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.

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：US20190017203A1

公开(公告)日：2019-01-17

申请号：US16033904

申请日：2018-07-12

Applicant: UNITIKA LTD.

Inventor： Hidehito ANDOH ,  Kohei IKEDA

IPC: D04H3/045 ,  B29C65/02 ,  B29C65/00 ,  D04C1/06 ,  D04C1/02 ,  D02G3/36 ,  D02G3/02 ,  D04H3/147 ,  D04H3/007 ,  D04H3/011 ,  D04H3/018 ,  A01K75/00

CPC classification number: D04H3/045 ,  A01K75/00 ,  B29C65/02 ,  B29C66/69 ,  B29C66/71 ,  B29C66/7292 ,  B29D28/00 ,  B29K2023/06 ,  B29K2067/003 ,  B29K2623/06 ,  B29K2667/003 ,  B29L2028/00 ,  D01D5/34 ,  D01F8/06 ,  D01F8/14 ,  D02G3/02 ,  D02G3/36 ,  D02G3/44 ,  D04C1/02 ,  D04C1/06 ,  D04H3/007 ,  D04H3/011 ,  D04H3/018 ,  D04H3/147 ,  D10B2321/021 ,  D10B2331/04 ,  D10B2507/02

Abstract: Provided is a method for manufacturing a fishing net formed from a plastic net that can be handled by winding or folding although the net has plastic rigidity. The fishing net is manufactured by (1) a step of preparing a multifilament yarn formed by bundling a plurality of core-sheath type composite filaments, in each of which a core component is made of polyethylene terephthalate and a sheath component is made of polyolefin, (2) a step of preparing a yarn thread obtained by paralleling a plurality of the multifilament yarns, (3) a step of twisting or braiding four yarn threads 11, 12, 13, 14 to obtain a net constructed with strands 1 and intersections 2, (4) a step of heat-treating the net under without pressure to melt the sheath component of the yarn threads 11, 12, 13, 14 constituting the strands 1 and the intersections 2, followed by solidifying, thus obtaining a plastic net, and (5) a step of forming the fishing net using the plastic net.