Process for producing multilayer molded article
AssigneeSumitomo Chemical Company, Limited
InventorsTakahisa Hara, Masahito Matsumoto, Nobuhiro Usui, Sigeyoshi Mathubara
Life of this patent
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Abstract
A multilayer molded article having a core layer and a skin material laminated on the core layer is produced by providing a skin material between a pair of upper and lower molds, supplying a thermoplastic resin melt between the skin material and one of the molds, closing the molds to press and form the resin melt while holding edges of the skin material with pins provided on a skin material-fixing frame which moves along an outer peripheral wall of one of the upper and lower molds, and cooling the molds and removing the multilayer molded article from the molds.
Claims6
A process for producing a multilayer molded article comprising a core layer and a skin material laminated thereon, which process comprises the steps of:
- mounting a skin material between a pair of upper and lower molds by fixing an edge portion of said skin material to a plurality of prepositioned pins provided on a skin material fixing frame;
- supplying a thermoplastic resin melt between said skin material and one of said molds;
- closing the molds to press and form said resin melt while simultaneously moving said skin material fixing frame along an outer peripheral wall of one of said upper and lower molds, to thereby hold the edge portion of said skin material such that said edge portion of said skin material is locally cut at one or more of said pins according to a shape of the molded article and a tension at any one of said pins during said step of closing;
- and
- cooling said molds and removing said multilayer molded article from the molds.
In a process for producing a multilayered molded article which includes the steps of mounting a skin material between upper and lower molds by fixing an edge portion thereof to holding pins, supplying thermoplastic resin melt between said skin material and one of said molds, and closing the molds so as to form a laminated molded article, the improvement which comprises:
- controlling the tension of said skin material during said mold closing step by preselecting the location and diameter of the holding pins such that said edge portion is controllably, locally cut by at least one of said pins, thereby appropriately controlling the tension of the skin material and reducing the occurrence of skin wrinkling and breakage in the molded article;
- wherein said molded article does not contain the edge portion of the skin material.
Dependencies are inferred from the claim text.