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Formation of laminated packaging blanks

  • US 3,987,711 A
  • Filed: 04/09/1975
  • Issued: 10/26/1976
  • Est. Priority Date: 04/10/1972
  • Status: Expired due to Term
First Claim
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1. A method for forming and sealing a moisture-resistant package using a foldable blank made of a fibrous material substrate laminated by a heat-weakenable laminant to moisture-resistant sheeting, the blank having at least one unsupported sheeting portion along at least one free edge of said blank, wherein the method includes the steps of folding said blank so that said unsupported portion lies adjacent another region of said sheeting, applying heat and pressure directly to said unsupported portion while it is in contact with said other sheeting region to seal it thereto while simultaneously melting the laminant by which said other sheeting region is adhered to said substrate and detaching same therefrom, and folding and sealing said detached substrate to complete the formation of a part of the package.

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