Helically Crimped Filamentary Materials

摘要: 1,179,436. Composite filaments. IMPERIAL CHEMICAL INDUSTRIES Ltd. 13 May, 1968 [22 1967], No. 23671/67. Heading B5B. [Also in Division D1] A composite filament possessing reversing helical crimp, characterized by a crimp index the range 40% to 70% and 8 25 crimps per inch, comprises two synthetic polymers so distributed that it has along its length cross-section made up of distinct components arranged eccentrically, each component consisting one said polymers, being polyethylene terephthalates having different intrinsic viscosities values birefringence which differ an amount whereby factor #IV. #BR. lies 1A9 x 10 -4 3A3 -3 , where #IV is difference #BR components. Preferably, either 2A9 4A5 I or 1A4 2A1 . Such filaments may be into filamentary non-woven structure, specific volume when uncompressed at least 80 c.c.s. gram compressed under load grams centimeter 30 gram. The side-by-side structure sheathcore proportions terephthalate vary between 80: 20 20: 80, but preferably are substantially equal. For optimum performance filament, for example 4 denier as filling stuffing material preferred average number inch 13A5 Œ 2A5. Filaments 2A5 prepared from as-spun s about 9 -5 #BR, filaments, drawing tow continuous bicomponent steam, relaxing releasing tension on develop " spontaneous enhancing heat treating relaxed potential crimp. 2 4A3 6A6 using crimping method Specification 1,172,011, while contains 10% weight liquid wetting agent In Example 1, chips differing melt-spinning, relationship equal proportions. After wind-up comprising 16,000 spun passed through bath water containing 2A0% textile finishing then feed/ draw rolls system drawn ratio 3A9 times. treatment remove excess agent, air ejector, outlet connected flexible tube, conveyed brattice setting oven. Relaxation occurred within tube was reduced developed simultaneously As fully deposited observed had split several sub-tows, many crimped together register. set oven 135‹ C. ten minutes cut 2-inch staple fibres give with 58% 15. 2, viscosities, polymer melt-spun 12,600 3A33 times original length. treated previous 145‹ minutes, sprayed 44% 14.