Laminate for making tubes
AssigneeCrown Zellerbach Corporation
InventorEdward J. Zuscik
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Abstract
The stiffness and deadfold properties of laminates used to make toothpaste tubes are improved by including a layer of high density polyethylene as one of the layers of the laminate. The use of high density polyethylene obviates the need to use a layer of paper or thick foil to provide stiffness and deadfold. The laminates containing high density polyethylene also have excellent strength and other properties which make them especially suitable for making tubes used to package toothpaste or other substances.
Claims7
In a laminate suitable for forming a tube used to dispense a substance packaged therein, the laminate comprising a heat sealable polymeric layer, a first adhesive layer, a layer of metal foil, a second adhesive layer, a layer providing stiffness and deadfold properties, and an outer polymeric layer, the improvement wherein the layer providing stiffness and deadfold properties is a layer of high density polyethylene.
The laminate of claim 7 having a Gurley stiffness greater than about 600 mg and a deadfold recovery of less than about 85 degrees.
Dependencies are inferred from the claim text.