| 摘要 |
<p>The present patent relates to a production process for improving the surface quality of composites when the product to be manufactured requires an exterior finish of high quality and mechanical strength on the interior face. The subject matter of the present patent comprises a first step involving the extrusion of a thermoplastic film (1), with the option of obtaining multi-layer sheets (1'), aiming at total elimination of the painting process, said sheet being formed from an ordinary ABS layer (3), with base material, an intermediate ASA layer (4), allowing choice of colour for the finish and, at the same time, protection against UV rays, and a final layer formed by PMMA (acrylic) (5). Both the thermoplastic film (1) and the multi-layer thermoplastic sheet (1') are processed by means of an extruder (2) and conveyed to a vacuum-forming mould (6), all the details thereof being copied. When the sheet (1, 1') has been formed, it is conveyed to an RTM light mould (7), where it is positioned and subsequently the special glass-fibre web (8) is fitted thereon for injection. Next, the counter-mould (9) is closed, the thermosetting resin is injected, and the composite material (10) (resin + glass fibre) is obtained. After complete catalysis of the injected resin with the mould closed, said resin remains adhered to the thermoplastic sheet (1, 1'), forming a compound with a high-quality surface and high level of mechanical strength, resulting in the RTM-S process (11).</p> |
