Process for manufacturing finished and semi-finished products from mixtures of various synthetic resin scrap materials
US4250222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1975 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Dec 29, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2992
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process is disclosed for manufacturing finished and semi-finished articles from mixtures of normally incompatible synthetic resin scrap materials. The process comprises coarsely grinding thermoplastic scrap materials containing two or more mutually incompatible thermoplastic resins and possibly up to 25 parts % by weight of foreign materials, incorporating into the coarsely ground thermoplastic resin mixture through the application of heat, pressure, or a sequential or simultaneous application of heat and pressure, from about 5 to about 25 parts by weight of a fibrous material, the individual fibers in said fibrous material having an average length equal to at least three times the average size of the fragments constituting the coarsely ground thermoplastic resin mixture, and finally, forming the resin/fiber mass into finished or semi-finished article employing known and conventional techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.