JP2003064558A - Comfortable knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a comfortable knitted fabric suitable for a clothes material having an excellent cool feeling, especially an innerwear in direct contact with the skin without sweatiness and stickiness even during wearing for a long period. SOLUTION: This comfortable knitted fabric is a knitted fabric of a two-layer structure composed of a right side layer and a back side layer which is mainly composed of a moisture absorbing and releasing synthetic fiber filament yarn. The comfortable knitted fabric has >=0.13 W/cm<2> consumed quantity of heat transferred from the back side to the inside of the knitted fabric under environmental conditions of 20 deg.C and 65%RH. The moisture absorbing and releasing synthetic fiber filament yarn is preferably core-sheath conjugated type moisture absorbing and releasing synthetic fibers comprising a core component composed of a modified material of a polyalkylene oxide obtained by reacting an alkylene oxide with a polyol and an aliphatic diisocyanate compound or the modified material and a polyamide and a sheath component composed of a polyamide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a comfortable knitted fabric having excellent coolness, water absorption and moisture absorption / release properties, and particularly suitable for innerwear which comes into direct contact with the skin.

[0002]

2. Description of the Related Art Synthetic fibers are superior to natural fibers such as cotton, hemp, and wool in strength, abrasion resistance, dimensional stability, wash-and-wear property, quick-drying property, etc. Widely used. However, synthetic fibers
Generally, it does not have the excellent anti-static property, water absorption property, and moisture absorption / release property that natural fibers have, and when worn in the winter, clinging to dust or adhesion of dust due to static electricity, and when worn in the summer, due to sweating, stickiness, etc. And was inferior in terms of comfort to natural fibers.

In order to solve these problems, attempts have been made to impart water absorption and moisture absorption / desorption properties to synthetic fibers. For example, as a method of imparting the above function to nylon fibers and polyester fibers by post-processing, a method of graft-polymerizing vinyl carboxylic acid using a radical initiator or an electron beam (JP-A-4-146271 and JP-A-4-272272).
However, this method has various problems such as reduction in strength of fibers due to processing, hardening of texture, and lack of durability of effect. In addition, a composite fiber containing a polyalkylxylene glycol in the production stage of the raw yarn (Japanese Unexamined Patent Publication No. 39-5214), a hollow fiber made of a fiber-forming polymer having a through groove from the fiber surface to the hollow portion (Japanese Unexamined Patent Publication No. No. 60-37203), polyester fibers in which an organic sulfonic acid compound is uniformly dispersed are treated with alkali, and microporous fibers (JP-A-60-167969) are proposed. However, none of these fibers has a low level of hygroscopicity, and they do not have both water absorbing performance and moisture absorbing / releasing performance to a sufficient level at the same time.

In order to solve these problems, a core-sheath composite fiber (Japanese Unexamined Patent Publication No. 2-99612) is proposed in which a resin having a water absorption capacity of 10% or more is used as a core and polyester is used as a sheath. ing. However, although this fiber has sufficient water absorption and moisture absorption / release properties during the production process of the raw yarn, the sheath part of the fiber is damaged during the dyeing process, especially during the weight reduction process, and the hygroscopic resin as the core component is eluted. Therefore, there is a problem in that the initial water absorption and moisture absorption / desorption properties are impaired.

Further, Japanese Patent Application Laid-Open No. 11-241226 discloses that
There has been proposed a core-sheath hygroscopic fiber having a sheath component made of polyamide and a core component made of a mixture of polyamide and a modified polyalkylene oxide. This fiber has sufficient water absorption and moisture absorption / release properties, but even if this fiber is simply used as a woven or knitted product, the dimensional stability of the fabric is poor and it has been difficult to put it into practical use.

Clothing made of synthetic fiber requires coolness, especially when it is worn in summer, and summer clothes take into consideration breathability, contact area with skin, thermal conductivity of material, and the like. Although it has been improved, the current situation is that none of the natural fibers have a cool feeling.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, has a high degree of water absorption and hygroscopicity, has no stuffiness or stickiness even when worn for a long time, and has a cool feeling when worn. An object of the present invention is to provide a comfortable knitted fabric which is suitable for an innerwear which has a good property and which is in direct contact with a shirt fabric, particularly a skin.

