| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a high-strength fiber in good productivity while saving the space and energy. SOLUTION: This method for producing a polyester fiber is characterized in that a polyester undrawn fiber having <1.355 g/cm3 density and >=0.020 birefringenceΔn is irradiated with a laser beam, and subjected to a substantial one-step drawing at >=50 m/min drawing speed to provide the fiber having >=1.360 g/cm3 density, >=0.130Δn, and <=12% shrinkage in boiling water.
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