| 摘要 |
A curved multi-layer structure (10) is formed from individual films (1, 2) that are initially flat. The films are firmly bonded to each other along respective facing surfaces. A heat treatment is applied to one or both of the films (1, 2) of the structure so as to cause respective contractions or elongations that are different for the two films at standard use temperatures. A difference between said contractions or elongations causes the curvature of the multi-layer structure. The structure thus has a permanent curved shape, without contact between compression-forming instruments and a useful part of the multi-layer structure being necessary. The multi-layer structure can then be applied onto a curved substrate without causing any tears or ripples. |
