B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 5/18 (2006.01) B29C 43/20 (2006.01) B29C 44/14 (2006.01)
Patent
CA 2053194
The present invention provides a multi-layer molded article which is made of a polypropylene resin body and a skin material lined with a foamed layer. The article has a good appearance and is produced using upper and lower molds which have a cavity therebetween. A specific cavity clearance is freely set between the molds, a skin material lined with a foamed layer is placed between the upper and lower molds, and a molten polypropylene resin containing a chemical blowing agent is supplied through a resin melt conduit into the lower mold when the 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 the cavity 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 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.
Hara Takahisa
Matsumoto Masahito
Matubara Shigeyoshi
Usui Nobuhiro
Hara Takahisa
Kirby Eades Gale Baker
Matsumoto Masahito
Matubara Shigeyoshi
Sumitomo Chemical Co. Ltd.
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