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Chemical thermal pack and method of making same

  • US 4,856,651 A
  • Filed: 12/22/1987
  • Issued: 08/15/1989
  • Est. Priority Date: 12/22/1987
  • Status: Expired due to Fees
First Claim
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1. A thermal pack comprising:

  • an outer pouch having a pair of opposed faces arranged generally parallel to each other and defined by a single sheet of flexible plastic film folded along a predetermined fold line;

    a second sheet of flexible plastic film disposed between said pair of opposed faces;

    a continuous weld line circumscribing and sealing the periphery of said faces, said weld line bonding together the periphery of said faces and the periphery of said second sheet so that said second sheet and said opposed faces define first and second volumes within said outer pouch, said second sheet providing a common wall between said first and second volumes;

    a heat transfer material disposed in said first volume; and

    an insulating layer disposed in said second volume and substantially covering said second sheet.

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