Importance

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Abstract

The invention discloses a method for injection molding a composite parison comprising the following first and second steps: a first step wherein neck molds mounted on a transport plate and a mold for a parison neck or an outer layer of the neck are brought together at a first molding station and molten resin is injected into a cavity formed in the neck mold to mold the outer layer of the neck of the parison, and a second step wherein said outer layer of the neck together with the neck molds are transported to a second molding station, the neck molds, the mold for the main parison portion and core molds are brought together at said second molding station while holding the outer layer of the neck to form continuous cavities extending over the inside of the outer layer of the neck, and molten resin different from the first mentioned molten resin is injected into said cavity to mold the main parison and at the same time mold an inner layer of a neck which is integral with said main parison portion and deposited with the outer layer of the neck to form a composite.

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First Claim