| 摘要 |
[Problems] To provide a polyester monofilament having excellent dimensional stability, the effect of inhibiting filament scraping, the effect of preventing pirn contraction and the effect of preventing halation, which have not been obtained for the conventional monofilaments, and having such fine fineness that the production of a high mesh is possible, high strength and high modulus. [Means for Resolution] A (dope-dyed) sheath-core type composite polyester monofilament in which 80 mol% or more of a structural unit is polyethylene terephthalate, wherein the following A to F are satisfied:
A. A polyester of a core component has an intrinsic viscosity of 0.70 dL/g or more, and a polyester of a sheath component has an intrinsic viscosity of 0.55 to 0.60 dL/g;
B. The weight ratio of the core component is from 50% to 70%;
C. Fine metal particles are contained in polyethylene terephthalate constituting at least a sheath component in an amount of 0.2 to 0.4% by weight;
D. When the monofilament has a fineness of 5 to 15 dtex, the modulus at an elongation of 5% is from 3 to 4.5 cN/dtex, and the breaking elongation is from 20 to 40%;
E. The degree of free shrinkage of the monofilament in a most inner layer portion of a taken-up package measured 10 days after winding up is 0.3% or less; and
F. The number of slub portions per 100,000 meters in a filament longitudinal direction, which are 10 µm or more thicker than a filament diameter, is 1 or less. |
