Tamper indicating device
Assignee3M Innovative Properties Company
InventorsMark A. Wright, Raymond R. Rivera, Thomas P. Hanschen, Julian B. Cooley, Raymond R. Gosselin
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Abstract
The invention is a tamper indicating device including a backing. The backing includes a first phase and a second phase. The backing is normally light transmissive, but a peeling force causes the backing to internally delamninate and become opaque. A first skin layer is fixed to the backing wherein the skin layer minimizes pre-destruction of the backing. A layer of adhesive is applied to the first skin layer, which can be affixed to a substrate.
Claims28
A tamper indicating device, comprising:
- a backing including a first phase and a second phase, wherein the backing is light transmissive, and wherein a peeling force causes the backing to internally delaminate and become more opaque;
- a first skin layer fixed to the backing wherein the skin layer minimizes pre-destruction of the backing;
- and
- a layer of adhesive applied to the first skin layer.
A method for forming a tamper indicating device comprising:
- co-extruding a blown-film backing and a skin layer wherein the backing includes a first continuous phase and a second discontinuous phase wherein the backing is normally light transmissive and becomes opaque upon internal delamination;
- and
- applying a pressure sensitive adhesive to the skin layer opposite the backing.
Dependencies are inferred from the claim text.