Process for separating heterogeneous plastic material into homogeneous fractions and apparatus useful to this purpose
US5246115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Aug 1, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process is taught for separating heterogeneous plastic material into homogeneous fractions, which comprises: PA1 a. feeding the plastic material in a triturated form to a first water-containing separation tank to separate the high specific weight products from the low specific weight products; PA1 b. recovering the mixture of high specific weight products from the bottom of said first separation tank and drying them in a first drier; PA1 c. treating the resulting mixture with a chemical agent capable of swelling/modifying the plastic materials which are sensible to said chemical agent; and PA1 d. drying the products so treated and feeding them to a second separation tank, in which the nonswollen/nonmodified plastic material precipitates while the remaining material, maintained on the surface, is discharged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.