Integrated spin-draw-texturizing process for manufacture of texturized polyamide filaments

摘要

Integrated process for continuous spinning, drawing and texturizing of synthetic linear high molecular weight polyamide polymers, in which the following steps are effected in immediate succession: PP(A) MELT-SPINNING FILAMENTS OF SAID SYNTHETIC LINEAR HIGH POLYAMIDE POLYMERS, PREFERABLY POLY-&egr;-CAPROLACTAM, AT TEMPERATURES OF BETWEEN 260. degree. AND 295° C and a spin-draw ratio of between 1:10 and 1:60, PP(B) DRAWING THE SPUN FILAMENTS ON AT LEAST TWO FORWARDING ELEMENTS, OF WHICH THE INITIAL ELEMENT HAS A SURFACE TEMPERATURE OF BETWEEN 50° AND 120° C and the final element has a surface temperature of between 80° and 350° C, at a draw ratio such that the drawn filament, on leaving the drawing stage, has an extensibility of between 10 and 50% and preferably of between 20 and 35%, andPP(C) TEXTURIZING SAID FILAMENTS AT A VELOCITY OF BETWEEN 800 AND 3,000 M/MIN BY AN AIR JET PROCESS AND PREFERABLY BETWEEN 1,600 AND 2,000 M/MIN, THE OVERFEED IN THE TEXTURIZING STAGE BEING FROM 10 TO 50% AT A FILAMENT TEMPERATURE, PRIOR TO TEXTURIZATION, OF BETWEEN 50° AND 180° C and preferably of between 100° to 130° C.