Unverletzliche Sicherheitsstrukturen.

摘要

The invention relates to a laminated tamper-evident structure which exhibits an irreversible colour change upon delamination. The structure includes a laminate of at least two layers (10,12) capable of generating a colour by a light interference and absorption phenomenon that requires direct and intimate contact between an adjacent two of the layers. The strength of attachment among the layers of the laminate is such that the laminate can be uniformly and reliably peeled apart at the interface between the adjacent two layers. An overlying flexible strip (14) of transparent or translucent material is adhered to the laminate to facilitate the peeling operation. Upon peeling apart the laminate, the generated colour is irreversibly lost, thus providing evidence that the structure has been tampered with. The structure can be incorporated into a variety of closable articles or products to provide evidence of opening or tampering.