| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of a melt spinning method of extra fine polyamide fiber and to obtain a product having excellent spinning operation stability and high qualities at a low cost. SOLUTION: The method for producing an extra fine polyamide fiber having≤1.0 dtex single filament fineness and≥50 single filament count comprises extruding a polymer from a spinneret having annularly arranged discharge openings to form a yarn, cooling and solidifying the yarn by cold air blown out from a cooler which is arranged in the downstream of the spinneret and sprays cold air in the whole directions of the inner periphery or the outer periphery of yarn, bundling the yarn by a pair of oil supply guides facing each other with the yarn between, interlacing the yarn and winding the yarn on a winder at a high speed of≥3,500 m/min. COPYRIGHT: (C)2007,JPO&INPIT
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