JP2009191437A - Sportswear formed of stretch knitted cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide sportswear formed of stretch knitted cloth excellent in an elongation ratio and an elongation-recovery ratio, having soft feeling and puff feeling texture, and suitable for a wide range of use for garment, garment material, or even industrial material. <P>SOLUTION: The sportswear formed of stretch knitted cloth contains 10 wt.% or more of composite fiber filaments which are produced by bonding two kinds of polyester polymer to each other along a fiber length direction side-by-side where at least one of the two kinds of polyester polymer includes polytrimethylene terephthalate having highly shrinking components, the other of the two kinds of polyester polymer includes polyester having slightly shrinking components, three-dimensional coil crimp is expressed, and single fiber coil phases of the structural yarns are different from each other , based on the whole weight of the structural yarn; and the average elongation ratio in lengthwise and crosswise directions is 55% or more and the average elongation-recovery ratio is 60% or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a sportswear using a stretch knitted fabric excellent in elongation rate and elongation recovery rate that can be suitably used for clothing, clothing materials, industrial materials, and the like.

  Compared to fabrics, knitted fabrics are more easily stretchable due to their fabric structure, and because of the ease of movement associated with the movement of the body, innerwear, outerwear, and sportswear for general clothing. Socks including pantyhose. Lining and interlining for clothing materials. It is used in many fields such as upholstery for industrial materials.

  However, in recent years, a knitted fabric that fits the body and is easy to move is desired, and various technical improvements have been proposed for the fibers used.

  For example, Patent Documents 1, 2, 3, and 4 disclose that a polyurethane-based elastic fiber called spandex is combined with nylon fiber, polyester fiber, cotton yarn, or the like to form a knitted fabric.

  However, although polyurethane-based elastic fibers have a high stretch property, when they are used together, the texture becomes hard as a characteristic property of polyurethane, and the texture and drape properties of the knitted fabric tend to decrease. Further, when mixed with polyester fiber, it is difficult to dye with disperse dyes for polyester, and there are problems of contamination of washing liquid and reduction of fastness to wet friction of fabric. For this reason, the dyeing process such as the enhancement of reduction cleaning becomes complicated, and it is difficult to dye in a desired color. Furthermore, since heat resistance is inferior, there is a problem of roughness of the knitted fabric surface. In addition, the cost of polyurethane-based elastic fibers is very high.

  In addition, for example, polyester fibers or nylon fibers are generally subjected to false twisting, and a method of imparting stretch properties by mixing fibers in which torque by twisting / untwisting is mixed is generally performed. It remains within the range of conventional stretch properties.

  Further, for example, a method of mixing polybutylene terephthalate fibers has been adopted. However, even if this fiber is mixed, a stretch knitted fabric that is still satisfactory cannot be obtained.

  Further, for example, Patent Documents 5 and 6 describe a side-by-side composite yarn of polyethylene terephthalate (hereinafter abbreviated as PET) having an intrinsic viscosity difference or an intrinsic viscosity difference, and Patent Document 7 describes a non-copolymerized PET and a highly shrinkable copolymer. A side-by-side composite yarn of polymerized PET is disclosed. However, the side-by-side type composite fiber uses the stretch of the three-dimensional coil caused by the difference in the shrinkage rate and the elastic recovery rate between the composite polymers for the stretch property. However, the side-by-side type composite fiber hardly develops the crimp under the fabric structure. Even so, there is a problem that the recovery rate after elongation is low due to deformation of the high shrinkage component.

Japanese Patent Laid-Open No. 9-176938 JP 9-316757 A JP-A-6-93560 Japanese Utility Model Publication No. 4-123287 Japanese Examined Patent Publication No. 44-2504 JP-A-4-308271 JP-A-5-295634

The present invention solves the above-described problems of the prior art, and sportswear using a knitted fabric having excellent stretch properties while maintaining mechanical strength, chemical resistance, dyeing processability, soft feeling, swell feeling, etc. Is intended to be provided efficiently and at low cost.

