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Plastic mold structure and method of making

  • US 5,124,192 A
  • Filed: 11/15/1989
  • Issued: 06/23/1992
  • Est. Priority Date: 11/15/1989
  • Status: Expired due to Fees
First Claim
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1. A mold structure for forming an article from a heated, softened plastic material, said structure comprising:

  • a mold core having a thermal conductivity in the range of about 1×

    10-2 to 1×

    10-1 cal/cm. sec. °

    C. and having a mold cavity, said mold cavity having at least one surface which comprises a recessed portion and a non-recessed portion; and

    an insulating mold layer having a thermal conductivity in the range of about 1×

    10-4 to 5×

    10-3 cal/cm. sec. °

    C. and formed in and filling said recessed portion so as to provide a substantially continuous surface.

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