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US 5,704,980 AGranted
Method of and apparatus for making plastic film with barrier layers
AssigneeCE.TE.V. Centro Technologie Del Vuoto
InventorsCarlo Misiano, Enrico Simonetti, Francesco Staffeti
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Abstract
A plastic wrapping film is provided with one or more aluminum layers by vapor deposition and the or each layer is only partially oxidized in an oxidizing plasma so that the resulting barrier layer is distinguishable by slight reduction in transparency but excellent prevention of penetration by moisture and oxygen.
Claims3
An apparatus for producing a plastic wrap which comprises:
- means for depositing upon a plastic film in a succession of stages, respective aluminum layers;
- means for partially oxidizing each of said aluminum layers;
- and
- control means for regulating oxidation of each of said aluminum layers so each of said aluminum layers is only partially oxidized.
1 more element
Dependencies are inferred from the claim text.