US 12,240,156 B2
Injection molding device and method for injection molding
Inki Min, Daejeon (KR); and Cheol Hwan Hwang, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/426,552
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Feb. 13, 2020, PCT No. PCT/KR2020/002045
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/197092, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 10-2019-0034619 (KR), filed on Mar. 26, 2019.
Prior Publication US 2022/0105694 A1, Apr. 7, 2022
Int. Cl. B29C 45/07 (2006.01); B29C 33/42 (2006.01); B29C 35/02 (2006.01); B29C 45/04 (2006.01); B29C 45/26 (2006.01); B29C 45/73 (2006.01); B29C 71/02 (2006.01); B29D 11/00 (2006.01); B29C 35/04 (2006.01); B29C 35/08 (2006.01); B29C 45/16 (2006.01); B29L 11/00 (2006.01)
CPC B29C 45/076 (2013.01) [B29C 33/42 (2013.01); B29C 33/424 (2013.01); B29C 35/02 (2013.01); B29C 45/0441 (2013.01); B29C 45/07 (2013.01); B29C 45/26 (2013.01); B29C 45/2602 (2013.01); B29C 45/2681 (2013.01); B29C 45/73 (2013.01); B29C 71/02 (2013.01); B29D 11/0048 (2013.01); B29C 2035/0211 (2013.01); B29C 35/049 (2013.01); B29C 2035/0811 (2013.01); B29C 45/045 (2013.01); B29C 45/1628 (2013.01); B29C 2045/7356 (2013.01); B29C 2071/022 (2013.01); B29L 2011/00 (2013.01); B29L 2011/0016 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for injection molding a resin comprising the steps of:
injecting a raw resin material into a first cavity of a first movable mold facing a first mold and molding the material to produce a primary molded product;
moving the position of the first movable mold so that a surface of the primary molded product contacts a second mold, without the primary molded product being taken out of the first cavity;
heating the second mold to anneal the primary molded product at a temperature equal to or greater than a glass transition temperature of the resin, then cooling; and
injecting a raw material into a second cavity of a second movable mold facing the first mold and molding the material to produce a secondary molded product,
wherein an embossed or intaglio pattern is formed on a surface of the second moveable mold, and wherein annealing the primary molded product includes simultaneously forming a pattern corresponding to the embossed or intaglio pattern on a surface of the primary molded product.