| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for stably producing a polyester multifilament yarn having≥20% percentage of hollowness. SOLUTION: Melt spinning of the polyester is carried out to produce the polyester hollow yarn having≥20% percentage of hollowness and≥20 number of filaments by the melt spinning. In the process, the molten polymer is extruded at an extrusion linear velocity within the range of 5-12 cm/s by using a spinneret having extrusion holes composed of a plurality of slits and spinning and take-off are carried out at a spinning draft ratio within the range of 400-1,000. Furthermore, there is provided a constant-temperature region in which the atmospheric temperature at a distance within the range of 0-40 mm from the polymer extrusion surface of the spinneret is uniformly kept at a higher temperature than the glass transition temperature of the polyester by 75-160°C. COPYRIGHT: (C)2007,JPO&INPIT
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