Importance

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Abstract

A security bag includes a tamper-evident closure which provides a visual indication if the closure is opened. The closure includes an ink layer deposited on one wall of the security bag or on a flexible strip secured to one wall of the security bag, and an adhesive layer in overlying relationship with the ink layer for sealing the bag closed. The ink layer includes a release material deposited in a predetermined pattern, and a layer of a solid ink applied over the release material so that the predetermined pattern of the release material is not visible in the closure. The solid ink layer includes void spaces arranged in a predetermined pattern. Preferably, the pattern of the void spaces is out of registry with the pattern of the release material so that the void spaces and release material overlap to varying degrees in the closure. If the closure is forced open, the solid ink will delaminate from the surface on which it is printed, revealing in the closure the predetermined pattern of the release material. Because the release material and the void spaces overlap by varying degrees, it is difficult to use a quick-drying marker or other coloring technique to fill in the pattern created by the release material so as to conceal an unauthorized opening of the bag.

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First Claim