VINYLIDENE FLUORIDE RESIN MONOFILAMENT AND METHOD FOR PRODUCING THE SAME

摘要

A production method for a PVDF monofilament according to the present invention comprises a drawing step of drawing a melt-spun PVDF monofilament; and a dry thermal relaxation treatment step of subjecting the drawn PVDF monofilament to a relaxation thermal treatment in a gas phase at a temperature between 220 DEG C and 300 DEG C inclusive and under such conditions that the relaxation rate falls between 4% and 10% inclusive and that the passing time is not more than 5 seconds, thereby obtaining the PVDF monofilament satisfying the relation represented by Eq (1) below; Y>/=d<3>x2x10<-7> -d<2>x2x10<-4> +dx1.17x10<-2> +73.11 (where d indicates the diameter ( mu m) and Y the knot strength (kgf/mm<2>)) and having a knot elongation of not less than 24% and a straight elongation of not less than 30 %.