Patent ID: 8262843
Filing Date: 2012-09-11
Classification: B29C,B29L,B32B,Y10T

Abstract:
1. Method of applying a multi-layer structure onto a substrate, the multi-layer structure being obtained from at least two initially flat individual films, said method comprising the following steps: /1/ providing the multi-layer structure configured so that said films remain firmly bonded to each other along respective facing surfaces (Σ /2/ applying a heat treatment to at least part of the multi-layer structure, with a maximum temperature of the heat treatment that is below the failure temperature, so that due to the particular application of the heat treatment the two films have different respective contractions or elongations after cooling of the structure to a use temperature, and a difference between said respective contractions or elongations of the films producing a curvature of the multi-layer structure, whereby the heat treatment of step /2/ itself produces the curvature of the structure, then /3/ applying the multi-layer structure onto a curved face (S