Method of making tamper-evident structures

Details Method of making tamper-evident structures Method of making tamper-evident structures

1989-01-11

1991-05-14

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156289, 1563084, 428 43, 428469, 428915, 428916, B32B 3100, B32B 3120, B65D 6528

Patent

active

050153188

ABSTRACT:
The method involves forming a laminate capable of generating a substantially non-dichroic color by a light interference and absorption phenomenon by depositing a layer of a metal of medium light reflectivity by a vapor deposition technique on a suitable substrate, anodizing a surface of the metal in the presence of fluorine ions to form a detachable film of an oxide of the metal on the surface having a thickness suitable for color generation, and adhering a flexible strip of transparent or translucent material over the oxide film in such a manner that the strength of attachment of the flexible strip to the oxide film exceeds the adhesive strength between the oxide film and said surface of said metal.

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