초록 ▼

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 compo

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.

대표청구항 ▼

What is claimed is: 1. A glass-reinforced inversion liner system configured to be installed into a tubular member using inversion, the liner system, prior to the installation, comprising:a) polyester felt;b) a fiberglass layer adjacent an inner surface of the polyester felt;c) a three-dimensional ma

What is claimed is: 1. A glass-reinforced inversion liner system configured to be installed into a tubular member using inversion, the liner system, prior to the installation, comprising:a) polyester felt;b) a fiberglass layer adjacent an inner surface of the polyester felt;c) a three-dimensional material adjacent an inner surface of the fiberglass layer, the three-dimensional material having a plurality of glass fibers;d) at least one channel extending through the polyester felt into the fiberglass layer;e) resin applied to the polyester felt, wherein a portion of the resin passes through the at least one channel and is delivered to the fiberglass layer;f) a cover adjacent an exterior surface of the felt;g) fiberglass fragments that are chopped and orientated perpendicular to the felt and interconnecting the three-dimensional material, the fiberglass layer, and the felt; andh) an agent for hardening the material in place;wherein,the resin maintains structural integrity when continuously exposed to water and is substantially free of volatile organic compounds;the material is a weave of polyester and ECR fiberglass;the cover is a covering comprised of at least one of nylon blend and PET;the resin is applied with a resin slug and a pinch roller; andthe material has a diamond-shaped weave and protruding barbs.