초록 ▼

The invention relates to a laminated tamper-evident structure which exhibits an irreversible color change upon delamination. The structure includes a laminate of at least two layers capable of generating a color by a light interference and absorption phenomenon that requires direct and intimate cont

The invention relates to a laminated tamper-evident structure which exhibits an irreversible color change upon delamination. The structure includes a laminate of at least two layers capable of generating a color 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 of transparent or translucent material is adhered to the laminate to facilitate the peeling operation. Upon peeling apart the laminate, the generated color 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.

대표청구항 ▼

A tamper-evident structure which comprises: a laminate capable of generating a substantially non-dichroic colour by a light interference and absorption phenomenon, consisting of a layer of a metal of medium light reflectivity and a layer of a metal oxide, said layer of metal oxide having been formed

A tamper-evident structure which comprises: a laminate capable of generating a substantially non-dichroic colour by a light interference and absorption phenomenon, consisting of a layer of a metal of medium light reflectivity and a layer of a metal oxide, said layer of metal oxide having been formed by anodization in the presence of fluorine ions, at least in areas of the laminate where a colour change is desired; and an overlying flexible strip of transparent or translucent material suitable for facilitating the peeling apart of said laminate, said strip having a strength of attachment to said laminate that is greater than the strength of attachment of said layers in said desired areas; whereby peeling apart of said layers results in loss of said generated colour at least in said desired areas and re-attachment of said layers fails to re-generate said colour.