| abstract |
(57) [Summary] [Purpose] To provide a composite sewing thread which is excellent in high-speed sewability and has good seam strength and seam appearance. [Structure] Long fiber filament having a breaking strength of 7.5 g / d or more, 150 ° C. dry heat shrinkage of 4% or less, and a stress at 5% extension of 2.0 g / d or more is used as a core fiber, and a short fiber is used. The envelope is compounded around this. |