Blended woven or knitted fabrics containing polyerethane elastic fibers and process for the production thereof

a technology of polyurethane elastic fibers and which is applied in the field of blended woven or knit fabrics, can solve the problems of yarn slippage, deformation, deformation, and slipping of yarn, and achieve the effects of reducing the number of woven or knitted fabrics

Inactive Publication Date: 2006-02-09
NISSHINBO IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] As a result of extensive investigations, we have discovered that when a blended woven or knit fabric which contains highly fusible polyurethane elastic filaments typically obtained by melt-spinning a polymer synthesized from a prepolymer prepared by the reaction of a polyol with a diisocyanate, wherein preferably at least 50 wt % of the starting polyol is a polyether polyol, a...

Problems solved by technology

However, when an article made by cutting and sewing a polyurethane elastic filament-containing blended fabric is repeatedly stretched, it deforms, causing the fabric to lose its uniformity and making it subject to problems such as deformation, yarn slippage, grinning, fraying, running and edge curling.
In sewn areas, repeated extension also tends to cause polyurethane elastic filaments to pull away from the seams (“slip-in”).
In an area of the fabric where such slip-in has occurred and elastic filaments have left from a seam, the loss of shrinkage force tends to give rise to places of uneven density in the fabric, which can render an item of apparel unfit for use.
However, lowering the degree of extension of polyurethane elastic filaments as in (1)(i) above also lowers the stretch properties of the fabric and increases costs owing to the larger amount of polyurethane elastic filaments that is used as a result.
Weakening the shrinkage force of the polyurethane elastic filaments by increasing the heat-setting temperature as in (1)(ii) above is undesirable because this changes the tactile qualities of the fibers with which the polyurethane elastic filaments are used and also lowers the colorfastness of the woven or knit fabric.
However, because such fusion requires the fabric to be heat set at a high temperature, the tactile qualities of the fibers with which the p...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Blended woven or knitted fabrics containing polyerethane elastic fibers and process for the production thereof
  • Blended woven or knitted fabrics containing polyerethane elastic fibers and process for the production thereof
  • Blended woven or knitted fabrics containing polyerethane elastic fibers and process for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0119] The following isocyanate-terminated prepolymer and hydroxy-terminated prepolymer were prepared as the starting materials for the production of polyurethane elastic filaments.

[0120] Synthesis of Hydroxy-Terminated Prepolymer

[0121] A reactor sealed with nitrogen and equipped with a 80° C. warm-water jacket was charged with 25 parts of 4,4′-diphenylmethane diisocyanate (MDI) as the diisocyanate, following which 100 parts of polytetramethylene ether glycol (PTMG) having a number-average molecular weight of 2,000 was added under stirring as the polymer diol. After one hour of reaction, 27.6 parts of 1,4-butanediol was added as the low-molecular-weight diol, thereby forming a hydroxy-terminated prepolymer.

[0122] Synthesis of Isocyanate-Terminated Prepolymer

[0123] A nitrogen-sealed 80° C. reactor was charged with 47.4 parts of MDI as the diisocyanate and 2.2 parts of a mixture composed of an ultraviolet absorber (2-(3,5-di-t-amyl-2-hydroxyphenyl)benzotriazole: 20%), an antioxida...

example 2

[0142] Aside from using polyethylene glycol adipate having a number-average molecular weight of 2,000 instead of PTMG, polyurethane elastic filament made with polyester diol was obtained in the same way as in Example 1. The isocyanate group content of the polyurethane elastic filament immediately after discharge from the spinneret was 0.45 wt %. Measurement of the physical properties carried out as in Example 1 showed that the resulting 44-dtex polyurethane elastic filament had a melting point of 170° C. and 62% retention of tenacity under heating.

[0143] Using the elastic filament, a knitted fabric was produced in the same way as in Example 1. The unraveling tension of the knitted fabric after it had been heat set was measured. The results are shown in Table 1.

example 3

[0149] A knit fabric produced by the method described below using the polyurethane elastic filament obtained in Example 1 was heat set, then subjected to a laundering test, following which the fabric was visually inspected for fraying, slip-in and the surface properties. The results are shown in Table 2.

[0150] Production of Knit Fabric

[0151] A knit fabric having a plated structure was produced by feeding false-twisted Z-twist 33 dtex, 10 filament nylon-6 yarn to yarn feeders 1 and 3, feeding false-twisted S-twist 33 dtex, 10 filament nylon-6 yarn to feeders 2 and 4, and also feeding polyurethane elastic filaments to all four feeders on a pantyhose knitting machine (Lonati, 400 needles). The knit-in ratio was set at 2.5.

[0152] Heat Setting

[0153] The knitted fabric was dry heat treated for 1 minute in a dryer held at 180° C.

[0154] Laundering Test

[0155] Specimens measuring 15×20 cm were cut from the knit fabric after it had been heat set. The specimens were repeatedly washed (20 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

A blended woven or knitted fabric which contains both highly fusible polyurethane elastic fibers exhibiting a retention of tenacity of 50% or above after the dry heat treatment at 150° C. for 45 s at 100% elongation and a melting point of 180° C. or below and at least one kind of non-elastic yarns and which is produced by fusing the polyurethane elasotomeric fibers to each other or the polyurethane elastic fibers to the non-elastic yarns at the crossover points by dry- or wet-heat setting; and a process for the production thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to woven or knit fabrics containing polyurethane elastic filaments in combination with other fibers, and to a process for manufacturing such fabrics. More specifically, the invention relates to polyurethane elastic filament-containing blended woven or knit fabrics, including circular knit (e.g., plain, rib, purl) and other types of weft knit fabrics, warp knit fabrics (e.g., chain, denbigh, cord, atlas), and woven fabrics, which minimize the appearance of fabric defects such as deformation, yarn slippage and grinning from repeated stretching when articles made from such woven or knit fabrics are worn, fraying in which threads are lost from cut edges of the fabric, damage or defects of the type known as laddering or running that arise in the fabric structure, edge curling of the fabric, and the effect sometimes referred to as “slip-in” where just the elastic filaments pull away from a seam in an article that has been cut and sewn, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D03D15/00D04B21/12D03D15/56D04B21/16
CPCD04B21/16D04B1/16Y10T442/313D10B2401/041D04B1/18D04B21/18
Inventor FUKUOKA, KUNIHIRONISHIO, KOUJI
Owner NISSHINBO IND INC
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