Molded article and method for producing the same

Details Molded article and method for producing the same Molded article and method for producing the same

1997-10-28

1999-10-26

Zirker, Daniel

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283188, 428159, 428158, 428 71, B32B 520, B32B 312, B29C 4400

Patent

active

059724919

ABSTRACT:
An object is to provide a thermoplastic resin molded article concurrently having excellent heat insulating properties, rigidity, and lightness, and to provide a method for producing the same. A molded article made from a thermoplastic molding material comprises: a multilayer structure portion having a surface layer composed of a non-foamed type of said molding material and an internal layer composed of a foamed type of said molding material; and a portion composed of only a non-foamed type of said molding material. The molded article is produced by injecting and filling an expandable thermoplastic molding material which is melted in the heating cylinder that is adjusted to have the temperature of its tip part higher than that of its rear part, into a cavity having a 10 to 95% volume of the volume of the molded article, conducting a first cooling until the molding material becomes the condition that the surface layer contacted with the metal mold is solidified but the internal layer is melted, enlarging the volume of the cavity to the volume of the molded article to foam at least a part of the internal layer, and conducting a second cooling to take out the molded article.

REFERENCES:
patent: 3721197 (1973-03-01), Hughes et al.
patent: 3793415 (1974-02-01), Smith
patent: 4370373 (1983-01-01), Janicz
patent: 5100716 (1992-03-01), Juneau
patent: 5160772 (1992-11-01), Futami et al.
patent: 5478627 (1995-12-01), Hara et al.
patent: 5658652 (1997-08-01), Sellergren
JP 57066798A Abstract (Apr. 1982).

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