Extrusion method, extruder and extruded product

B - Operations – Transporting – 29 – C

Patent

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B29C 47/48 (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 47/24 (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) C08J 5/04 (2006.01) F16L 9/12 (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 2250697

An extruder according to the invention comprises at least two annular conical feed gaps (9) one within the other, formed between a rotatable rotor (1) and a stator (4, 5). At least some of the material to be extruded is subjected in the different feed gaps (9) of the extruder alternately to a higher pressure and then to a lower pressure. The rotor (1) or stator (4, 5) between the feed gaps (9) can then be balanced such that the pressure effect provides a hydrodynamic bearing, whereby, when the extruder is used, even at worst a very small force is exerted on the other bearings of the rotor (1) or stator (4, 5). By the method of the invention, a product can also be produced which contains cross-linked and at least partly oriented polyethylene.

Une extrudeuse selon l'invention comprend au moins deux espaces d'alimentation (9) coniques, annulaires, situés l'un dans l'autre, formés entre un rotor rotatif (1) et un stator (4, 5). Au moins une partie du matériau à extruder est soumise dans les différents espaces d'alimentation (9) de l'extrudeuse, alternativement à une pression très élevée, puis à une pression très basse. Le rotor (1) ou stator (4, 5) se trouvant entre les espaces d'alimentation (9) peuvent ensuite être équilibrés de façon que l'effet de la pression forme un palier hydrodynamique grâce auquel, lorsque l'extrudeuse est en utilisation, même dans le pire des cas, une petite force est exercée sur les autres paliers du rotor (1) ou stator (4, 5). Par ce procédé, il est également possible d'obtenir un produit qui renferme un polyéthylène réticulé et au moins partiellement orienté.

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