Method and apparatus for blow molding large reinforced...

B - Operations – Transporting – 29 – C

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B29C 49/04 (2006.01) B29C 44/14 (2006.01) B29C 49/00 (2006.01) B60K 11/04 (2006.01) B60R 19/03 (2006.01) B60R 19/48 (2006.01) B60S 1/50 (2006.01) B62D 21/16 (2006.01) B62D 25/08 (2006.01) B62D 29/04 (2006.01) B60R 19/18 (2006.01)

Patent

CA 2355642

A method for molding large parts, comprises the steps of providing a reinforced plastic melt (41) comprising at least one thermoplastic material and reinforcement particles dispersed within the at least one thermoplastic material, the reinforcement particles comprising less than 15% of a total volume of the plastic melt, at least 50% of the reinforcement particles having a thickness of less than about 20 nanomenters, and at least 99% of the reinforcement particles having a thickness of less than about 30 nanometers; communicating a tubular formation of the plastic melt to a mold assembly having a mold cavity (44) defined by mold surfaces (43), the mold surfaces (43) corresponding to a configuration of the part to be molded; applying pressurized gas to an interior of the tubular formation to expand the tubular formation into conformity with the mold surfaces (43); and solidifying the plastic melt to form the part; and removing the pan from the mold assembly.

L'invention concerne un procédé de moulage de grandes pièces, qui consiste à disposer d'une matière plastique renforcée fondue (41) comprenant au moins un matériau thermoplastique et des particules de renforcement dispersées à l'intérieur d'au moins un matériau thermoplastique. Les particules de renforcement comprennent moins de 15 % d'un volume total de la matière plastique fondue, au moins 50 % des particules de renforcement ayant une épaisseur inférieure à environ 20 nanomètres, et au moins 99 % des particules de renforcement ayant une épaisseur inférieure à environ 30 nanomètres. Le procédé consiste ensuite à transférer une formation tubulaire de la matière plastique fondue dans un moule (29) ayant une cavité (44) du moule délimitée par des surfaces (43) du moule, lesquelles (43) correspondent à une configuration de la pièce à mouler; puis à appliquer un gaz sous pression sur une partie interne de la formation tubulaire pour expanser cette dernière et l'amener à épouser les formes des surfaces (43) du moule. Le procédé consiste enfin à solidifier la matière plastique fondue pour former la pièce; puis à extraire ladite pièce du moule.

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