Duro-Last, Inc.

Harry Hermanson

Robert C Hultz

David R Grussing

A method of processing scrap, single-ply synthetic plastic roof-membrane sheet material comprising a fabric, having warp and weft strands composed of bundles of synthetic plastic fibers, encased in a thermoplastic synthetic plastic envelope. Comminuted pieces of the scrap are stuffed into a heat-applying, continuous mixer-extruder having screw mechanism within an elongate barrel chamber and the compressed material then is heated to plasticizing temperature and subjected to repetitive shear forces as it moves along the barrel chamber to a die discharge. The warp strands are separated from the weft strands via said shear force application and disembodied via said shear forces to provide discrete fibers in the mix of material. Finally, the fibers are randomly dispersed in the mix material and extruded.

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Caseville, MI, United States of America

Harry Hermanson