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Method for manufacturing a mold for producing molded parts of large size and of a composite material

  • US 4,744,849 A
  • Filed: 04/07/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 09/19/1983
  • Status: Expired due to Fees
First Claim
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1. A process for producing a mold to make molded pieces with large dimensions, in particular pieces having a large length, and made of composite material, comprising forming a thick, rigid sheet metal mold cavity wall having an inner mold surface with an impression shape for pieces to be molded, and an exterior mold surface, the wall having high thermal conductivity, applying a plurality of electrical resistance heating elements on one of said inner and exterior mold surfaces of said wall and in direct contact with said wall, covering said wall plus heating elements with a layer which is at least partly made of metal that gives the layer thermal conductivity, covering said wall plus heating elements, at said exterior mold surface of said wall, with a layer of non-rigid synthetic resin foam having low density and being thermally insulating, and mounting said wall with its heating elements and layers to a mold frame.

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