An extrusion apparatus and method, a tubular product, and a...

Details An extrusion apparatus and method, a tubular product, and a... An extrusion apparatus and method, a tubular product, and a...

F - Mech Eng,Light,Heat,Weapons

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F16L 9/12 (2006.01) B29B 15/12 (2006.01) B29C 44/22 (2006.01) B29C 47/00 (2006.01) B29C 47/02 (2006.01) B29C 47/06 (2006.01) B29C 47/20 (2006.01) B29C 47/24 (2006.01) B29C 47/52 (2006.01) B29C 47/76 (2006.01) B29C 47/90 (2006.01) B29C 47/94 (2006.01) B29C 55/00 (2006.01) B29C 55/24 (2006.01) B29C 63/34 (2006.01) B29C 70/50 (2006.01) B32B 1/08 (2006.01) F16L 9/14 (2006.01) F16L 9/147 (2006.01) F16L 9/21 (2006.01) F16L 11/15 (2006.01) F16L 55/162 (2006.01) B29C 53/58 (2006.01)

Patent

CA 2225419

An extrusion apparatus and method, and a tubular product and a pipe made of several different materials. The extrusion apparatus according to the invention comprises at least one stator (1, 6, 10), at least one rotor (2, 2a, 2b), and at least one annular feed gap (3) situated between the stator (1, 6, 10) and the rotor (2, 2a, 2b). The diameter of the feed gap (3) decreases at least partly continuously in the direction of flow of the plastic material to be extruded, and its diameter also increases continuously at least at a section of its length in the aforementioned direction of flow. With such a construction, the pressure acting on the structure of the extrusion apparatus can be considerably balanced, i.e. the apparatus can be made more durable. The invention also relates to a tubular product and a pipe made of several different materials.

Cette invention concerne un appareil et un procédé d'extrusion, ainsi qu'un produit tubulaire et un tuyau faits de divers matériaux. D'après cette invention, l'appareil d'extrusion comprend au moins un stator (1, 6, 10), au moins un rotor (2, 2a, 2b) et au moins un espace d'alimentation annulaire (3) situé entre le stator (1, 6, 10) et le rotor (2, 2a, 2b). Le diamètre de l'espace d'alimentation (3) décroît au moins partiellement et de manière continue dans le sens de l'écoulement du matériau plastique à extruder. Ce diamètre augmente également de manière continue au niveau d'une partie au moins de la longueur dudit espace, et dans le même sens d'écoulement. Une telle construction permet d'équilibrer sensiblement la pression qui s'exerce sur la structure de l'appareil d'extrusion, ce qui permet d'allonger la durée de vie de ce dernier. Cette invention concerne également un produit tubulaire et un tuyau faits de plusieurs matériaux différents.

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