Manufacturing method of synthetic resin hollow body
AssigneeDu Pont-Mitsui Polychemicals Co., Ltd.
InventorsSadaki YAMAMOTO, Kazuyuki Oogi, Masanobu Sato
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Abstract
A manufacturing method of a synthetic resin hollow body in which a molten resin is injected for an over-molding outside a hollow molding body made of a resin provided with a hollow body and at least an opening portion to form a resin sheathing body in an integrating manner with the hollow molding body. The method includes the step of injecting the molten resin for an over-molding under the state in which the hollow molding body is partially or wholly filled with a fluid substance. The manufacturing method of a synthetic resin hollow body is capable of suppressing resin cost and operation cost and can improve decorating property.
Claims10
A manufacturing method of a synthetic resin hollow body (A) in which a molten resin is injected for an over-molding outside a hollow molding body (a) which is made of a resin, is hollow inside and is provided with at least an opening portion to form a resin sheathing body in an integrating manner with the hollow molding body (a), which method comprising the steps of:
- filling partially the hollow molding body (a) with a liquid as a fluid substance, the rest of the hollow molding body (a) filled with air, or filling wholly the hollow molding body (a) with a liquid as a fluid substance,
- attaching a cap member to the opening portion,
- setting the hollow molding body (a) holding the liquid inside to a metal mold, and
- injecting the molten resin into the metal mold for an over-molding wherein the liquid is one of water, an aqueous solution, a cosmetic solution, a chemical, and an organic solvent,
- whereby the resin sheathing body is formed to cover the entire of the hollow molding body (a) from the bottom end of the opening portion.
Dependencies are inferred from the claim text.