| 摘要 |
PURPOSE:To obtain the titled yarn having high strength and uniformity inexpensively, by subjecting a thermoplastic polyester to melt spinning, cooling the yarn, introducing it into a hot zone, heating and drawing it by a hot gas introduced from the space at the top of a masking shield set around a thread handling area, winding it at high speed. CONSTITUTION:A thermoplastic polyester is subjected to melt spinning from a spinneret, cooled to <=a glass transition temperature once, and the yarn Y is introduced from the heating column 1, etc. to a hot zone. A hot gas with 10- 80Nl/min flow rate is introduced into a place between the gas feed part 3 and a thread handling area along the thread handling area into the hot zone in such a way that the masking shield 5 is set to cover the thread handling area, the introduced gas is made not to come into contact with the yarn directly at the feed part, the hot gas is passed, through the hot gas feed part 3 where the hot gas from the space 6 set at the top of the masking shield 5 is made to come into contact with the yarn, the yarn Y is heated and drawn, and wound at >=3,000 speed, to give the desired yarn.
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