Sealing of pipe liners
US12251887B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2020 |
| Grant date | Mar 18, 2025 |
| Priority date | — |
| Expiry date | Sep 13, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/34
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method and apparatus of manufacturing a pipe liner for lining the inside of a pipe, for example a water or sewerage pipe requiring repair. The pipe liner is mainly formed of a fabric sleeve, or a plurality of fabric sleeves, and comprises a fluid-proof barrier coating on the inside surface of the pipe liner. The method involves arranging a strip of carrier material comprising a liquid sealant inside the fabric sleeve of the pipe liner and in registration with two opposing side edges of the sheet of fabric, facing an inner barrier coating of the fabric sleeve. The method can advantageously provide such a pipe liner with an inner barrier coating without everting the pipe liner after manufacture. The present invention may provide for avoiding internal cross-welding of pipe liners and a method for testing the integrity of the barrier coating of pipe liners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.