Landis & Gyr Betriebs Ag

Ohannes Minnetian

Gregor Antes

Alex Nyfeler

Michael Wessner

The operation of sticking stamps from a foil in strip form at predetermined locations on a substrate which has motifs printed thereon and which is pulled through at least one sticking station at a predetermined forward feed speed is effected by means of pressing portions, which are raised radially above a pressing cylinder, in the sticking station. The pressing portions have curved pressing surfaces which are parts of a larger cylindrical surface which is concentric with respect to the pressing cylinder and which during each sticking phase roll against a backing cylinder and transfer the stamps onto the substrate. The strip speed of the foil may also be lower than the forward feed speed. The foil used may be a hot embossing foil with a layer of adhesive or an embossing foil without a layer of adhesive, while the apparatus, for sticking the embossing foil onto the substrate has an applicator mechanism for adhesive upstream of the sticking station and an irradiation station for the activation of adhesive layers.

Apparatus for sticking on stamps from an embossing foil

An interlaminar sandwich comprises first and second lacquer layers, a diffraction structure embedded between the first and second lacquer layers, a heat activated adhesive layer disposed one one of the lacquer layers, and a transparent stabilization layer disposed over the other lacquer layer, the stabilization layer distributing heat evenly through the interlaminar sandwich so that when heat is applied to the stabilization layer, the adhesive layer will bond the interlaminar sandwich to a substrate. Preferably, the interlaminar sandwich also contains an intermediary layer between the stabilization layer and the first lacquer layer which bonds these layers together. At temperatures below 170.degree. C., the adhesive layer is bonded so intimately to the substrate that the interlaminar sandwich cannot be removed from the substrate without tearing it. At temperatures above 150.degree. C., the lacquer layers soften, thus destroying the diffraction structure. After being built up on a film, the interlaminar sandwich can be punched out in the form of a tag and attached to an identification document thereby protecting the document against attempts to remove the tag.

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Luzern, Switzerland

Ohannes Minnetian