PROCESS FOR FORMING A CONTINUOUS FILAMENT YARN FROM A MELT SPINNABLE SYNTHETIC POLYMER AND NOVEL POLYESTER YARNS PRODUCED BY THE PROCESS

摘要

ABSTRACTPROCESS FOR FORMING A CONTINUOUS FILAMENT YARN FROM AMELT SPINNABLE SYNTHETIC POLYMER AND NOVEL POLYESTER YARNSPRODUCED BY THE PROCESSA process for forming a continuous filament yarn froma melt-spinnable synthetic linear polymer and novel yarns ofpolyethylene terephthalate and yarns of polyhexamethyleneadipamide produced by the process, the process comprisingextruding the molten polymer through a shaped orifice toform a molten filamentary material, passing the molten filament-ary material through a solidification zone, passing thesolidified filamentary material through a conditioning zoneprovided with a gaseous atmosphere at a temperature above theglass transition temperature of the material and below itsmelting temperature, withdrawing the resulting filamentaryyarn from the conditioning zone and winding up such yarn,characterised in that the gaseous atmosphere in the conditioningzone is compressed steam at an absolute pressure in excessof 136 kN/m2 and preferably, in the case of a yarn of poly-ethylene terephthalate, between 446 and 1176 kN/m2 andpreferably, in the case of a yarn of polyhexamethylene adipamide,between 200 and 580 kN/m2.