Composite envelope composed of a heat-shrinkable foil with a rei

Stock material or miscellaneous articles – Hollow or container type article – Shrinkable or shrunk

Patent

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428 81, 428913, 428224, 428222, 428228, 428231, 428364, 428371, 4284744, 4284111, 428192, 428 352, 428 3691, 428 359, 174DIG8, 174136, 285381, B65B 5300, F16B 400

Patent

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051716178

ABSTRACT:
A composite envelope composed of a heat-shrinkable foil with a reinforcing layer containing tear-resistant fibers. The reinforcing layer is formed of a material which will melt below or at the temperature to which the heat-shrinkable foil is heated to stretch the foil and cause it to shrink back to its original condition so that the tear-resistant fibers are free to move in the melted material. Preferably, the composite is formed by providing carrier elements either having the fibers wrapped thereon or contained therein and assembling them with the shrinkable foil, heating to a stretching temperature to cause a melting of the carrier elements and stretching the foil at that temperature to create the memory and then holding the stretching forces until the foil has cooled to solidify the material of the carrier elements to form the reinforcing layer.

REFERENCES:
patent: 4816326 (1989-03-01), Jones et al.
patent: 4877660 (1989-10-01), Oberbergh et al.
patent: 4944987 (1990-07-01), Cordia et al.

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