[0008]

The inventor of the present invention arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention has the gist of the following configuration. (1) A two-layer structure knitted fabric composed of a front surface layer and a back surface layer, the back surface layer mainly composed of moisture-absorbing / desorbing synthetic fiber filaments, and the back surface to the inner surface of the knitted material under the environmental condition of 20 ° C. × 65% RH. A comfortable knitted fabric characterized by having a transition heat consumption of 0.13 W / cm ² or more. (2) moisture-absorbing and desorbing synthetic fiber filaments, a polyalkylene oxide modified product obtained by the reaction of an alkylene oxide and a polyol and an aliphatic diisocyanate compound or a core component composed of the modified product and polyamide, and a sheath component composed of polyamide. The comfortable knitted fabric according to the above (1), which is composed of a core-sheath composite type moisture absorbing / releasing synthetic fiber.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. The comfort knitted fabric of the present invention is a two-layer structure knitted fabric composed of a front surface layer and a back surface layer, but it is necessary to mainly and preferably use moisture absorbing / releasing synthetic fiber filaments in the yarns constituting the back surface layer. Is. The moisture absorptive and desorptive synthetic fiber referred to in the present invention is a synthetic fiber having a high moisture absorptive and desorptive property, and as such a synthetic fiber, a compound having a moisture absorptive and desorptive property and a fiber-forming polymer are blended to form a yarn. A core-sheath composite fiber produced by using a fiber-forming polymer as a core component or a core component or a blend of a moisture-absorbing / releasing compound and a fiber-forming polymer. Etc. By using a hygroscopic synthetic fiber filament in the back layer,
A high level of water absorption performance and moisture absorption / release performance can be imparted to the knitted fabric.

Here, as the fiber-forming polymer, polyamides such as nylon 6, nylon 66 and nylon 46,
Examples thereof include polyethylene terephthalate, polyester obtained by copolymerizing a polyethylene terephthalate unit with a third component, polyester such as polybutylene terephthalate and polypropylene terephthalate.

As the compound having a moisture absorbing / releasing property, any compound having a good moisture absorbing property and a small change in color tone may be used.
A modified polyalkylene oxide obtained by reaction with a polyalkylene oxide, a polyol and an aliphatic diisocyanate compound is preferably used. As the polyalkylene oxide used as a raw material of the modified polyalkylene oxide, polyethylene oxide, polypropylene oxide and a copolymer of both, as the polyol, ethylene glycol, diethylene glycol, glycols such as propylene glycol, as the aliphatic diisocyanate, Examples thereof include dicyclohexylmethane-4,4-diisocyanate and 1,6-hexamethylene diisocyanate. When such a polyalkylene oxide modified product is used as a compound having a moisture absorbing / releasing property, it results from an imide ring formed by a resonance structure of an isocyanate group and an aromatic ring as seen when an aromatic isocyanate compound is used. Yellowing is suppressed, the fibers do not yellow even after long-term use, and a composite fiber having excellent weather resistance can be obtained.

The content of the modified polyalkylene oxide as the moisture absorbing / releasing compound of the moisture absorbing / releasing synthetic fiber in the present invention is preferably in the range of 0.5 to 60% by mass. The content of modified polyalkylene oxide is
If it is less than 0.5% by mass, the desired moisture absorption and desorption property may not be obtained, and if the content exceeds 60% by mass, there may be a problem in the spinnability.

The core-sheath composite ratio in the case of the core-sheath composite fiber varies depending on the polymer used and the like, but the mass ratio is 15
It is preferably in the range of / 85 to 85/15, and if the proportion of the core component is smaller than this, moisture absorption and desorption properties are inferior, and if the proportion of the core component is large, problems in spinnability may occur.

