| 摘要 |
[PROBLEMS] To provide a method for producing a polyester fiber exhibiting the strength and the dimensional stability required for the application as a rubber reinforcing material, with improved productivity. [MEANS FOR SOLVING PROBLEMS] A method of melt- spinning a polyester fiber having an intrinsic viscosity of 0.85 dl/g or more, wherein the total number of holes (11) per a spinning mouth piece (10) is 250 or more and the number of holes (11) per the area of the spinning mouth piece is 1.5 /cm2 or more, the portion (12) of the hole (11) for the discharge from the inside has a hole diameter (D) of 0.5 mm or more, and the ratio (L/D) of the hole length (L) of the portion (12) of the hole for the discharge to the hole diameter (D) is 3. 0 or less.
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