-up at a take-up speed of 1000 m / min or more Examples of the method include a method of winding without stretching, and a method of melt-spinning, refueling and winding once, and then stretching and winding. After that, crimping necessary for spinning of short fibers and application and cutting of raw cotton oil agent were performed to obtain core-sheath type composite fiber raw cotton (short fibers), then through the card process and ring spinning process, the core-sheath type composite A fiber spun yarn is obtained.

  The polyamide fiber woven or knitted fabric of the present invention is obtained by heating the woven or knitted fabric containing the core-sheath composite fiber spun yarn obtained above in an aqueous solution containing at least a caustic alkali after heat treatment in an acid-containing treatment solution having a pH of 3.5 or less. And the core component is eluted from the complete core-sheath composite fiber constituting the core-sheath composite fiber spun yarn.

  Next, the manufacturing method of the polyamide fiber woven or knitted fabric of the present invention will be described in more detail.

The method for producing a polyamide fiber woven or knitted fabric of the present invention comprises a polyamide fiber spun yarn comprising a fully-core-sheath composite fiber in which the sheath component is made of polyamide and the core component is made of polyester copolymerized with the third component. The woven or knitted fabric is heat-treated with an acid-containing treatment liquid having a pH of 3.5 or less, and then heat-treated in an aqueous solution containing at least a caustic alkali to elute the core component. This is a method for producing a hollow hollow polyamide fiber knitted fabric.
According to the method for producing a polyamide fiber woven or knitted fabric of the present invention, the acid-containing treatment liquid has a pH of 3.5 or less, preferably a pH of 2.0 or more and 2.6 or less. If the pH of the acid-containing treatment liquid is less than 2.0, the polyester in which the third component of the core component is copolymerized can be made more brittle and the solubility can be increased, but the strength of the polyamide of the sheath component is reduced, In addition to being liable to cause crushing and cracking of the hollow cross-section fibers, the woven and knitted fabric tends to have anti-pilling properties and wear resistance.

  On the other hand, when the pH exceeds 3.5, the embrittlement effect of the polyester obtained by copolymerizing the third component of the core component is insufficient, and the solubility tends to be unable to be increased. In the method for producing a polyamide fiber woven or knitted fabric of the present invention, the pH of the acid-containing treatment solution is important in a range that does not impair the strength of the polyamide fiber used.

  According to a preferred embodiment of the method for producing a polyamide fiber woven or knitted fabric of the present invention, the heat treatment temperature of the acid-containing treatment liquid is preferably 100 ° C. or more and 115 ° C. or less, and the treatment time is preferably 15 minutes or more and 60 minutes or less. . The heat treatment temperature is more preferably 105 ° C. or more and 110 ° C. or less, and the treatment time is more preferably 20 minutes or more and 45 minutes or less.

  When the heat treatment temperature is less than 100 ° C., the embrittlement effect of the polyester in which the third component of the core component is copolymerized is insufficient, and when the heat treatment temperature exceeds 115 ° C., the strength and texture of the polyamide fiber are impaired. Sometimes. The processing time is preferably 60 minutes or less from the viewpoint of manufacturing cost.

  According to a preferred embodiment of the method for producing a polyamide fiber woven or knitted fabric of the present invention, after the heat treatment with the acid-containing treatment liquid, the heat treatment temperature is 95 ° C. or more and 115 ° C. or less in an aqueous solution containing at least a caustic alkali, and the treatment time. Is performed for 30 minutes to 90 minutes. The heat treatment temperature is more preferably 100 ° C. or more and 110 ° C. or less, and the treatment time is more preferably 45 minutes or more and 90 minutes or less.

  The caustic concentration is 30 g / L or more and 60 g / L or less. When the caustic concentration exceeds 60 g / L, the elution time can be shortened, but the discoloration of the polyamide fiber becomes remarkable. In addition, when the caustic concentration is less than 30 g / L, productivity is reduced because it takes time to elute the core component.

  As a form of the polyamide fiber woven or knitted fabric of the present invention, the above-described production method is used to obtain a woven or knitted fabric after spinning a spun yarn made of a complete core-sheath composite fiber with a cheese dyeing machine or the like. After forming, in the fabric dyeing process, it can be hollowed out by the above production method.

  The polyamide fiber woven or knitted fabric of the present invention can contain other fibers as long as the effects of the present invention are not impaired. Examples of other fibers include polyurethane elastic fibers, long fibers of polyamide fibers, processed yarns, and the like. Examples of the form of other fibers include other fiber yarns alone, or knitting and weaving with other fibers, blended fibers, mixed fibers, and twisted yarns.

