Method for preparation of composite materials

B - Operations – Transporting – 29 – C

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B29C 69/00 (2006.01) B29B 9/14 (2006.01) B29B 13/02 (2006.01) B29B 13/10 (2006.01) B29B 15/08 (2006.01) B29B 17/00 (2006.01) B29C 47/00 (2006.01) B29C 47/02 (2006.01) B29C 47/28 (2006.01) B29C 47/38 (2006.01) B29C 70/50 (2006.01) B29C 70/52 (2006.01) B29C 71/04 (2006.01)

Patent

CA 2046995

A process for preparing a composite from an intake material comprising a mixture of plastic and fibrous material comprises first granulating and sizing the material. The material is then heated in three consecutive phases, first at a temperature sufficient to achieve an internal temperature within the material of about 215 to 250 °F, then at a temperature sufficient to achieve an internal temperature within the material of about 250 to 320 °F and then at a temperature sufficient to achieve an internal temperature within the material of about 320 to 400 °F, wherein said material is continuously mixed during said heat phases. The material may then be co-extruded with a reinforcement structure and forced into vacuum profile dies or compression molded and to form a product and cooled,

Cette invention concerne la préparation d'un composite à partir d'une matière première composée d'un mélange de plastiques et de matières fibreuses. Après granulation de la matière première et calibrage des granules, la charge continuellement malaxée est chauffée en trois phases consécutives élever sa température interne successivement à 215 à 250 degrés F, à 250 à 320 degrés F et à 320 à 400 degrés F. La charge peut alors être co-extrudée avec un matériau de renfort et forcée dans des filières de profilage sous vide ou moulée par compression à forme voulue, l'article obtenu étant refroidi par la suite.

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