Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1977-08-15
1979-01-16
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 466, 264 468, 264 51, B29D 2704
Patent
active
041349423
ABSTRACT:
Disclosed herein is a method for producing foamed articles, such as seat cushions for a riding lawn mower or the like, which method includes the steps of providing a mold having at least two separable, electrically insulated mold sections, which, when positioned together in a molding position, cooperate to define a molding chamber having the shape of the article, providing each mold section with a separate radio frequency electrode, introducing a foamable and heat curable material into the mold cavity, and applying a radio frequency voltage across the electrodes, and thus through the foamable and heat curable material, after the mold sections are positioned together in a molding position. The resultant internal heating of the material rapidly cures the material to a hardened condition and without generating high internal pressure forces inside the molding chamber.
In one embodiment, a skin-forming material, such as a sheet or film of a flexible thermoplastic resin, is laid over the mold cavity of one of the mold sections and is vacuum formed into conformity with the contour of the molding section surface and a foamable and heat curable pad-forming material is introduced into the molding chamber on top of the skin-forming material prior to the application of the radio frequency voltage.
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Lanigan, W. J. "Microwave Curing of Flexible Polyurethane Foam Mouldings," in British Plastics, Oct. 1963, pp. 562-565.
Lestan Ivan
Mirr, deceased Gordon J.
Stevens Myron T.
Anderson Philip
Outboard Marine Corporation
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