Resin and wood fiber composite profile extrusion method

B - Operations – Transporting – 29 – C

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B29C 70/52 (2006.01) B27N 3/28 (2006.01) B29C 47/00 (2006.01) B29C 47/20 (2006.01)

Patent

CA 2258691

The invention relates to a method for forming a composition comprising a resin and wood fiber in the form of a composite that can be used to form a linear extrudate in the form of a structural member. The linear extrudate can have a profile cross section of any useful engineering shape. The profile is made using extruder processing. A unique extruder configuration is used that optimizes the composite strength by promoting the random orientation of fibers resulting in an isotropic flex modulus, tensile strength, impact resistance and other structural properties. Further, the extruder can include features that can cool the profile interior after leaving an exit die increasing the productivity and quality of the extruder manufacturing process. The method of the invention can be used with any thermoplastic resin useful in extrusion devices and preferably uses a wood fiber.

L'invention porte sur un procédé de formation d'un composite constitué d'une composition de résine et de fibres ligneuses pouvant servir à former un extrudat linéaire servant d'élément structurel. L'extrudat linéaire peut présenter toutes les sections des profilés usuels de l'industrie. Le profilé est obtenu à l'aide de techniques d'extrusion. On utilise à cet effet une configuration d'extrudeuse particulière qui optimise la résistance du composite en favorisant l'orientation aléatoire des fibres, d'où l'isotropie du module de flexion, des propriétés de résistance à la traction, de la résistance à l'impact et d'autres propriétés structurelles. De plus, l'extrudeuse peut offrir la possibilité de refroidir l'intérieur du profilé à la sortie de la filière, ce qui améliore la productivité et la qualité du processus de fabrication de l'extrudeuse. Le procédé objet de l'invention, qui s'applique à toute résine thermoplastique compatible avec les dispositifs d'extrusion, recourt de préférence à des fibres ligneuses.

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