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US 5,312,573 AGranted
Process for extruding mixtures of thermoplastic and thermoset materials
AssigneeRenewed Materials Industries, Inc.
InventorsJames E. Rosenbaum, Frank R. Keith
Life of this patent
Estimating the term…
Abstract
Disclosed as one embodiment is a method of producing useful articles from ground whole tire waste, which includes the steps of continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into a continuously cooled, open-ended casting chamber.
Claims8
A method of producing useful articles from ground whole tire waste, comprising:
- continuously extruding a heated mixture of ground whole tire waste and thermoplastic binder material into the interior of an elongated, open-ended casting chamber having a cross-section corresponding substantially to the cross-section of the desired useful article wherein the ground whole tire waste comprises rubber and metal debris;
- continuously cooling the exterior surface of the casting chamber to remove sufficient thermal energy from said casting chamber so that a dimensionally stable extrudate emerges from the open end of the casting chamber;
- and
- cutting the emerging extrudate to length
1 more element
A process for making an extruded article comprising the steps of:
- (a) forming a mixture comprising in the range of about 5-95 weight percent thermoplastic, in the range of about 0-20 weight percent reinforcing material and in the range of about 5-95 weight percent rubber particles and metal debris, all based on the total weight of the mixture;
- (b) heating the mixture to a temperature at least above the melting point of the thermoplastic and less than the degradation temperatures of both the thermoplastic and thermoset;
- (c) extruding the mixture through a die having a cross-sectional shape desired of the end product so that the final product will have a shore A hardness of at least about 70;
- and
- (d) cooling the extrudate into the final product.
2 more elements
Dependencies are inferred from the claim text.