Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1992-11-24
1994-03-08
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 453, 264 464, 264 54, 264266, 2643287, B29C 6722
Patent
active
052924653
ABSTRACT:
A process for preparing a composite foamed molded article according to the invention includes the steps of setting a skin material in the vicinity of an upper mold for stamping-mold kept at a temperature of 10 to 50.degree. C.; feeding a molten polypropylene resin composition for a substrate containing a foaming agent kept at a temperature of not lower than a decomposition temperature of the foaming agent and within the range of 180 to 240.degree. C. onto a surface of a lower mold for stamping-mold kept at a temperature of 30 to 80.degree. C.; closing the mold within 10 seconds after feeding of the composition to clamp the molds at a pressure of 20 to 70 kg/cm.sup.2 ; lifting the upper mold before a thickness of each of hardened layers formed on both surfaces of the composition layer reaches 1.0 mm to open the mold at a distance between the upper mold and lower mold of 1.1 to 2 times of a thickness of a flat portion having neither boss nor rib in the composition layer, thereby to foam the composition; and cooling the foamed substrate layer made of the polypropylene resin composition to harden the substrate layer. The composite foamed molded articles thus obtained is lightweight and has high rigidity.
REFERENCES:
patent: 3493449 (1970-02-01), Krug
patent: 3546221 (1970-12-01), Johnson
patent: 3793415 (1974-02-01), Smith
patent: 4059660 (1977-11-01), Roth et al.
patent: 4264544 (1981-04-01), Wilheim
patent: 4535574 (1985-08-01), Dettelbach et al.
patent: 4873041 (1989-10-01), Masui et al.
patent: 4923539 (1990-05-01), Spengler et al.
patent: 5034076 (1991-07-01), Masui et al.
patent: 5122320 (1992-06-01), Masui et al.
patent: 5130075 (1992-07-01), Hara et al.
World Patents Index Latest Derwent Publications Ltd., London, GB AN 92-419507 [51]; DW9251 & JP-A-4314530 (Mitsuiya) Nov. 5, 1992.
World Patents Index Latest Derwent Publications Ltd., AN 87-304116 [43]; DW 8743 & JP-A-62214938 (Mitsui) Sep. 21, 1987.
World Patents Index Latest Derwent Publications Ltd., London, GB AN 92-126239 [16]; DW9216 & JP-A-4059840 (Tonen) Feb. 26, 1992.
Inoue Toru
Kobayashi Tosio
Watari Mitsuru
Kuhns Allan R.
Mitsui Petrochemical Industries Ltd.
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