B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/33 (2006.01) A45D 34/04 (2006.01) B29C 45/44 (2006.01) B65D 1/02 (2006.01)
Patent
CA 2067016
The present invention provides an injection mold having an injection core mold for defining the inner wall of a lip portion in a preform having an undercut area, a first lip cavity mold for defining the outer wall of the lip portion having no undercut, and a second lip cavity mold for defining the outer wall of the lip portion having the undercut area. In an initial release after the injection molding process for the preform, the second lip cavity mold is first moved upwardly to secure a space wherein there is no obstruction around the outer periphery of the undercut area. Thereafter, the injection core mold is upwardly moved such that the second injection core mold can be forcibly released from the molded preform while resiliently deforming the undercut area in the outward direction, utilizing the space so formed. The barrel portion of the preform so molded is biaxially stretched to provide a so-called roll-on type biaxially oriented vessel having a ball received in the lip portion thereof.
Fetherstonhaugh & Co.
Nissei Asb Machine Co. Ltd.
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