B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/655
B29C 44/14 (2006.01) B29C 33/06 (2006.01) B29C 33/38 (2006.01)
Patent
CA 1081418
ABSTRACT OF THE DISCLOSURE Disclosed herein is a method for producing foamed articles, such as seat cushions for a riding lawn mower or the like, including 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, and providing a thin layer of an electrically conductive material on each mold section, which layer forms the molding surface and serves as a radio frequency electrode. A foamable and heat curable material is introduced into the mold cavity and a radio frequency voltage is applied 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 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.
265957
Lestan Ivan
Mirr Gordon J.
Stevens Myron T.
Na
Outboard Marine Corporation
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