  In the polyamide fiber woven or knitted fabric of the present invention, examples of the woven structure to be applied include woven structures such as flat, twill, satin, ripple, amundsen, flat double and twill double structures. Also in the form of the knitted fabric, examples of the knitted fabric include warp knitted fabrics such as a half structure and a denby structure, and circular knitted fabric structures such as a punched structure, a mockroded structure, a tentacle structure, and a milling structure.

  In producing the polyamide fiber woven or knitted fabric of the present invention, the green machine woven or knitted as described above contains at least caustic alkali after dyeing in an acid-containing treatment solution having a pH of 3.5 or less before dyeing. It is only necessary to carry out heat treatment in an aqueous solution, and the others are generally applied in the dyeing, drying and finishing steps after scouring, relaxing treatment, drying and dry heat setting treatment, which are the usual production processes of woven and knitted fabrics Applies.

  As the type of acid used above, maleic acid is preferably used from the viewpoint of pH of the treatment liquid, production cost, and versatility. In addition, examples of the caustic alkali include strong alkalis such as sodium hydroxide, potassium hydroxide and lithium hydroxide, and sodium hydroxide is particularly preferably used. Although it is possible to use the benzyl alcohol derivative described in Patent Document 1 described above as a weight loss accelerator during heat treatment in an aqueous solution containing a caustic alkali within the range of the amount used without impairing the texture, the drug cost increases. It will be inferior in terms of economy.

  Heat treatment in an acid-containing treatment solution and heat treatment in an aqueous solution containing caustic alkali include elution in an immersion state by the suspension method (hanging weight loss) and elution in a stirring state using a liquid dyeing machine, etc. However, it is preferable to use a liquid dyeing machine in order to shorten the elution time and process by elution in a stirring state.

  The polyamide fiber woven or knitted fabric of the present invention can be treated with finished resin such as softness, water repellency, antifouling, antibacterial and antistatic, and moisture permeability by coating and laminating, as long as the object of the present invention is achieved. Waterproofing or urethane or acrylic coating can be applied.

  Applications of the polyamide fiber woven or knitted fabric of the present invention include jackets, pants, down jackets, rainwear, underwear, and T-shirts for casual applications, and ski wear, snowboard wear, and golf pants for sports applications. For outdoor use, climbing jackets and pants are listed. Moreover, it can be preferably used also for use as a base material or shoes.

  Next, the polyamide fiber woven or knitted fabric of the present invention will be described in more detail with reference to examples. Each characteristic value shown in the above description and in the examples is measured by the following method.

・ Total fineness of polyamide fiber spun yarn (cotton count):
The count defined in JIS L1095 (2010 edition 9.4.1) was measured to obtain the total fineness.

・ Single fiber fineness:
The single fiber fineness was measured by a method defined in JIS L1015 (2010 edition 8.5.1) B method.

(3) Single fiber length:
The single fiber length was determined by the method defined in JIS L1015 (2010 edition 8.4.1).
(4) Twist factor:
The twist coefficient was determined by the following formula (1) from the twist number T per inch calculated by the untwisting machine and the above (1) total fineness D for the polyamide fiber spun yarn obtained by decomposing from the woven or knitted fabric. . The twist coefficient was determined from the average value of 10 samples.
・ T = K × D ^1/2 ... (1)
However,
T = Number of twists per inch of spun yarn D = Total fineness (count) of spun yarn.

(5) Hollow ratio of single fiber:
The hollow ratio is a hole provided on a stainless steel preparation having a thickness of 0.5 mm at the end of a polyamide fiber spun yarn wrapped with rayon staple using a polyamide fiber spun yarn obtained by decomposing from a polyamide fiber woven or knitted fabric. A sample (single fiber) that was cut in parallel along both sides of the slide with a safety razor (monofilament) was used as a sample for cross-sectional observation. This sample was observed 500 times using a digital microscope “VHX-500” manufactured by KEYENCE, and the area measurement function was used to calculate the following formula (2) from the cross-sectional area S of the fiber including the hollow portion and the area s of the hollow portion. ). The hollow ratio was determined from the average value of 10 samples.
・ Hollow rate = (s / S) × 100 (%) (2)
(6) Tensile breaking strength and breaking elongation of polyamide fiber spun yarn:
Tensile strength at break and elongation at break were averaged by measuring 10 yarns at a tensile strength and elongation of JIS L1013 (2014) using a polyamide fiber spun yarn obtained by decomposing from a polyamide fiber woven or knitted fabric. Value. Regarding the tensile strength at break, the count of the total fineness obtained from the above (1) was converted to decitex, and the unit was cN / dtex. Moreover, the type of the tester was a constant speed extension type, and was carried out at a grip interval of 20 cm and a tensile speed of 20 cm / min. The toughness was obtained by multiplying the tensile breaking strength by the half power of the tensile breaking elongation, and the obtained value was taken as the toughness of the polyamide fiber spun yarn.

