Screw and apparatus for plasticizing fiber-reinforced...

B - Operations – Transporting – 29 – C

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B29C 45/60 (2006.01) B29B 7/14 (2006.01) B29B 7/42 (2006.01) B29C 45/00 (2006.01) B29C 45/48 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2261584

A screw adapted for plasticizing a fiber-reinforced thermoplastic resin wherein screw lead (distance of the resin advancement in the direction of the axis per 1 revolution of the screw when it is postulated that the screw channel is 100% filled with the resin) of the screw in its compression section decreases in the direction toward the forward end of the screw. A plasticizing apparatus wherein such screw is mounted. A method for molding a fiber-reinforced thermoplastic resin by using such an apparatus. A molded article produced by such molding method. In the present invention, shear force of sufficient level can be obtained to avoid the formation of clumps while breakage of the reinforcing fibers is avoided to leave long fibers in the molded article. The resulting molded article has excellent mechanical properties, and such article is quite useful as a material for use in automobile parts and other parts.

Vis conçue pour être utilisée pour la plastification de résines thermoplastiques renforcées de fibres et dont la longueur d'avance (la distance d'avance de la résine dans le sens axial par tour de vis, à condition que la résine remplisse totalement la gorge de la vis) dans la partie compression de la vis est diminuée progressivement vers la pointe de la vis; dispositif de plastification équipé de cette vis; procédé de moulage de résines thermoplastiques renforcées au moyen de ce dispositif; produit obtenu par le moulage de résines thermoplastiques renforcées de fibres au moyen de ce procédé. Etant donné qu'on obtient une force de cisaillement suffisante, le produit est exempt de serrage, et les fibres de renforcement n'étant pas cassées, les fibres restant dans le produit moulé sont plus longues qu'habituellement et présentent des caractéristiques mécaniques excellentes. Ce produit est tout à fait approprié en tant que matériau de pièces, telles que des pièces automobiles.

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