APPARATUS AND METHOD OF PRODUCING FILAMENT YARN

PROBLEM TO BE SOLVED: To provide an apparatus and a method of producing a filament yarn capable of making the filament yarn made of a thermoplastic polymer which is multi-filament of single yarn fineness excellent in quality including uniformity such as yarn thickness unevenness or quality unevenness, strength, elongation or the like. SOLUTION: The method of producing filament yarns is characterized in that a filament yarn is spun out from a spinneret having a plurality of dispensing holes annularly arranged to seal the spinneret by blowing a sealing air stream from a sealing air stream blowing means having an annular sealing air stream blowing surface provided, and to blow an air stream at a lower temperature than the sealing air stream from an inner blowing annular cooling means having an annular air stream blowing surface provided on the downstream in a running path direction of the filament yarn from the sealing air stream blowing means, so as to cool the filament yarn; and in that a position with the maximum atmospheric temperature gradient in the running path direction of the filament yarn in a region inward of the running path of the filament yarn is between the upper end on the upstream in the running path direction of the filament yarn on the air stream blowing surface of the annular cooling means and the spinneret. COPYRIGHT: (C)2011,JPO&INPIT