A method and an apparatus for manufacturing an extruded...

B - Operations – Transporting – 32 – B

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B32B 27/08 (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 47/48 (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 9/12 (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 2250399

The invention relates to a method and an apparatus for manufacturing an extruded plastic product, the apparatus comprising at least one rotor (1) and at least one stator (2, 3) with a feed gap (4) provided between them, a groove (7) being situated on the other side of the feed gap (4), the groove pressing the material to be extruded out of the apparatus when the rotor (1) is rotated. The cross section of the groove (7) remains substantially unchanged. At the opposite side of the feed gap (4) there is positioned a countergroove (8) in such a way that a processing cavity consisting of the grooves (7), the countergrooves (8) and the clearance between them decreases at least partially continuously along the axis of the extruder. The deformation energy of the material can thus be kept as small as possible due to the unchanging cross section of the groove (7), and the material stays in the groove (7) due to the placement of the flights (7a, 8a). The material is made to move rotatably, which enables the manufacture of a laminar plastic product (11). Further, materials that would otherwise be difficult to process can also be extruded effectively.

L'invention porte sur un procédé ainsi que sur l'appareil correspondant permettant la production d'un article extrudé en matière plastique, lequel appareil comporte au moins un rotor (1) et au moins un stator (2, 3), un espace d'alimentation (4) étant ménagé entre eux. Une gorge (7), qui se trouve de l'autre coté de l'espace d'alimentation (4), est destinée à faire pression sur le matériau à extruder lorsque le rotor (1) est mis en rotation. La section transversale de la gorge (7) reste sensiblement la même. Sur le coté opposé de l'espace d'alimentation (4) se trouve une contre-gorge (8) de telle sorte qu'une cavité de traitement constituée des gorges (7), des contre-gorges (8) et du dégagement se trouvant entre ces dernières, diminue de façon continue, au moins partiellement, le long de l'axe de l'extrudeuse. On peut, de la sorte, maintenir l'énergie de déformation du matériau aussi faible que possible dans la mesure où la section transversale de la gorge (7) ne varie pas tandis que le matériau demeure dans la gorge (7) du fait de la position des spires (7a, 8a). On fait se déplacer le matériau en rotation, ce qui permet de fabriquer un article en matière plastique stratifié (11). Cette invention autorise, de surcroît, une extrusion en bonne et due forme de matériaux qui seraient, sans cela, difficile à traiter.

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