Method to separate and recover resin and steel pipe from resin-coated steel pipe
US5512104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Mar 11, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB08B7/0071
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In order to utilize separately steel pipe and coating resin as recycling resources, resin-coated steel pipe, which is produced by adhering a thermo-plastic coating resin on the surface of steel pipe with an adhesive, is heated by high-frequency induction heating to at least the melting temperature of the coating resin, and the coating resin is scraped off while the inner layer thereof is in a melted condition and the outer layer is in a softened condition. Coating resin and steel pipe can be recovered without the composition thereof being damaged. The scraping of coating resin is complete and efficient and requires only minimal energy since it occurs when the inner layer of the coating resin is in a melted condition and the outer layer is in a softened condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.