(7) Anti-pill property of polyamide fiber woven fabric:
The anti-pill property was measured with 2 sheets each for length and width according to JIS L 1076 (2006) A method (10 hours for woven fabric, 5 hours for knitted fabric), and the average value of 4 sheets was used. Evaluation is made with a value of 1 to 5, and the larger the value, the better the anti-pill property.

(8) Wear loss rate of polyamide fiber knitted fabric:
The wear weight loss rate was measured by the wear strength D method (Accelerator rotor method) of JIS L1096 (2014), and the average value of the three sheets was taken as the wear weight loss rate.

(9) Texture:
As for the texture, the following sensory determination was performed by five texture determiners, and ○ was accepted.
○: Moderate harshness and flexible texture.
(Triangle | delta): Although it is a moderate harsh feeling, it is a slightly hard and rough texture.
X: A firm feel and a hard and rough texture.

(Example 1)
Using a polyester copolymerized with polyethylene terephthalate 8.0 mol% dimethyl 5-sodium sulfoisophthalate as the core component, using nylon 66 as the sheath component, both components are melted separately, and a core-sheath type with a round cross section Using a spinneret, the sheath component and the core component are weighed to a mass ratio of 55/45, led to a core-sheath spinneret, melt-spun, and then the resulting yarn is cooled with cooling air After refueling and entanglement, it was once taken up at a take-up speed of 1500 m / min with a non-heated roller. Subsequently, the filament was stretched at a draw ratio of 3.0 times and crimped, and then cut to have a single fiber length of 51 mm, a single fiber fineness of 1.7 decitex, and a core component that is completely a sheath component. A core-sheath type composite fiber raw cotton (short fiber) having a round cross-section in the state of a single fiber coated with a fiber was obtained. Using the obtained core-sheath type composite fiber raw cotton, 0.76 count roving is made by a normal method, the fine spinning draft is increased by 21 times, and a twist of 16.8 T / inch is applied. A polyamide fiber spun yarn having a twist coefficient K of 4.2 and a cotton count of 16 s was obtained.

  The obtained polyamide fiber spun yarn was used for warp and weft to weave an ox fabric (raw machine) with a warp density of 100 yarns / inch and a weft density of 82 yarns / inch. The polyamide fiber spun yarn used for the weft was pre-twisted with a real twist of 300 T / m in the S twist direction using a double twister. The obtained raw machine was subjected to scouring, relaxation treatment, and dry heat setting treatment, which are normal production processes for fabrics.

The polyamide fiber fabric thus obtained was heated at 110 ° C. for 30 minutes in an acid-containing treatment solution having a pH of 2.0 of a treatment solution containing 2 g / L of maleic acid using a liquid dyeing machine. After the treatment, hot water washing and water washing were performed. Next, after heat treatment at 110 ° C. for 60 minutes in an aqueous solution containing 50 g / L of caustic alkali (sodium hydroxide), hot water washing and water washing were carried out to elute the copolyester of the core component. Subsequently, after dyeing with an acid dye using a flow dyeing machine, drying and dry heat setting are performed, the warp density is 110 yarns / inch, the weft density is 91 yarns / inch, and the basis weight is 195 g / m. ² Polyimide fiber fabric was obtained. The obtained polyamide fiber woven fabric had an appropriate feeling of elasticity and a soft texture, had an anti-pill resistance of 4.0 grade, and a wear loss rate of 22.5%. Moreover, the hollow rate of the single fiber of the polyamide fiber spun yarn obtained by decomposing from the obtained polyamide fiber fabric is 44.7%, the tensile strength at break is 1.33 cN / dtex, and the tensile elongation at break is 99.99. It was a polyamide fiber woven fabric having practical durability and high light weight that can be used for material applications such as sports for clothing, outerwear for casual use, knitted fabric, and shoes. The cross-sectional shape of the obtained polyamide fiber spun yarn is shown in FIG.

