B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/32 (2006.01) B27N 1/00 (2006.01) B29B 7/74 (2006.01) B29C 44/50 (2006.01) B29C 47/10 (2006.01) C08J 3/20 (2006.01) C08L 27/06 (2006.01) C08L 97/02 (2006.01) E04C 2/26 (2006.01) E04C 3/29 (2006.01)
Patent
CA 2342532
Structural members for doors and the like can be manufactured from plastic foamed composites containing wood flour. These structural members are formed by dry mixing a blend of powders including PVC powder, wood flour, powdered thermal stabilizers, powdered foaming agent and a powdered gelatinization agent; adding the mixed powder to a thermal stirring mixer to obtain a homogeneous dispersion of the several powders; transferring the homogeneous dispersion of powders to a cold stirring mixer and stirring at speeds sufficient to avoid agglomeration of the homogeneous dispersion of the several powders; and placing the non-agglomerated homogeneous dispersion of the several powders in a feeding hopper of an extrusion machine and extruding shapes for the desired components. Vacuum venting of the extrusion machine can be controlled to achieve components with more desirable surface features. Lubricants can be added to the homogeneous dispersions of the several powders to aid in the extrusion process.
Kirby Eades Gale Baker
Nan Ya Plastics Corporation
LandOfFree
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