The moisture-absorbing / desorbing synthetic fiber filament used in the present invention is a fiber which, unlike ordinary synthetic fiber filaments, absorbs moisture and stores it in the fiber core portion, and releases moisture to the outside air according to changes in the humidity of the external environment. . Moisture absorbed by the fibers is released to the fibers, and heat is taken away from the fibers when the fibers are separated, so that the wearer can feel cool. For this reason,
The amount of heat consumed for transfer is higher than that of ordinary synthetic fibers, and since the amount of moisture absorbed increases in an environment with higher humidity, the amount of heat consumed for transfer is also higher.

The comfortable knitted fabric of the present invention is a two-layer structure knitted fabric comprising a front surface layer and a back surface layer, but it is necessary that the moisture absorbing / releasing fibers constituting the back surface layer are exposed on the back surface. This is because the moisture-absorbing and desorbing fibers contact the skin to give the wearer a cool feeling, and at least 50% or more of the back surface,
Preferably, the coolness cannot be sufficiently imparted unless it is exposed on the entire surface.

The comfort knitted fabric of the present invention is 20 ° C. × 65
The transition heat consumption under environmental conditions of% RH is 0.13 w / cm
² or more, preferably required to be 0.14 w / cm ² or more. The higher the heat consumption, the more the heat of the skin surface is instantaneously transferred to the knitted side, and the human body can be given a cool feeling. When the consumed heat amount is less than 0.13 w / cm ² , the heat on the skin surface is difficult to move to the knitted side, which makes it difficult to obtain a cool feeling when worn.

In the present invention, the fiber used for the surface layer which constitutes the two-layer structure knitted material together with the back surface layer is not particularly limited, but the back surface layer is formed by a modified cross-section fiber such as W-shaped cross-section polyester fiber. A combination is preferred which has a single filament fineness smaller than that of the moisture-absorbing / desorbing synthetic fiber filaments and easily develops a function of absorbing water from the back surface layer by a capillary phenomenon and diffusing it to the front surface side.

[0018]

The comfort knitted fabric of the present invention is a two-layer structure knitted fabric comprising a front surface layer and a back surface layer, and the back surface layer mainly composed of moisture-absorbing / desorbing synthetic fiber filaments. The back layer, which is the side, becomes the contact endothermic layer,
Moreover, since the transferred heat consumption of the knitted fabric in an environment of 20 ° C x 65% RH is 0.13 w / cm ² or more, it has a cool feeling when worn and does not feel stuffy or sticky even when worn for a long time, and particularly comes into direct contact with the skin. A material for clothing suitable for innerwear.

[0019]

EXAMPLES Next, the present invention will be described more specifically by way of examples. In addition, the measurement and evaluation of the performance in the examples were performed by the following methods. (1) Moisture content The sample was dried at a temperature of 105 ° C for 2 hours and the weight W was measured, and then the humidity V was measured by conditioning the humidity for 2 hours under the conditions of 34 ° C and 90% relative humidity. The water content was calculated. Moisture content (%) = [(V−W) / W] × 100 (2) Transition heat consumption Using Thermo Lab II (KES-F-M7) manufactured by Kato Tech Co., temperature conditions of 20 ° C. and relative humidity of 65% Under the sample (6
(6 x 6 cm) is placed on a sample stand (Water Box: 22 ° C), and when a 32 ° C heat storage plate (3 x 3 cm, made of pure copper) is brought into contact with it from above, the peak value of heat flow from the heat storage plate to the sample side. It is represented by (w / cm ² ). The larger the value of the heat consumption of transition, the higher the coolness. (3) Wearing test An inner shirt was sewn with the prepared knitted fabric, and a 10 person wearing monitor performed a sensory evaluation on coolness when worn, presence of stuffiness, and stickiness at the following three levels. ◯: Both cool feeling and hygroscopicity are excellent. Δ: Either coolness or hygroscopicity is inferior in performance.

