Apparatus and method for low-density cellular wood plastic...

Details Apparatus and method for low-density cellular wood plastic... Apparatus and method for low-density cellular wood plastic...

B - Operations, Transporting

29

C

B29C 44/34 (2006.01) B29C 44/22 (2006.01)

Patent

CA 2543712

An agent such as a blowing agent comprised of a chemical blowing agent or a physical blowing agent, for example a gas, is added to wood, plastic material. A low-pressure C02 tank or an air compressor with a refrigerated air dryer is attached either at or after the vent zone of a standard twin-screw extruder to insert the gas. During or after extrusion, the gas is dissolved in the wood- plastic melt material. The material expands which foams the wood-plastic material reducing the density of the final product.

Un agent, notamment un agent d'expansion, constitué d'un agent d'expansion chimique ou d'un agent d'expansion physique, notamment un gaz, est ajouté à une matière en plastique et en bois. Un réservoir de C0¿2? faible pression ou un compresseur à air présentant un séchoir d'air réfrigéré est fixé au niveau de ou après la zone de ventilation d'une extrudeuse à double vis standard de manière à y insérer le gaz. Pendant ou après l'extrusion, le gaz est dissous dans la matière fusionnée en bois-plastique. Cette matière gonfle et provoque l'expansion de la matière en bois-plastique réduisant ainsi la densité du produit final.

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