US 12,290,970 B2
Apparatus for producing resin molded article, method for producing resin molded article, and resin molded article
Ryo Kawamura, Nagano (JP); and Masayuki Usami, Nagano (JP)
Assigned to NISSEI ASB MACHINE CO., LTD., Nagano (JP)
Appl. No. 17/620,991
Filed by NISSEI ASB MACHINE CO., LTD., Nagano (JP)
PCT Filed Jun. 26, 2020, PCT No. PCT/JP2020/025173
§ 371(c)(1), (2) Date Mar. 30, 2022,
PCT Pub. No. WO2020/262595, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-121680 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0355519 A1, Nov. 10, 2022
Int. Cl. B29C 45/16 (2006.01); B29C 45/14 (2006.01); B29C 49/00 (2006.01); B29L 9/00 (2006.01)
CPC B29C 45/1671 (2013.01) [B29C 45/14598 (2013.01); B29C 49/071 (2022.05); B29C 2045/1693 (2013.01); B29L 2009/001 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A production apparatus of a two-layer preform including an inner layer preform and an outer layer preform, the apparatus comprising:
a first injection molding unit configured to injection-mold the inner layer preform with a first resin material;
a second injection molding unit configured to internally accommodate the inner layer preform that is injection molded in the first injection molding unit and injection-mold the outer layer preform on the outside of the inner layer preform with a second resin material having a lower melting point than the first resin material, and
a neck mold that molds a neck portion of the preform,
wherein
the first injection molding unit has a first injection core mold applied to injection molding of the inner layer preform,
the second injection molding unit has a second injection core mold applied to injection molding of the inner layer preform and is different from the first injection core mold, and
an outer layer cavity mold for injection-molding the outer layer preform,
a bottom surface of the outer layer cavity mold is provided with a protrusion for separating the inner layer preform disposed in the outer layer cavity mold from the bottom surface, and
the inner layer preform is supported by the neck mold and conveyed to the second injection molding unit.