Method of processing scrap roof-membrane sheet material comprising a flexible synthetic fabric substrate enveloped in a thermoplastic plastic envelope
US5145617A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1990 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Oct 15, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/917
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.