STRETCHED YARN PIRN

摘要

A polytrimethylene terephthalate stretched yarn pirn, which comprises, being wound in a winding hardness of 80 to 90, polytrimethylene terephthalate stretched yarns having a limiting viscosity of 0.7 to 1.3 dl/g, a starting temperature for the manifestation of heat shrinkage stress of 55 DEG C or higher, an extremal value temperature for heat shrinkage stress of 150 to 190 DEG C and an elongation at break of 36 to 60 %. The stretched yarn pirn has good unwinding characteristics also in high speed false twisting and is reduced in thread breakage and occurrence of fluff, and thus can be used for producing false-twisted yarns having good quality.