LENGTHWISE AND CROSSWISE STRETCHABLE CLOTH AND PROCESS FOR ITS PRODUCTION

摘要

Lengthwise and crosswise stretchable cloth contains at least 30 wt.% of conjugate polyester fibres. The conjugate polymer fibres are obtained by the bicomponent spinning of (A) polyethylene terephthalate and (B) either polyethylene terephthalate or polybutylene terephthalate followed by stretching the obtained fibres. It is specified that (A) is obtained by copolymerising 1.5 to 6.0 mol.% of a comonomer unit which has a metal sulphonate group. The conjugate fibres have a double refraction ratio of 90 x 10 power-3 to 195 x 10 power-3 and an elongation when three dimensionally crimped falling within the range in the lengthwise and crosswise directions: ((L2-L1)/L1)x100 = 9-160 where L1 represents the vertical length of a 5 cm wide test sample with a given length when a 5g-load is imposed on it; L2 represents the vertical length of the sample when a given load, 240 g in the case of non-woven fabric or 1500 g in the case of woven or knitted fabric, is imposed on it. The three dimensional crimping is carried out by irradiation with ultra-violet light. The basic cloth is made of conjugate fibres which have a crimping number of 8-13 per inch when measured by mechanically crimping or of 30-50 per inch when measured by IR light irradiation. The basic cloth can contain 5-35 wt.% of low-melting point fibres. The basic cloth is heat-treated at 70 deg.C or less after having been formed into a short-loop.