US 12,454,091 B2
Method and apparatus for producing resin container
Yoichi Tsuchiya, Nagano (JP); and Kazuya Ishizaka, Nagano (JP)
Assigned to NISSEI ASB MACHINE CO., LTD., Nagano (JP)
Appl. No. 18/025,984
Filed by NISSEI ASB MACHINE CO., LTD., Nagano (JP)
PCT Filed Sep. 15, 2021, PCT No. PCT/JP2021/033866
§ 371(c)(1), (2) Date Mar. 13, 2023,
PCT Pub. No. WO2022/059695, PCT Pub. Date Mar. 24, 2022.
Claims priority of application No. 2020-155082 (JP), filed on Sep. 16, 2020.
Prior Publication US 2023/0347570 A1, Nov. 2, 2023
Int. Cl. B29C 49/22 (2006.01); B29C 49/06 (2006.01); B29C 49/64 (2006.01)
CPC B29C 49/22 (2013.01) [B29C 49/06 (2013.01); B29C 49/6445 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of producing a resin container, the method comprising:
injection-molding a resin intermediate molded body of bottomed cylindrical shape as a first injection-molding;
injection-molding a resin material on an outer side of the intermediate molded body as a second injection molding, to produce a multilayer preform in which a resin layer is layered on an outer peripheral side of the intermediate molded body;
blow-molding the preform in a state of containing residual heat from injection-molding to produce a resin container having a bottom portion thicker in wall thickness than a body portion, wherein
a portion of an inner peripheral side of the intermediate molded body, the portion reaching a bottom portion of the intermediate molded body, has a tapered region in which a wall thickness increases toward the bottom portion; and
the wall thickness of the bottom portion of an outer layer in the multilayer preform is set to be thicker than the wall thickness of the bottom portion of an inner layer excluding the tapered region.