Turnback protection for installation of cured in place liners
US6612340B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | May 17, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1651
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Fusion of facing portions of the turnback portion of an installed everted resin impregnated cured in place liner installed in an existing conduit is avoided by adhering a high temperature turnback release film to a portion of the trailing end of the everting liner. After cure and removal of the downstream end of the liner, the high temperature release film is peeled away from the cured liner. This avoids the need to remove the fused portion of the turnback by cutting or excavation of a section of the liner. Fusion generally occurs due to the exotherm from the crosslinking of the thermosetting resin impregnated into the flexible lining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.