Example 1 85 parts by mass of nylon 6 having a relative viscosity of 2.6 as measured in a m-cresol solvent at a concentration of 0.5 g / dl and a temperature of 20 ° C., polyethylene oxide, 1,4-butanediol and dicyclohexylmethane 4,4 Modified polyalkylene which is a reaction product of diisocyanate (absorption capacity of 1 g is 35 g) 15
A core-sheath composite spinning having a mixture of 4 parts by mass and a core component, nylon 6 having a relative viscosity of 2.6 as a sheath component, a mass ratio of core component / sheath component of 50/50, and 24 discharge holes. Melt-spin at a spinning temperature of 255 ° C using a spinneret, blow air at 18 ° C on the spun yarn to cool and apply an oil agent, and then wind at 1300 m / min and draw 3.0 times. Thus, a 78 dtex / 24f core-sheath type moisture absorbing / releasing synthetic fiber filament was obtained.

Next, using a 28-gauge double-sided circular knitting machine, a normal 83 dtex was formed on the fabric surface (cylinder needle side) with the structure shown in FIG.
A / 36f polyethylene terephthalate false twist textured yarn and a moisture absorbing / releasing synthetic fiber filament were arranged on the back surface of the fabric (dial needle side) to knit a raw machine. Dyeing is performed at 100 ° C using a carrier, and SR1000 manufactured by Takamatsu Yushi Co., Ltd. in the bath.
(Anionic hydrophilic finishing agent) was used to absorb water using 2% owf, then the contamination to polyamide was removed and finishing set was performed, and 43% by mass of the hygroscopic synthetic fiber filament
A two-layer structure knitted fabric containing it was obtained.

Comparative Example 1 Absorption was performed in the same manner as in Example 1 except that a moisture absorbing / releasing synthetic fiber filament was arranged on the surface of the cloth and a normal 83dtex / 36f polyethylene terephthalate false twisted yarn was arranged on the back surface of the cloth to knit a raw fabric. A two-layer structure knitted fabric containing 54 mass% of moisture-releasing synthetic fibers was obtained.

COMPARATIVE EXAMPLE 2 A common 83dtex / 36f polyethylene terephthalate false twist textured yarn was arranged on both the front and back sides of the fabric to knit a raw machine, dyed under the conditions of polyester, water-absorbed in the bath, and then finished set. A two-layer structure knitted fabric was obtained in the same manner as in Example 1 except that Table 1 shows the evaluation results of the knitted fabrics obtained in Example 1 and Comparative Examples 1 and 2.

[0024]

[Table 1]

As is clear from Table 1, the knitted fabric of Example 1 had excellent moisture absorbing / releasing properties and coolness, and was suitable as a material for clothing, particularly as an inner material. On the other hand, the knitted fabric of Comparative Example 1 is excellent in moisture absorption and desorption, but inferior in coolness when worn, and the knitted fabric of Comparative Example 2 is inferior in both moisture absorption and desorption and coolness. It was

[0026]

Industrial Applicability According to the present invention, there is provided a knitted fabric which is excellent in coolness when worn, has a high moisture absorption / release property, is free from stuffiness and stickiness in the garment, and is a clothing material having excellent wearing comfort.

[Brief description of drawings]

FIG. 1 is a knitting organization chart according to an embodiment (example) of the present invention.

[Explanation of symbols]

1-8 Each yarn feeder of knitting structure A yarn that forms the surface layer of the knitted fabric B Yarn forming the back layer of the knitted fabric C cylinder needle D dial needle

Claims (2)

[Claims] 1. A two-layer structure knitted fabric comprising a front surface layer and a back surface layer, the back surface layer being composed mainly of moisture-absorbing / desorbing synthetic fiber filaments, the back surface of the knitted material under an environmental condition of 20 ° C. × 65% RH. Inward heat consumption is 0.13 W / cm ²
The comfort knitted fabric characterized by the above. 2. A moisture absorbing and desorbing synthetic fiber filament, a polyalkylene oxide modified product obtained by the reaction of an alkylene oxide with a polyol and an aliphatic diisocyanate compound, or a core component composed of the modified product and polyamide, and a sheath composed of polyamide. The comfortable knitted fabric according to claim 1, which is a core-sheath composite type moisture absorptive and desorptive synthetic fiber composed of components.