Method of manufacturing plastic moldings using a water soluble core
AssigneeTaisei Plas Co., Ltd.
InventorMasanori Naritomi
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Abstract
The present invention relates to a process for producing a plastic molded article (1) having at least partly a hollow portion, and molding is conducted using a core (2) composed of a water-soluble molded article which has been formed to have the shape of the hollow portion. A plastic material is injected to cover part of the surface of the core (2), and subsequently injected to cover the remainder of the surface of the core (2), followed by finally removing the core (2) with water.
Claims3
A process for producing a plastic molded article having at least partly a hollow portion by using a core composed of a water-soluble molded article which has been formed to have a shape of the hollow portion, comprising:
- a step of holding said core by a first mold and forming a first cavity between a second mold and said core,
- a step of injecting a plastic material into the first cavity, wherein part of a surface of said core is covered therewith,
- a step of replacing said first mold with a third mold and forming a second cavity between said third mold and said core,
- a step of injecting a plastic material into the second cavity, wherein a remainder of a surface of said core is covered therewith, and
- a step of removing said core with water.
A process for producing a plastic molded article having at least partly a hollow portion by using a core composed of a water-soluble molded article which has been formed to have a shape of the hollow portion, comprising
- a step of forming a first cavity between a first mold and second mold,
- a step of injecting a plastic material into the first cavity and molding an intermediate molded article which is to cover part of a surface of said core,
- a step of mounting said core on said intermediate molded article,
- a step of forming a second cavity between said core and a third mold,
- a step of injecting a plastic material into the second cavity, wherein a remainder of a surface of said core having been mounted on said intermediate molded article is covered therewith, and
- a step of removing said core with water.
Dependencies are inferred from the claim text.