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Method and apparatus for selective lamination of thermoplastic layers

  • US 4,356,052 A
  • Filed: 04/10/1981
  • Issued: 10/26/1982
  • Est. Priority Date: 01/12/1979
  • Status: Expired due to Term
First Claim
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1. An apparatus for the selective lamination of thermoplastic layers by heating and pressurizing the internal surfaces of at least two thermoplastic layers, at least one of said layers including one window portion in which at least one insert is located, said lamination not occurring in said window portion, said apparatus comprising:

  • first and second lamination plates, each of said plates defining an opening corresponding to the window portion of said at least one layer;

    a plug inserted in said opening of each plate;

    means for thermally insulating said plugs from said plates;

    means for discontinuously heating said first and second laminating plates, including resistance elements placed in said plates, said resistance elements having a greater packing density in the vicinity of the opening in each plate than in other areas of each plate; and

    means for pressing said plates together with said at least two thermoplastic layers therebetween, whereby said discontinuous heating means heats external surfaces of said layers less at said window portion than at the remainder of said layers.

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