Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1994-11-08
1997-04-08
Simmons, David A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 466, 264276, 264277, B29C 4406, B29C 4412
Patent
active
056184778
ABSTRACT:
A method for producing a plastic molding having a core and a foam with a skin on an outer surface of the core wherein a foaming material is foamed in a space defined between a skin member and the core, disposed within a molding die assembly having an upper die and a lower die includes disposing the skin member which is provided with edge portions that are bent backward to define side portions and engaging recesses provided on the side portions or in the vicinity thereof, on the lower die of the molding die assembly that is provided with engaging projections corresponding to the engaging recesses of the skin member, so that the engaging projections of the lower die are fitted in the corresponding engaging recesses of the skin member to position and hold the latter; disposing the core which is provided with side walls which define a foaming material receiving portion on the die surface of the upper surface of the die assembly, so that the skin member is fitted in the foaming material receiving portion; and pouring and foaming the foaming material in a cavity defined by and between the core and the skin member, so that the side portions of the skin member can be pressed against the side walls of the foaming material receiving portion of the core by the foaming pressure generated and increased by foaming (continuing reaction) of the foaming material so as to seal the connection between the core and the skin member thereby to produce a predetermined shape of a plastic molding. The disclosure is also directed to a molding die apparatus for producing such a plastic molding.
REFERENCES:
patent: 4793784 (1988-12-01), Belleville et al.
patent: 5006288 (1991-04-01), Rhodes, Jr. et al.
patent: 5500168 (1996-03-01), Suzuki
Jones Kenneth M.
Kabushiki Kaisha Inoac Corporation
Simmons David A.
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