Dies for making extruded synthetic wood and methods relating...

B - Operations – Transporting – 29 – C

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B29C 47/70 (2006.01)

Patent

CA 2738798

The present invention is directed to extrusion dies for making extruded synthetic wood and methods relating thereto. The dies include adapter dies, transition dies, stranding dies, and molding dies. The adapter dies include a channel with a restricted cross-sectional area. The stranding dies include a plurality of non-uniform channels that differ in length, cross-sectional area, cross-sectional shape, or combinations thereof. The transition dies are coordinately configured with the stranding die to adjust the flow rate of the extrudate. Particular configurations of dies upstream of the molding die allow for higher compression ratios in the molding die than previously feasible. Each of the dies described herein may be used individually with standard dies known in the art. Alternatively, the dies may be used in combination to form integrated units. The dies described herein allow for making stronger, more consistent synthetic wood at greater output rates than previously possible.

La présente invention concerne des filières dextrusion permettant la fabrication de bois synthétique ainsi que des procédés correspondants. Les filières comportent des filières dadaptation, des filières de transition, des filières à torons, et des filières de moulage. Les filières dadaptation comportent un passage avec une section transversale restreinte. Les filières à torons comportent une pluralité de passages non uniformes qui sont de longueurs, de sections transversales, et de formes transversales, ou des combinaisons de celles-ci qui sont différentes. Les filières de transition sont configurées de manière coordonnée avec la filière à torons pour ajuster le débit de lextrudat. Des configurations particulières des filières en amont de la filière de moulage permettent des rapports de compression supérieurs dans la filière de moulage à ceux de lart antérieur. Chacune des filières selon la présente invention peut être utilisée individuellement avec des filières classiques de lart antérieur. En variante, les filières peuvent être utilisées pour la fabrication de bois synthétique plus résistant et plus consistant à des taux de production supérieurs à ceux connus précédemment.

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