US 6,551,537 B2Granted

Manufacturing method for structural members from foamed plastic composites containing wood flour

AssigneeNan Ya Plastics Corporation

InventorKuei Yung Wang Chen

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Abstract

Structural members for doors and the like can be manufactured from plastic foamed composites containing wood flour by the steps of (1) dry mixing a blend of powders including PVC powder, wood flour, powdered thermal stabilizers, powdered fowning agent and a powdered gelatinization agent, (2) adding the mixed powder to a thermal stirring mixer to obtain a homogeneous dispersion of the several powders (3) 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 (4) 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. The 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.

Claims10

Dependent claims

A manufacturing method for making structural elements suitable for door frames, sealed strip or other structural members from foamed plastic resins/wood flour composites comprising the steps of:

combining powders composed of polyvinyl chloride powder, wood flour, powdered stabilizing agents, powdered foaming agents, powdered gelatinizing agents and powdered lubricating agents;
placing said combined powders in a thermal stirring mixer at a temperature between room temperature and 100 degrees centigrade and stirring at first a low speed to blend said combined powders, followed by stirring at a higher speed to disperse said powders in a homogeneous blend of said powders;
placing said homogeneous blend of said powders in a cold stirring mixer to reduce the temperature from 100 to 40 degrees centigrade by mixing at a low speed to dissipate the heat in said homogeneous blend of said powders to prevent agglomeration of said homogeneous blend of said powders to form a resulting feed stock for an extrusion machine;
and
adding said resulting feed stock to an extrusion machine and extruding foamed structural shapes therefrom.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/800,959Filed 8 Mar 2001
Published: US 2002/0125598 A112 Sep 2002
Granted: 22 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08J 9/0085
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof: use of fibrous compounding ingredients
B29C 44/50
Into an open space or onto moving surfaces, i.e. to make articles of indefinite length: using pressure difference, e.g. by extrusion or by spraying
C08J 2327/06
Containing chlorine atoms: homopolymers or copolymers of vinyl chloride
C08J
Working-up