Pipe and tube rehabilitation liners and corresponding resins

Details Pipe and tube rehabilitation liners and corresponding resins Pipe and tube rehabilitation liners and corresponding resins

B - Operations, Transporting

32

B

B32B 17/04 (2006.01) B29C 70/08 (2006.01) B32B 1/08 (2006.01) B32B 27/12 (2006.01) C08J 5/04 (2006.01) F16L 55/163 (2006.01)

Patent

CA 2630074

A material composition and method for making flexible inversion liners having glass fibers added for strength is disclosed. The liner combines a first layer of polyester felt, an open-faced knit of fabric from ECR glass and PET strands, glass fibers, and a second layer of polyester felt. These components are needle-punched together into essentially a single composite mat, or substrate, using standard needle-punching machinery. The liner is then formed into a tube preferably through a butt joint and prayer stitch covered with a urethane tape. A coating or foil is placed on the outside (prior to inversion) of the liner that is then impregnated with a resin. The resin can have low levels of volatile organic compounds, and can be thermosetting or UV-curable. The liner is then installed in a pipe through an inversion technique using, e.g., either air or water, and cured with UV radiation, steam, or hot water.

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