(Example 2)
Using the polyamide fiber spun yarn obtained in Example 1 as the warp, and using 320T-96f-nylon 6 long fiber processed yarn as the weft, the warp density is 104 / inch and the weft density is 80 / inch. Ox textured fabric (raw machine) was woven. The obtained raw machine was subjected to scouring, relaxation treatment, and dry heat setting treatment, which are normal production processes for fabrics. The polyamide fiber fabric thus obtained was heated at 115 ° C. for 30 minutes in an acid-containing treatment solution having a pH of 2.5 of a treatment solution containing 1 g / L of maleic acid using a liquid dyeing machine. After the treatment, hot water washing and water washing were performed. Next, after heat treatment at 110 ° C. for 60 minutes in an aqueous solution containing 50 g / L of caustic alkali (sodium hydroxide), hot water washing and water washing were carried out to elute the copolyester of the core component. . Subsequently, after dyeing with a liquid dyeing machine using an acid dye, drying and dry heat setting were performed, and the warp density was 113 / inch, the weft density was 94 / inch, and the basis weight was 275 g / m ² . A polyamide fiber fabric was obtained. The obtained polyamide fiber woven fabric had an appropriate elasticity and a soft texture, had an anti-pill resistance of 4.5 grade, and a wear loss rate of 21.3%. Moreover, the hollow rate of the single fiber of the polyamide fiber spun yarn obtained by decomposing from the obtained polyamide fiber fabric is 45.2%, the tensile strength at break is 1.29 cN / dtex, and the tensile elongation at break is 93. 1 (%), and was a polyamide fiber woven fabric having practical durability and high light weight that could be used for material applications such as sports for clothing, outerwear for casual use, garments and shoes.

(Example 3)
A processing solution containing maleic acid 2 g / L using 100% cotton 9th-dyed spun yarn as warp, polyamide fiber spun yarn obtained in Example 1 as weft, and cheese dyeing machine The heat treatment was performed at 110 ° C. for 30 minutes in an acid-containing treatment solution having a pH of 2.0, followed by hot water washing and water washing. Next, after heat treatment at 110 ° C. for 60 minutes in an aqueous solution containing 50 g / L of caustic alkali (sodium hydroxide), the polyamide was eluted with hot water and water to elute the copolyester of the core component A fiber spun yarn was obtained. Next, 100% cotton indigo-dyed yarn, cotton number 9 was used as the warp, and a polyamide fiber spun yarn in which the core component copolyester was eluted was used as the weft. The warp density was 60 / inch and the weft density was 40. A denim fabric with a / inch twill structure was woven. Next, the denim fabric is subjected to the usual processes of roasting, scouring, drying, and shrinking, and a polyamide fiber having a warp density of 69 / inch, a weft density of 45 / inch, and a basis weight of 270 g / m ² . A woven fabric was obtained. The obtained polyamide fiber woven fabric had an appropriate elasticity and a soft texture, had an anti-pill resistance of 4.5 grade, and a wear loss rate of 24.3%. Moreover, the hollow rate of the single fiber of the polyamide fiber spun yarn obtained by decomposing from the obtained polyamide fiber fabric is 43.2%, the tensile breaking strength is 1.35 cN / dtex, and the tensile breaking elongation is 80.7. It was a polyamide fiber woven fabric with practical durability and high light weight that can be used for material applications such as sports for clothing, outerwear for casual use, garments and shoes.

  Table 1 shows the evaluation results of the polyamide fiber fabrics obtained in Examples 1 to 3 above.

(Comparative Example 1)
The raw machine obtained in Example 1 was carried out in the same manner as in Example 1 except that the heat treatment at 110 ° C. for 30 minutes with the acid-containing treatment solution was not performed, and the warp density was 110 yarns / inch. A polyamide fiber woven fabric having a weft density of 91 yarns / inch and a basis weight of 235 g / m ² was obtained. The obtained polyamide fiber woven fabric has a moderate harshness and a soft texture, has an anti-pill resistance of 4.0 grade, and a wear loss rate of 15.9%. Has a hollowness of 34.6%, a tensile strength at break of 1.68 cN / dtex, and a tensile elongation at break of 28.8 (%). It was a polyamide fiber fabric that was insufficient for high lightness that could be developed for use. Moreover, the cross-sectional shape of the obtained polyamide fiber spun yarn is shown in FIG.

(Comparative Example 2)
After the raw machine obtained in Example 1 was subjected to heat treatment at 120 ° C. for 60 minutes in an aqueous solution containing 50 g / L of caustic (sodium hydroxide) without performing heat treatment of the acid-containing treatment liquid. Then, hot water washing and water washing were carried out to elute the core component copolymer polyester. Thereafter, the same procedure as in Example 1 was performed to obtain a polyamide fiber fabric having a warp density of 110 yarns / inch, a weft density of 91 yarns / inch, and a basis weight of 195 g / m ² . The obtained polyamide fiber fabric had a strong harsh feel and a hard and rough texture, an anti-pill property of 3.0 grade, and an abrasion loss rate of 30.5%. Moreover, the hollow rate of the single fiber of the polyamide fiber spun yarn obtained by decomposing the polyamide fiber fabric is 45.2%, the tensile strength at break is 1.02 cN / dtex, and the tensile elongation at break is 93.4%. Yes, it was a polyamide fiber fabric that was insufficient for practical durability that could be developed for material use such as outerwear, garments and shoes for sports use for clothing.

