Method of preparing cured in place liner using resin impregnation tower
US7238251B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2003 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Aug 17, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1013
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A non-pressurized resin impregnation tower for continuously impregnating the resin impregnable layer of a tubular cured in place liner is provided. The tower is at a height to provide sufficient resin pressure head to impregnate the resin impregnable layer fully. The resin impregnated tube is fed into the top of the tower, drawn down about a roller at the bottom, removed from the top of the tower and then wrapped with an outer impermeable coating. The impregnated liner is suitable for pull-in-and-inflate method of installation or may be everted. For liners formed with an inner impermeable layer, the liner is suitable for curing with steam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.