Treatment of scrap
US4342647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1980 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Nov 26, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S241/37
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Uncured rubber scrap may be segregated from metal and fiber contaminants by the method of first embrittling the scrap by immersion in a liquid cryogen, then impacting the embrittled rubber and magnetically removing metal, and then milling the remainder. Gas flotation is used during milling so that particles of rubber and fiber are selectively removed from the mill and subsequently classified by size, whereby most of the fibrous component is segregated from a remainder. The remainder is then worked so as to increase the surface area of residual fiber prior to further segregation of fiber from rubber by gas flotation. The combined milling and flotation procedure may also be used for separating components of other mixtures. Apparatus for embrittling and milling is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.