| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a system for producing extrafine synthetic multifilament without declining in productivity and quality by installing a melt spinning machine with a spinneret having a specific nozzle specification and nozzles with a specific arrangement in consideration of the direction of melt-spun filament-cooling airflow. SOLUTION: The method for producing extrafine synthetic fiber≤0.9 dtex in single filament fineness in the form of polyester multifilament yarn made from a polyester that is obtained by copolymerization between a metal 5-sulfoisophthalate and polyethylene glycol is provided, wherein this method is characterized by involving using a specific spinneret with nozzle arrangement, etc. specified and making a cooling airflow blowing treatment under the spinneret under specific conditions. COPYRIGHT: (C)2007,JPO&INPIT
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