Plastic wood fiber foam structure and method of producing same

Details Plastic wood fiber foam structure and method of producing same Plastic wood fiber foam structure and method of producing same

B - Operations, Transporting

29

C

B29C 70/06 (2006.01) B27N 1/00 (2006.01) B27N 3/00 (2006.01) B27N 3/28 (2006.01) B29C 47/00 (2006.01) B29C 47/10 (2006.01) B29C 47/50 (2006.01) C08J 9/00 (2006.01) B29C 44/12 (2006.01)

Patent

CA 2384968

A process for producing plastic/wood fiber composite foamed structures includes the steps of pre-drying wood fiber filler; mixing it with plastic to form a mixture; feeding the mixture into an extruder; introducing and mixing a blowing agent; subject the mixture to high shear forces and extruding the mixture to produce a plastic/wood fiber composite foamed structure. The filler has a degradation temperature and an active volatization temperature. During the pre-drying step the temperature is maintained below the degradation temperature. During the mixing step the mixing temperature is maintained below the active volatilizing temperature. During the introducing and mixing step a blowing agent is introduced into the plastic/wood fiber mixture and is mixed therewith to produce a plastic/wood fiber/gas mixture. During the subjecting step the plastic/wood fiber/gas mixture is subjected to high shear forces in the presence of high pressures and the temperature is maintained below an active volatilizing temperature.

Processus de production structures en mousse de composite plastique/fibre bois comprenant les opérations suivantes : préséchage du remplissage de fibre de bois, ajout de plastique pour former un mélange, transfert du mélange dans une extrudeuse; introduction et mélange d'un agent d'expansion; exposition du mélange à des forces de cisaillement élevées et extrusion du mélange pour produire une structure en mousse de composite de plastique/fibre de bois. Le remplissage a une température de dégradation et une température de volatilisation. Lors du préséchage, la température est maintenue sous la température de dégradation. Lors du mélange, la température est maintenue sous la température de volatilisation. Lors de l'introduction et du mélange, un agent d'expansion est ajouté au mélange de plastique/fibre de bois et est mélangé à ce dernier afin d'obtenir un mélange de plastique/fibre de bois/gaz. Lors de l'opération où le mélange est soumis à des forces de cisaillement élevées sous hautes pressions, la température est maintenue sous la température de volatilisation active.

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