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.

公开(公告)号：US20210054537A1

公开(公告)日：2021-02-25

申请号：US16981592

申请日：2019-03-14

Applicant: UNITIKA LTD.

Inventor： Kohei IKEDA ,  Mariko HONDA

IPC: D01F8/14 ,  D01F8/06 ,  D01D5/08 ,  D01D5/34 ,  B32B5/02 ,  B32B5/08

Abstract: To provide a thermoforming method for obtaining a thermoformed article that exhibits excellent abrasion resistance at melt-bonded portions, and excellent adhesive strength between woven fabrics or to another kind of article. Polyethylene having a melt flow rate, measured under conditions of a temperature of 280° C. and a load of 2.16 kg, of 10 to 15 g/10 min and polyethylene terephthalate are prepared. By a conjugate melt spinning method using the polyethylene terephthalate as a core component and the polyethylene as a sheath component, multi-filament yarn in which core-sheath composite filaments having a core component:sheath component mass ratio of 1 to 4:1 are bundled is obtained. A product of filaments is obtained by weaving, knitting, braiding or winding using the multi-filament yarn. Thermoforming of the product of filaments is carried out by heating the product of filaments to melt the polyethylene, thereby melt-bonding the core-sheath composite filaments to each other, with the polyethylene terephthalate retaining its initial filament form.