Method for producing polypropylene resin article having skin mat

Details Method for producing polypropylene resin article having skin mat Method for producing polypropylene resin article having skin mat

1991-10-11

1994-01-25

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 54, 2643287, B29C 6722

Patent

active

052813762

ABSTRACT:
A multi-layer molded article which is made of a polypropylene resin body and a skin material lined with a foamed layer and has good appearance is produced by using molds between which a cavity clearance is freely set, placing a skin material lined with a foamed layer between the upper and lower molds and supplying a molten polypropylene resin containing a chemical blowing agent through a resin melt conduit in the lower mold when cavity clearance (t) is between (C+15) mm and (C+50) mm where "C" is a thickness of the skin material lined with the foamed layer, lowering the upper mold at a specific rate and pressing the molten resin at specific pressure to fill cavity ends with the molten resin to complete molding of a body of the resin, pressing the body for a certain time after completing molding to form a skin layer, lifting up the upper mold to decrease a compression pressure of the skin material lined with the foamed layer to a pressure lower than a blowing pressure of the polypropylene resin to form and solidify a foamed body, and again lowering the upper mold to apply a certain pressure on a molded article and cooling the article in the molds.

REFERENCES:
patent: 3793415 (1974-02-01), Smith
patent: 4035458 (1977-07-01), Lyman
patent: 4783292 (1988-11-01), Rogers
patent: 4976414 (1990-12-01), Yanagishita
patent: 5034076 (1991-07-01), Masui et al.
patent: 5116556 (1992-05-01), Danton

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