That is, the present invention provides a composite fiber filament in which two types of polyester polymers are bonded side-by-side along the fiber length direction , and at least one of the two types of polyester polymers is a polycondensation component. Trimethylene terephthalate, the other is polyester with a low shrinkage component, and three-dimensional coil crimping is manifested, and a composite fiber filament with different single fiber coil phases of the constituent yarns is used as a constituent yarn. It is a sportswear using a stretch knitted fabric that contains 10% or more, has an average stretch rate of 55% or more in the vertical and horizontal directions, and an average stretch recovery rate of 60% or more.

The stretch knitted fabric according to the present invention is superior in stretch rate and stretch recovery rate compared to conventional knitted fabrics, and has a soft feeling and a swelled texture, including those for clothing, clothing materials, and industrial materials. It can be applied to a wide range of fields and can be manufactured efficiently and at low cost.

It is explanatory drawing of the expansion | extension-extension recovery curve of this invention. It is a model figure which shows the fiber cross-sectional shape of the fiber used for this invention. 1 is an example of a knitting diagram of a knitted fabric of Example 1 and Comparative Example 1. FIG. It is an example of the knitting method of the knitted fabric of Example 2 and Comparative Example 2.

The stretch knitted fabric according to the present invention includes a composite fiber filament in which two types of polyester polymers are bonded in a side-by-side manner along the fiber length direction. Side-by-side type composite fiber is a polymer that has different types of polymers, intrinsic viscosity, copolymerization component, copolymerization rate, etc., and exhibits crimps due to differences in their elastic recovery rate and shrinkage characteristics. . In the case of a combination of polymers having different viscoelasticity, the stress is concentrated on the high viscosity side during spinning and drawing, so that the internal strain differs between the two components. Therefore, the high-viscosity side contracts due to the difference in elastic recovery rate after stretching and the heat shrinkage rate difference in the heat treatment process of the knitted fabric, and distortion occurs in the single fiber, which takes the form of a three-dimensional coil crimp. It can be said that the diameter of this three-dimensional coil and the number of coils per unit fiber length are determined by the shrinkage difference (including the difference in elastic recovery rate) between the high shrinkage component and the low shrinkage component. Smaller and more coils per unit fiber length.

  The coil crimp required as a stretch material has a small coil diameter, a large number of coils per unit fiber length (excellent stretch characteristics and good appearance), and good coil resistance (according to stretch recovery) The coil has a small amount of stickiness and is excellent in stretch retention), and also has a small hysteresis loss (excellent resilience and good fit) when the coil is recovered from elongation. The diameter of this coil is preferably 250 μm or less, and more preferably 200 μm or less.

  In addition, when the phase of the coil formed in the length direction of the filament yarn is the same as the coil phase of all the single fibers constituting the yarn, one filament yarn and one spring-like yarn Become. The knitted fabric using the yarn has a soft feeling with a flaming, and the surface has a fine texture and a beautiful knitted fabric can be obtained. On the contrary, when the coil phases of all the single fibers constituting the yarn are different, one filament yarn becomes a false twisted / untwisted temporary twisted yarn having one fluff. The knitted fabric using this yarn has a soft feeling with further flaming, and a flat, beautiful surface knitted fabric can be obtained. When a stretch knitted fabric is obtained, there is no particular limitation as to which yarn is used, and it may be properly used depending on the purpose, preference and the like.

  While satisfying all these requirements, it has a characteristic as polyester, for example, moderate tension, drape, and high dyeing fastness, so that it can be made into a stretch material excellent in total balance. Here, in order to satisfy the coil characteristics described above, the characteristics of the high shrinkage component (high viscosity component) are important. Since the expansion and contraction characteristics of the coil are dominated by the expansion and contraction characteristics of the high contraction component with the low contraction component as a fulcrum, the polymer used for the high contraction component is required to have high extensibility and recovery characteristics.

