A method of forming a light-weight, fiber-reinforced...

B - Operations – Transporting – 29 – C

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B29C 44/42 (2006.01) B29C 44/04 (2006.01) B29C 44/58 (2006.01) B29C 45/00 (2006.01) B29C 45/56 (2006.01)

Patent

CA 2235881

The method of forming a light-weight, fiber-reinforced, particularly glass fiber-reinforced-thermoplastic resin product includes the steps of melting and mixing thermoplastic resin pellets containing parallely oriented fibers 2-100 mm long, injecting the melted resin into a cavity which is closed so that its volume is smaller than that of the final molded product, and, before or after the resin injection is completed, opening the cavity until its volume is equal to that of the final molded product. Unlike the conventional injection-molded products, this product does not require a foaming agent and, if it uses any, requires only a small amount of foaming agent. The product thus formed is light in weight and has fibers uniformly entangled inside, providing an excellent appearance of the surface. Further a skin layer is formed over the surface. These features combined with the reinforcement by the glass fibers offer high strength and high stiffness.

Ce procédé de fabrication d'un article léger en résine thermoplastique renforcé de fibres, et notamment de fibres de verre, consiste à faire fondre et à mélanger des boulettes de résine thermoplastique contenant des fibres à orientation parallèle de 2 à 100 mm de long, à injecter cette résine fondue dans une cavité qui est fermée de façon que son volume soit inférieur à celui de l'article moulé à fabriquer et, avant ou après achèvement de l'injection de résine, à ouvrir cette cavité jusqu'à ce que son volume égale celui de l'article moulé final. Contrairement aux articles moulés par injection de façon conventionnelle, celui-ci n'exige pas d'agent moussant ou alors en très faible quantité. L'article obtenu est léger et contient des fibres à enchevêtrement uniforme, tout en présentant une surface d'excellent aspect. De plus, une peau se forme sur cette surface. Ces caractéristiques, combinées au renforcement par les fibres de verre, procurent à l'article une résistance et une rigidité élevées.

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