(Comparative Example 3)
The short fiber composite raw cotton obtained in Example 1 is woven in the same manner as in Example 1 except that the single fiber length is 38 mm and the twist coefficient K is changed to 3.6. After that, a polyamide fiber fabric was obtained. The obtained polyamide fiber woven fabric had an appropriate harshness and a soft texture, but had an anti-pill resistance of 3.0 grade and a wear loss rate of 22.0%. Moreover, the hollow rate of the single fiber of the polyamide fiber spun yarn obtained by decomposing from the obtained polyamide fiber fabric is 44.7%, the tensile strength at break is 1.31 cN / dtex, and the tensile elongation at break is 88. It was a polyamide fiber woven fabric with an anti-pill property that could be developed for material use such as sports for clothing, outerwear for casual use, knitted fabric, and shoes.

  Table 2 shows the evaluation results of the polyamide fiber fabrics obtained in Comparative Examples 1 to 3 above.

From the results of the above examples, the polyamide fiber woven or knitted fabric of the present invention has a single fiber fineness of the polyamide fiber spun yarn in the range of 0.8 dtex to 2.5 dtex, and the fiber length in the range of 40 mm to 60 mm. By setting the hollow ratio in the range of 35% to 50%, a polyamide fiber spun yarn having a tensile breaking strength of 1.20 cN / dtex or more and a tensile breaking elongation of 50% to 130% can be obtained. A polyamide fiber woven or knitted fabric including a polyamide fiber spun yarn composed of hollow fibers having excellent durability and high lightness in terms of anti-pill resistance, abrasion resistance, and strength, which is the object of the invention, is obtained. In addition, by performing the heat treatment in an aqueous solution containing at least caustic alkali after the heat treatment with the acid-containing treatment liquid, the above-mentioned polyamide fiber spun yarn can be obtained, and the production cost which is one of the objects of the present invention It is possible to provide a method for producing a polyamide fiber woven or knitted fabric that suppresses the above and improves versatility.

Claims (5)

A woven or knitted fabric including a polyamide fiber spun yarn satisfying the following requirements (1) to (5), having an anti-pill property of 3.5 or higher and a wear loss rate of less than 25% by mass. Polyamide fiber knitted fabric.
(1) The single fiber fineness is 0.8 dtex or more and 2.5 dtex or less,
(2) The single fiber length is 40 mm or more and 60 mm or less,
(3) The total fineness of the polyamide fiber spun yarn is 8 to 60 in cotton count, and the twist coefficient K is 4.0 to 4.5,
(4) The cross-sectional shape of the single fiber constituting the polyamide fiber spun yarn is completely covered with voids inside the fiber, and the hollow ratio of the single fiber is 35% or more and 50% or less ,
(5) The tensile strength at break of the polyamide fiber spun yarn is 1.20 cN / dtex or more, and the tensile elongation at break is 50% or more and 130% or less. The single fiber constituting the polyamide fiber spun yarn is a complete core-sheath type composite fiber made of polyester in which the sheath component is made of polyamide, the core component is copolymerized with the third component, and has an acid content of pH 3.5 or less. The polyamide fiber woven or knitted fabric according to claim 1, which is a single fiber obtained by heat treatment in an aqueous solution containing at least caustic alkali after the heat treatment with the treatment liquid and eluting the core component.   A woven or knitted fabric comprising a spun yarn composed of a complete core-sheath type composite fiber made of polyester in which the sheath component is made of polyamide and the core component is copolymerized with the third component is treated with an acid-containing treatment solution having a pH of 3.5 or less. A method for producing a polyamide fiber woven or knitted fabric, characterized in that after the heat treatment, the core component is eluted by heat treatment in an aqueous solution containing at least a caustic alkali to hollow the complete core-sheath composite fiber.   The method for producing a polyamide fiber woven or knitted fabric according to claim 3, wherein the heat treatment temperature of the acid-containing treatment is 100 ° C or higher and 115 ° C or lower, and the treatment time is 15 minutes or longer and 60 minutes or shorter.   The method for producing a polyamide fiber woven or knitted fabric according to claim 4, wherein the heat treatment temperature in the aqueous solution containing at least a caustic alkali is 95 ° C or higher and 115 ° C or lower and the treatment time is 30 minutes or longer and 90 minutes or shorter.