Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1996-06-26
1998-03-17
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 468, 264313, 264334, 264335, 264338, B29C 4402, B29C 4142
Patent
active
057283338
ABSTRACT:
A molded article of rigid polyurethane foam is manufactured by using a mold of separable upper and lower mold sections mated to define a cavity therebetween. A film of polypropylene which is previously vacuum formed in conformity to the mold cavity is closely set within the cavity and secured to the lower mold section outside the cavity. A rigid polyurethane foam-forming raw material is introduced into the cavity and on the film and caused to foam and expand in place to mold an article of rigid polyurethane foam. Thereafter, the molded article is lifted together with the film from the mold cavity by a pneumatic pressure or ejector pin. The molded article is stripped from the film to remove only the molded article from the mold without taking the entire film out of the mold. The once lifted film is returned to the original shape by vacuum suction for replacing the film in the cavity.
REFERENCES:
patent: 3576930 (1971-04-01), Watters et al.
patent: 4956141 (1990-09-01), Allen et al.
patent: 5635119 (1997-06-01), Carson
Fujita Taikyu
Hashimoto Torao
Nabeshima Yoichi
Tabata Keiichiro
Yokoyama Kazufumi
Bridgestone Corporation
Kuhns Allan R.
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