公开(公告)号：US11931936B2

公开(公告)日：2024-03-19

申请号：US17901927

申请日：2022-09-02

Applicant: DENSO CORPORATION

Inventor： Tohru Higuchi ,  Masato Ichikawa ,  Tsuyoshi Arai ,  Jun Hasebe ,  Atsushi Kawamura ,  Tomoyoshi Murata

IPC: B29C45/27 ,  B29C45/16

CPC classification number: B29C45/2701 ,  B29C45/16

Abstract: In an injection process, molten resin is successively injected from a first flow channel and a second flow channel connected with each other in order into a cavity of a metal mold. High-temperature resin existing in the first flow channel is injected in advance into the cavity as a part of a single shot of molten resin to later form a skin layer of a molded article. Other low temperature resin near a flowable limit existing in the second flow channel is subsequently injected into the cavity as another part of the single shot of molten resin to later form a core layer of the molded article. A low temperature resin remaining in the first flow channel when injection is completed is warmed to be a high-temperature resin before the next cycle, thereby allowing successive molding of molded articles.