  Accordingly, as a result of intensive studies to satisfy the above-mentioned properties without impairing the properties of the polyester, the present inventors use a polyester mainly composed of polytrimethylene terephthalate (hereinafter abbreviated as PTT) as a high shrinkage component. I found it preferable. PTT fibers have the same mechanical properties and chemical properties as polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate (hereinafter abbreviated as PBT) fibers, which are typical polyester fibers, and also have stretch recovery properties. It is extremely excellent. This is because the methylene chain of the alkylene glycol part in the crystal structure of PTT is a Gauche-Gauche structure (the molecular chain is bent at 90 degrees), and further, the density of restraint points due to the interaction between benzene rings (stacking, parallel) This is because the molecular chain can be easily stretched and recovered by the rotation of the methylene group.

  Here, PTT is a polyester obtained using terephthalic acid as the main acid component and 1,3-propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. Examples of copolymerizable compounds include isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, 5-sodium sulfoisophthalic acid and other dicarboxylic acids, ethylene glycol, diethylene glycol, butanediol, neopentyl glycol And diols such as cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, and the like, but are not limited thereto. If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives as an antioxidant, coloring pigments, and the like may be added.

  The low-shrinkage component is not particularly limited as long as it is a fiber-forming polyester that has good interfacial adhesion with PTT, which is a high-shrinkage component, and has stable yarn-making properties. PTT, PET, and PBT having fiber forming ability are preferable in consideration of physical properties and raw material prices.

  In addition, the composite ratio of both components is preferably in the range of high shrinkage component: constant shrinkage component = 75: 25 to 35:65 (% by weight) in terms of yarn production and dimensional homogeneity of the coil in the fiber length direction. : The range of 35-45: 55 is more preferable.

  In addition, the fiber cross-sectional shape of the side-by-side type composite fiber is a round cross section, a triangular cross section, a multi-lobe cross section, a flat cross section, a Dalma type cross section, a C type cross section, an M type cross section, an H type cross section, an X type cross section, an I cross section. The mold cross section and + mold cross section can be used, but from the viewpoint of crimp development and texture, when aiming for a semicircular side-by-side (a) with a round cross section as shown in FIG. When aiming for a hollow side-by-side (d) and dry texture, a triangular cross-section side-by-side (g) is preferably used.

  The side-by-side type composite fiber is preferably composed of filament yarns having a single yarn fineness of 0.1 to 11 dtex and a total fineness of 11 to 550 dtex.

  By setting the single yarn fineness to 11 dtex or less, the texture of the knitted fabric can be made soft and can be preferably used for clothing. Moreover, composite yarn-making becomes favorable by setting it as 0.1 dtex or more, More preferably, 1.1 dtex or more, Moreover, a crimped structure is reflected and favorable stretch property can also be obtained. Further, yarns having different single yarn finenesses such as different fineness mixed yarns may be used. Such a different fineness mixed yarn is preferable from the viewpoint of making a knitted fabric having softness and tension.

  The mixing ratio of the side-by-side type composite fiber to the constituent yarn of the knitted fabric is required to be 10% or more, preferably 20% or more, and more preferably 30% or more. When the mixing ratio is less than 10%, satisfactory characteristics cannot be obtained with respect to the average elongation rate in the vertical and horizontal directions and the average elongation recovery rate of the knitted fabric described later. As a method of mixing side-by-side type composite fibers into knitted fabrics, normal knitting, twisting, aligning, covering, blending, etc. with other materials can be adopted. These may be properly used according to the knitting structure.

  Other materials include synthetic fibers such as polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, polyurethane fibers or acetate fibers or semi-synthetic fibers or recycled. Fibers such as viscose rayon, cellulosic fibers including cupra, milk protein fibers, protein fibers including soy protein fibers, polylactic acid fibers, or the use of these filament yarns, spun yarns, or blended yarns In addition, there are plant-based natural fibers including cotton and hemp, or animal-based natural fibers including wool, cashmere and silk, or a blended yarn of these.

