Method and apparatus for making an extrusion product, and an...

B - Operations – Transporting – 29 – C

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B29C 47/88 (2006.01) B29C 44/22 (2006.01) B29C 47/00 (2006.01) B29C 47/02 (2006.01) B29C 47/24 (2006.01) B29C 47/90 (2006.01) B29C 47/94 (2006.01) B29C 49/20 (2006.01) B29C 55/24 (2006.01) B32B 1/08 (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 2231860

The invention relates to an extruder with which material is extruded through a tool (2). Fluoropolymer is used between the extrusion material and the tool (2) for reducing friction between the material and the tool. At least the surface of the tool (2) against fluoropolymer is if a material whose thermal conductivity is greater than the thermal conductivity of ordinary tool steel. Therefore the friction heat generated can be conducted efficiently away from the interface between the tool (2) and the extrusion material towards the tool (2), whereby the wear of fluoropolymer can be reduced and thus the durability of the tool (2) can be improved. In that case the extrusion product will slip evenly out from the tool (2), whereby the surface of the product is essentially smooth without transverse microscopic stripes repeated at a specific wave length.

L'invention porte sur une extrudeuse permettant l'extrusion d'une matière par l'intermédiaire d'un outil (2). On place un polymère fluoré entre la matière pour extrusion et l'outil (2) afin de réduire leur frottement. Les surfaces de l'outil (2) en contact avec le polymère fluoré, l'une de celles-ci, au moins, sont constituées d'un matériau dont la conductivité thermique est supérieure à celle d'un acier à outils usuel. De ce fait, la chaleur produite par le frottement peut être efficacement refoulée en dehors de la jonction entre l'outil (2) et le matériau appliqué contre celui-ci, ce qui retarde l'usure du polymère fluoré et augmente la durabilité de l'outil(2). Le produit à extruder est, en ce cas, à même de s'écouler régulièrement hors de l'outil (2), ce qui permet d'obtenir une surface quasiment lisse et exempte de stries microscopiques transversales se répétant sur une longueur d'onde spécifique.

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