公开(公告)号：US20210395926A1

公开(公告)日：2021-12-23

申请号：US17279877

申请日：2019-09-26

Applicant: UNITIKA LTD.

Inventor： Kohei IKEDA ,  Mariko HONDA ,  Yuta MIZUNO ,  Shohei IKEGAMI

IPC: D02G3/04 ,  D01F8/12 ,  D01F8/14 ,  D01D5/10 ,  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.