Further, the stretch knitted fabric according to the present invention is characterized in that an excellent elongation rate and elongation recovery rate can be obtained without mixing polyurethane elastic fibers as in the prior art. In order to obtain the characteristics, polyurethane-based elastic fibers may be used in a range that does not impair the texture and dyeability.

The stretch knitted fabric according to the present invention comprises a weft knitted fabric or a warp knitted fabric. As the weft knitted fabric, there are a circular knitted fabric, a single circular knitted fabric, a double circular knitted fabric, a flat knitted fabric, a sock knitted fabric, and a molded knitted fabric, which can be knitted by each dedicated knitting machine. Also, as the warp knitted fabric, single tricot knitted fabric and double tricot knitted fabric that are tricot knitted fabric, single raschel knitted fabric that is raschel knitted fabric, double raschel knitted fabric, flat miranese knitted fabric that is miranese knitted fabric and circular miranese knitted fabric There are knitted fabrics, and these can be knitted by each dedicated knitting machine.

  Further, it is preferable that the knitting conditions in the knitting are made slightly larger in loop length and runner length than the knitting conditions for normal yarn use, and the knitting density is made coarse. By this, the composite fiber bonded to the side-by-side mold passes through the dyeing process, so that the crimp expression is fully exhibited and a knitted fabric with excellent stretch, softness, and bulging feeling is obtained. Can do.

  Heat treatment, scouring and dyeing of the knitted raw machine knitted fabric may be carried out in accordance with ordinary knitted fabric processing methods, and no special equipment is required. In order to more effectively express the shrinkage as a spring structure, the relaxation / scouring heat treatment temperature is preferably 80 ° C. or higher. In addition, as ancillary processing at the dyeing stage, water repellent processing, antifouling processing, antibacterial processing, deodorization processing, deodorization processing, flame retardant processing, sweat absorption processing, moisture absorption processing, antifungal processing, UV absorption processing, weight loss processing, etc. Further, it is desirable that the post-processing is appropriately performed according to the required characteristics of the end use, such as calendering, embossing, wrinkling, raising, printing, and opal processing.

In the stretch knitted fabric according to the present invention , it is important that the average elongation rate in the vertical and horizontal directions is 55% or more, and the average elongation recovery rate in the vertical and horizontal directions is 60% or more.

  The average stretch rate and the average stretch recovery rate can be measured by the method shown in the examples. The stretch rate represents the degree of stretch of the knitted fabric. It is easy to follow the movements of the body, and the knitted fabric follows the intense movements of sports etc., making it easy to move and less fatigue. The stretch recovery rate indicates the degree of recovery that the knitted fabric stretched by the movement of the body tries to quickly return to the original state, and the larger this value, the more fit it will be when worn as a wear. Rich and easy to move.

  It is necessary to consider the elongation rate and the elongation recovery rate by averaging the values in the warp direction and the transverse direction of the knitted fabric. This means that when the garment is actually worn and moved, the knitted fabric is stretched in three dimensions according to the roundness of the human body. Because. This three-dimensional stretch characteristic correlates well with the average stretch rate, which is the average stretch rate in the warp direction and the horizontal direction of the knitted fabric, and the average stretch recovery rate.

  The average elongation of the knitted fabric of the present invention needs to be 55% or more, preferably 70% or more, and more preferably 80% or more. If it is less than 55%, it is not preferable because it is difficult to follow the movement of the body, and it is easy to get tired.

  The average elongation recovery rate is preferably 60% or more, more preferably 70% or more, and still more preferably 80% or more. If it is less than 60%, the knitted fabric stretched by exercise or the like will be stretched, and it will be difficult to follow the movement of the body because it is inferior in the fit to the body. Moreover, it will be inferior in appearance as wear.

