JP2005232668A5 - - Google Patents

Claims (8)

In the method of blending and spinning the thermoplastic resin chips A and B having different specific gravities, the grain weights A ₁ and B ₁ and the major axis / minor axis ratio A ₂ and B ₂ are the following [1], [2], [4] A melt spinning method characterized by satisfying the formula and adding 10 ppm or more of a surfactant to the thermoplastic resin chips A and B.
0.4 ≦ A ₁ / B ₁ ≦ 2.5 [1]
0.5 ≦ A ₂ / B ₂ ≦ 2 [2]
_{A 3 -B 3 <-3,3 <A} 3 -B 3 [4]
However, the unit of repose angles A ₃ and B ₃ is °. In a method in which thermoplastic resin chips A and B having different specific gravities are blended and melt-spun, the particle weights of the thermoplastic resin chips A and B are A ₁ and B ₁ , and the major axis / minor axis ratio is A ₂ , B _2. A melt spinning method using thermoplastic resin chips A and B that satisfy all the following formulas when the angle of repose is A ₃ and B ₃ .
0.4 ≦ A ₁ / B ₁ ≦ 2.5 [1]
0.5 ≦ A ₂ / B ₂ ≦ 2 [2]
−3 ≦ A ₃ −B ₃ ≦ 3 [3]
However, the unit of the grain weights A ₁ and B ₁ is the number of grams per 3000 grains, and the unit of the repose angles A ₃ and B ₃ is °. The major axis / minor axis ratios A ₂ and B ₂ are dimensionless numbers. 3. The melt spinning method according to claim 1, wherein the following formula is satisfied when the compression ratios of the thermoplastic resin chips A and B are A ₄ and B ₄ , respectively:
0.3 ≦ A ₄ / B ₄ ≦ 3 [5] The thermoplastic chips A and B are a combination of a thermoplastic resin chip to which 5 to 50% by weight of additive C is added and a thermoplastic resin chip that does not contain additive C, and the base polymer has the same composition. The melt spinning method according to any one of claims 1 to 3, wherein the melt spinning method is provided. A polyamide fiber containing 1 to 5% by weight of titanium oxide and having a variation in titanium oxide concentration in the yarn length direction of 0.1% by weight or less, having a boiling water shrinkage of 3 to 12%, and a dynamic friction coefficient of yarn-thread A polyhexamethylene adipamide fiber characterized by having an aggregate particle diameter of 0.2 or more and titanium oxide of 1 μm or less. 6. The polyhexamethylene adipa according to claim 5, wherein the polyhexamethylene adipa is produced by a melt spinning method characterized by being taken up at a take-up speed of 3000 to 5000 m / min and applying a water-containing emulsion oil agent between 30 and 300 cm below the solidification point. Mid fiber. The polyhexamethylene adipamide fiber of Claim 5 or 6 manufactured using the manufacturing method in any one of Claims 1-4. A woven or knitted fabric characterized by using the polyhexamethylene adipamide fiber according to any one of claims 5 to 7 and having a light transmittance of 15% or less determined by the following formula.
(Lw−Lb) / (LW−LB) × 100 (%) [6]
Here, LW is the L value of the color standard white board, LB is the L value of the blackboard, Lw is the L value of the woven or knitted fabric when left on the color standard white board, and Lb is the woven or knitted fabric when left on the blackboard. L value is shown.