| 摘要 |
<p>Method to produce multi-layer plates, whether flat or shaped, which can be employed to make covers for buildings, the multi-layer plates comprising super-imposed layers obtained by a process of extrusion from raw materials (12a, 12b, 12c) in powder form, in granules, in crystals, or in liquid form, possibly with additives, each layer being monocomponent, or multi-component, the method obtaining a multi-layer plate (115) with a plane surface leaving a coextrusion head (19) with flat lips, the multi-layer flat plate (115) being subjected to a calendering pass and thermal, chemical and dimensional stabilization, the multi-layer flat plate (215) emerging from the calendering and stabilization pass being then subjected to a pass of thermal adjustment and possibly shaping, the multi-layer plate (315) emerging from this pass then being cooled and sheared to size in order to obtain the multi-layer plates (15) of the desired length. Plant which achieves the method as described above. Multi-layer plate, flat or shaped, obtained by means of the method and with plant as described above.</p> |