The stretch knitted fabric according to the present invention can be widely developed as follows by appropriately selecting. For example, in a circular knitted fabric in a weft knitted fabric, sportswear, swimwear, underwear, uniform wear, outerwear, seat sheets including car seats, shoe materials, clothing interlinings and linings In a flat knitted fabric, it can be preferably used for sweaters, cardigans, gloves, etc., and in a sock knitted fabric, pantyhose, tights, socks and the like. On the other hand, in the tricot knitted fabric in the warp knitted fabric, sportswear, swimwear, underwear, uniform wear, outerwear, seat sheets including car seats, shoe materials, clothing interlining and In raschel knitted fabrics such as linings, it can be preferably used for foundations for innerwear, laces, seat sheets including car seats, shoe materials and the like.

  Hereinafter, the present invention will be described using examples. Each evaluation in the examples was performed as follows.

(1) Average elongation rate First, the elongation rate was tested in accordance with the grab method of the constant speed elongation method of JIS L 1018 "Testing method of knitted fabric". That is, three 10 cm × about 15 cm test pieces were sampled in the vertical and horizontal directions. Using a constant-speed extension type tensile tester with a self-recording device, both the upper and lower grips are 2.54cm x 2.54cm on the front side and 2.54cm x 5.08cm on the back side, and the grip interval is 7.6cm. It was fixed to the grip by removing the slack and tension.

This was stretched to a load of 17.7 N (1.8 kg) at a tensile speed of 10 cm / min, and the gripping interval at that time was measured. Immediately thereafter, the load was returned to 7.6 cm, which was the original gripping interval, in the direction of removing the load. This behavior due to load-deweight was drawn as a load-elongation-recovery curve on a self-recording recorder (see FIG. 1).
Based on this, the elongation LA (%) was obtained by the following formula and expressed as an average value of three sheets.
Elongation rate LA (%) = [(L1-L) / L] × 100
L: Grasp interval (mm)
L1: Grasp interval when extended to 17.7N (mm)
The elongation rates for the warp direction and the horizontal direction of the knitted fabric were added, and the added value was halved to obtain the average elongation rate.

(2) Average elongation recovery rate Further, the elongation recovery rate LB (%) is based on the load-elongation-recovery curve drawn with the self-recording recorder, and the residual strain rate L2 ( %), The elongation recovery rate LB (%) was calculated by the following formula, and expressed as the average value of the three sheets.
Elongation rate recovery rate LB (%) = (L3 / L1) × 100
The elongation recovery rate for each of the warp direction and the horizontal direction of the knitted fabric was added, and the added value was halved to obtain an average elongation recovery rate.

(3) Soft feeling
The fabric after dyeing was held in hand, and sensory evaluation by 10 persons was performed in three stages as follows.
Judgment display ○: Soft feeling is very good
Δ: Soft feeling is similar to general knitting fabric
X: There is no soft feeling.

(4) Puffiness
The fabric after dyeing was held in hand, and sensory evaluation by 10 persons was performed in three stages as follows.
Judgment display ○: Very good feeling of swelling
Δ: The feeling of swelling is similar to that of general knitted fabric
X: There is no feeling of swelling.

(5) Comprehensive evaluation Displayed in two stages as follows.
Judgment display ○: Excellent as stretch knitted fabric
X: Inferior as a stretch knitted fabric.

[Example 1]
Using a 28G double-sided circular knitting machine, the component yarns a and b in the knitting diagram of FIG. 3 are both PTT / PET side-by-side composite filament yarns (fiber cross section of FIG. 2a) using 83 dtex 36 filament yarns. Each of the yarn feeders F1 and F2 was fed, and an interlock structure knitted fabric made of 100% PTT / PET side-by-side composite filament yarn was knitted.

The raw machine was subjected to relaxation and refining, dyeing, and finishing set according to a normal polyester circular knitting dyeing method to obtain a 195 g / m ² knitted fabric. The obtained knitted fabric was excellent in stretch properties, with a vertical and horizontal average elongation rate of 75% and an average height recovery rate of 82%. Moreover, there was also a soft feeling and a bulging feeling by sensory evaluation, and it was suitable as a stretch knitted fabric comprehensively. Detailed results are shown in Table 1.

