POLYESTER FILAMENT PACKAGE

摘要

The present invention provides a polyester filament package which has few defects such as sink marks and has a high fineness, high strength, and excellent dimensional stability. This polyester filament package is a package obtained by winding filaments of a polyester comprising a polyene terephthalate as the main constituent component. In the polyester filament package, the filaments wound on a mandrel having a hardness of 200 kgf/100 mm or greater and an outer diameter of 60 mmφ or larger have a 5% modulus of 2.0 cN/dtex or higher, and the filaments, in an examination for wet-heat shrinkage stress in the longitudinal direction, have a peak cycle of 150 m or less.