【発明の名称】直接ゲート射出成形装置及び成形方法

Japanese Patent JPH0710543

B2

The present invention relates to a process and apparatus for injection molding thin-walled plastic articles. In a first embodiment, the apparatus comprises a mold cavity (14) and a mold core (18) defining a cavity space (19) in the shape of the article and at least two injection gates (32) adjacent a portion of the cavity space defining the lip portion (30) through which molded plastic is injected into the cavity space (19). This direct lip gating approach does not sacrifice core/cavity alignment and conventional mold motions along the machine axis and forms plastic articles having substantially no gate vestiges on the lip sealing surface or on the outer perimeter of the lip. In a second embodiment, the apparatus includes a mold cavity (14) and a mold core (18) defining a cavity space (19) in the shape of the article. The cavity space has a circumferentially extending region (126) having a thickness greater than the thickness of a sidewall defining portion (122). This circumferentially extending region (126) is preferably located at the approximate mid-point of the sidewall defining portion (122). At least two gates (32) directly and simultaneously introduce plastic material initially into the circumferentially extending portion (126) in a manner so as to minimize the creation of side loads and core shift. After the circumferentially extending region (126) is filled, the plastic material fills the entire cavity space. The plastic material is thereafter cooled to form the desired article.

Robert Di. Shad

JP23309290A

February 08, 1995

September 03, 1990

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Husky Injection Molding Systems Limited

B29C45/00; B29C45/26; B29C45/27; B29C45/36; B29C45/43; B29D22/00; B29L22/00; (IPC1-7): B29C45/26; B29D22/00

JP57188329A
JP5166170U

Fujiya Shiga (1 person outside)

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