Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1991-10-18
1992-09-22
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156634, 156665, B44C 122, C23F 100
Patent
active
051493969
ABSTRACT:
A selectively demetallized metal film is provided in which the metal film has different amounts of metal removed in different areas to provide a film having a graduated optical density from one area to another. The amount of metal present in the film can vary gradually and continuously or in stages resulting in a series of bands or patches. Each portion of the film appears uniform, homogeneous and uninterrupted to the unaided eye. The product is produced by providing a substrate such as plastic film having a thin semiconductive metal film coated thereon. Different amounts of the metal are removed from the film in different areas, preferably by exposing the metal film in different areas to different amounts of an etchant which can be provided in the form of minute droplets of one size in one area and of a different size in a different area. The etchant can be applied by halftone printing as variably sized dots on uniformly fixed centers with larger dots of etchant applied in some areas than in others to remove a greater amount of the metal.
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Golden Valley Microwave Foods Inc.
Harmon James V.
Powell William A.
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