[Example 2]
In a 28G single tricot machine, PTT / PET side-by-side composite filament yarn (fiber cross section in Fig. 2a) 44 decitex 24 filaments is placed on the back-side component yarn c in the knitting diagram of Fig. 4, and the front-side component yarn Polyester filament yarn (“Tetron” manufactured by Toray Industries, Inc.) 44 decitex 36 filament, which is a normal yarn, was arranged on the yarn D, and a half-textured knitted fabric was knitted. The yarn mixing ratio in this knitted fabric design was 18% for the PTT / PET side-by-side composite yarn and 82% for the normal yarn.

This raw machine was subjected to relaxation / smelting, dyeing and finishing set in accordance with a normal polyester warp knitting method, and a knitted fabric of 210 g / m ² was obtained. The obtained knitted fabric had excellent stretch properties, with a vertical and horizontal average elongation of 71% and an average height recovery of 89%. Moreover, there was also a soft feeling and a swell feeling by sensory evaluation, and it was suitable as a stretch knitted fabric comprehensively. Detailed results are also shown in Table 1.

[Comparative Example 1]
Using the same circular knitting machine as in Example 1, both the constituent yarns I and B in the knitting diagram in FIG. 3 are polyester filament temporary twisted yarn 83 dtex 36 filament yarn, which is a normal yarn, and a yarn feeder F1 in the knitting diagram is shown. Each of the yarns F2 was fed, and an interlock structure knitted fabric composed of 100% normal yarn was knitted.

This green machine was subjected to the same dyeing method as in Example 1 to obtain a knitted fabric of 148 g / m ² . The obtained knitted fabric had an average height recovery rate of 51%, although the vertical / horizontal average elongation rate was 63%. Moreover, the soft feeling and bulging feeling by sensory evaluation were also inferior, and it was judged that it was unsuitable as a stretch knitted fabric comprehensively. Detailed results are also shown in Table 1.

[Comparative Example 2]
Using the same warp knitting machine as in Example 2, the back side constituent yarn c in the knitting diagram of FIG. 4 and the front side constituent yarn d are arranged with polyester filament yarn 44 dtex 36 filaments as normal yarn, and normal yarn A half-structured knitted fabric consisting of 100% was knitted.

This raw machine was subjected to the same dyeing process as in Example 2 to obtain a knitted fabric of 216 g / m ² . The obtained knitted fabric had an average height recovery rate of 70% but an average elongation rate of 52%, which was inferior. Moreover, the soft feeling and bulging feeling by sensory evaluation were also inferior, and it was judged that it was unsuitable as a stretch knitted fabric comprehensively. Detailed results are also shown in Table 1.

L1: Elongation of knitted fabric L2: Elongation of strain of knitted fabric L3: Recovery elongation of knitted fabric ag: Fiber cross-sectional shape F1-F2: Yarn feeder NO of knitting machine
I ~ Ha: Knitting fabric yarn

Claims (4)

A composite fiber filament in which two types of polyester polymers are bonded side-by-side along the fiber length direction , and at least one of the two types of polyester polymers is polytrimethylene terephthalate, which is a highly shrinkable component. The other one is a low-shrinkage component polyester, and three-dimensional coil crimps are expressed, and the composite yarns having different single-fiber coil phases of the constituent yarns contain 10% or more of the total weight of the constituent yarns, Sportswear using stretch knitted fabric with an average stretch rate of 55% or more in the vertical and horizontal directions and an average stretch recovery rate of 60% or more. The sportswear using the stretch knitted fabric according to claim 1, wherein at least one of the two kinds of polyester polymers is mainly composed of polytrimethylene terephthalate. The sportswear using the stretch knitted fabric according to claim 1 or 2, wherein the composite fiber bonded to the side-by-side type has a single yarn fineness of 0.1 to 11 dtex and a total fineness of 11 to 550 dtex. Sportswear using the stretch knitted fabric according to any one of claims 1 to 3, which is a weft knitted fabric or a warp knitted fabric.

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