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公开(公告)号:US12264420B2
公开(公告)日:2025-04-01
申请号:US17279877
申请日:2019-09-26
Applicant: UNITIKA LTD.
Inventor: Kohei Ikeda , Mariko Honda , Yuta Mizuno , Shohei Ikegami
IPC: D04H1/541 , B29C65/00 , B29C65/02 , D01D5/10 , D01F8/12 , D01F8/14 , D02G3/04 , D04B1/16 , D04H3/045
Abstract: Provided is a thermal molding method for producing a thermally molded article having excellent abrasion resistance at its melt-fused part. Polyamide 6 and a copolyester are prepared separately. The copolyester contains terephthalic acid, ethylene glycol, and 1,4-butanediol as copolymerization units. The copolyester may further contain ε-caprolactone and/or diethylene glycol as a copolymerization unit. A multifilament yarn in which core-sheath type composite filaments each containing a core component and a sheath component at a ratio of 1 to 4:1 by mass are bundled is produced by a composite melt-spinning method using the polyamide 6 as the core component and the copolyester as the sheath component. Using the multifilament yarn, a product of filaments is produced by weaving, knitting, knitting and braiding, or braiding. The product of filaments is heated to melt the copolyester and fuse the core-sheath type composite filaments to each other while retaining the initial filament form of the polyamide 6, thus thermally molding the product of filaments.