Hid Global Corporation

R. Stahl Schaltgerate Gmbh

Andreas Griesbach

Manfred Michalk

Hermann Hecker

Franziska Hofmann

Jörg Stritzelberger

Stephan Piplack

The invention refers to a method for manufacturing such a functional laminate, the method comprising the following steps: providing at least one patchwork layer; stacking the patchwork layer with at least one other layer in order to obtain a stack of layers, wherein at least one proximate layer directly adjacent to the patchwork layer comprises at least one zone comprising a first material or a second material; laminating the stack of layers together by heat and/or pressure and/or gluing.

Functional laminate

A method to test the authenticity of a document (), such as an ID, a passport or a card, protected against forgery, wherein it comprises at least an inner co-laminated fabric layer () forming an optical watermark. This layer presents cuts, and so separated zones with fabric material and other zones without fabric material, forming well recognizable forms or pictures. Co-laminating one or a plurality of such fabric layers inside of the document body allows to create a multiple watermark having both surface relief and opacity effect, without adding any volume to the body of the document.

Method of checking the authenticity of a document with a co-laminated fabric layer inside

Growing community of inventors

Erfurt, Germany

Andreas Griesbach