Abstract: A thermal pack including an outer pouch having a pair of opposed faces arranged generally parallel to each other and defined by a single sheet of plastic film folded along a predetermined fold line. A second sheet of plastic film is disposed between the pair of opposed faces. A continuous weld line circumscribes the periphery of the faces, with the weld line bonding together the periphery of the faces and the periphery of the second sheet to define first and second volumes within the outer pouch. The second sheet provides a common wall between the first and second volumes. A heat transfer material is disposed in the first volume and an insulating layer is disposed in the second volume, substantially covering the second sheet.

Abstract: A microwavable thermal pack and a method of heating the pack. The thermal pack is a completely sealed envelope constructed from opposed laminate layers, portions of which are joined by sealed seams. The layers define an inner chamber within which is disposed a heat transfer material. Each of the laminate layers includes a pair of co-extensive inner and outer films contacting each other throughout their surface areas. The films are selected so that the laminate layers of the thermal pack do not pass the heat transfer material during heating of the heat transfer material within the thermal pack which is equivalent to the energy developed by a microwave device operating at full power for a period of time greater than about one minute but less than about four minutes.

Abstract: A thermal pack including an outer pouch having a pair of opposed faces arranged generally parallel to each other and defined by a single sheet of plastic film folded along a predetermined fold line. A second sheet of plastic film is disposed between the pair of opposed faces. A continuous weld line circumscribes the periphery of the faces, with the weld line bonding together the periphery of the faces and the periphery of the second sheet to define first and second volumes within the outer pouch. The second sheet provides a common wall between the first and second volumes. A heat transfer material is disposed in the first volume and an insulating layer is disposed in the second volume, substantially covering the second sheet.

Abstract: Microwavable instant and/or cold pack gel package including an envelope fabricated from a laminate, for example, of films of synthetic resins and an aqueous gel in said envelope.