US 12,264,420 B2
Method for thermal molding of filament product
Kohei Ikeda, Uji (JP); Mariko Honda, Uji (JP); Yuta Mizuno, Okazaki (JP); and Shohei Ikegami, Okazaki (JP)
Assigned to UNITIKA LTD., Amagasaki (JP)
Appl. No. 17/279,877
Filed by UNITIKA LTD., Amagasaki (JP)
PCT Filed Sep. 26, 2019, PCT No. PCT/JP2019/037850
§ 371(c)(1), (2) Date Mar. 25, 2021,
PCT Pub. No. WO2020/067285, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-186181 (JP), filed on Sep. 29, 2018.
Prior Publication US 2021/0395926 A1, Dec. 23, 2021
Int. Cl. D04H 1/541 (2012.01); B29C 65/00 (2006.01); B29C 65/02 (2006.01); D01D 5/10 (2006.01); D01F 8/12 (2006.01); D01F 8/14 (2006.01); D02G 3/04 (2006.01); D04B 1/16 (2006.01); D04H 3/045 (2012.01)
CPC D02G 3/045 (2013.01) [B29C 65/02 (2013.01); B29C 66/05 (2013.01); B29C 66/69 (2013.01); B29C 66/712 (2013.01); D01D 5/10 (2013.01); D01F 8/12 (2013.01); D01F 8/14 (2013.01); D04B 1/16 (2013.01); D04H 1/5412 (2020.05); D04H 3/045 (2013.01); D10B 2331/02 (2013.01); D10B 2331/041 (2013.01); D10B 2507/02 (2013.01)] 7 Claims
 
1. A method of producing a heat molded knotless net, the method comprising:
a step of producing multifilament yarns by bundling core-sheath type composite filaments, wherein the core-sheath type composite filaments are obtained by a composite melt-spinning method, using a copolyester containing terephthalic acid, ethylene glycol, and 1,4-butanediol as copolymerization units for the sheath component of the composite filaments, and using polyamide 6 for the core component of the composite filaments, and wherein the core-sheath type composite filaments have a mass ratio of core component:sheath component being 1 to 4:1;
a step of braiding 4 or 8 of the multifilament yarns to form a knotless net having braided strands and intersections of the multifilament yarns forming the knotless net; and
a step of heating the knotless net to melt the copolyester and fuse the core-sheath type composite filaments to each other while the core component of polyamide 6 of the composite filaments maintains an initial form that is a form prior to the step of heating the knotless net to melt the copolyester.