Patent ID: 6551537
Filing Date: 2003-04-22
Classification: B29C,C08J

Abstract:
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.