GB1030570A - Fiber blends and yarns spun therefrom - Google Patents

Abstract

Yarn is spun by the cotton system from a blend of 50-82% of cotton fibre and a "nylon" (i.e. polycarbomides such as polyhexamethylene adipamide or polycaproamide) staple mixture composed of 50-90% uncrimped fibre (having a load-bearing capacity of at least 2.1 g.p.d. at 7% elongation and a boil-off shrinkage of not more than 6%-measured after nine days slack ageing) and 50-10% crimped "carrier" fibres having a crimp index of at least 8%. The two forms of nylon fibre may be identical e.g. to present the same dyeing effects, or different as regards chemical composition, denier, staple length, and/or filament cross-section. The carrier fibres may be prepared, during or subsequent to hot-drawing, by stuffer-box, gear, edge, twist or false-twist, or (turbulent) fluid jet crimping combined with heat-setting. The crimped and uncrimped fibre mix may be prepared by stapling combined tows of continuous filaments thereof, or by blending separately prepared and stapled fibres, and the blended slivers are picked and carded (without the occurrence of excessive mechanical loading usually associated with carding crimped nylon fibre). The carded sliver is blended with cotton sliver on a draw frame prior to normal spinning. Conventional additives and finishes e.g. delustrants, dye modifiers, antistatic agents, antioxidants, heat stabilizers, may be incorporated in the fibres. The final yarn is stated to be stronger than a 100% cotton yarn of equivalent count. The tensile strength of a carded web of the mixed fibre is assessed in terms of card sliver cohesion. The sliver is passed through two sets of two rollers each and between which a speed differential exists so that a small draft occurs. The downstream rollers are flexibly mounted and movement thereof, in response to sliver cohesion variation, sends an electrical signal to an appropriately calibrated recorder through a transducer circuit.