A tubular product and an extrusion apparatus and method

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 9/12 (2006.01) B29C 47/06 (2006.01) B32B 1/08 (2006.01) F16L 9/14 (2006.01) F16L 11/118 (2006.01) F16L 11/15 (2006.01) F16L 55/04 (2006.01) F17D 5/06 (2006.01)

Patent

CA 2233030

An extrus on apparatus and method, and a tubular product 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 made of several different materials.

Dispositif et méthode d'extrusion, et produit tubulaire fabriqué de plusieurs matériaux différents. Le dispositif d'extrusion de l'invention comprend au moins un stator (1, 6, 10), au moins un rotor (2, 2a, 2b) et au moins un espace annulaire d'alimentation (3) situé entre le stator (1, 6, 10) et le rotor (2, 2a, 2b). Le diamètre de l'espace d'alimentation (3) diminue, du moins en partie, de manière continue dans la direction de l'écoulement de la matière plastique à extruder, et son diamètre augmente aussi de manière continue au moins dans une section de sa longueur dans la direction susmentionnée de l'écoulement. Grâce à une telle construction, la pression qui agit sur la structure du dispositif d'extrusion peut être considérablement équilibrée; le dispositif peut donc être fabriqué de manière à durer plus longtemps. L'invention porte également sur un produit tubulaire fabriqué de plusieurs matériaux différents.

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