VINYLIDENE FLUORIDE-BASED RESIN MONOFILAMENT AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a polyvinylidene fluoride(PVDF) monofilament capable of achieving both of a sufficient knot strength and the improvement in wound curl and improving productivity and a method for producing the same. SOLUTION: This method for producing PVDF-based resin monofilament comprises a drawing process for drawing a melt spun PVDF monofilament and a dry heat relaxation process for relaxing and heat treating the drawn PVDF monofilament in a gas phase of equal to or more than 220 deg.C to less than 300 deg.C temperature under a condition of >=4% to <10% relaxation rate and <=5 seconds of passage time to obtain the PVDF monofilament satisfying the relation expressed by the formula: Y>=d3×2×10-7-d2×2×10-4+d×1.17×10-2+73.11 [wherein d expresses a diameter (μm), Y expresses a knot strength (kgf/mm2)] and has >=24% elongation and >=30% straight line elongation.