Inversion liner and liner components for conduits
AssigneeSaint-Gobain Technical Fabrics Canada, Ltd.
InventorsRobert Pleydon, Mark Tigchelaar, Jon H. Woolstencroft
Life of this patent
Estimating the term…
Abstract
Inversion liners are provided which in a first embodiment include first and second flexible fabric layers joined to first and second high strength fiber containing layers and joined in tubular form. The first and second flexible fabric layers face one another. The second glass fiber containing layer further is bonded to a thin, third flexible fabric layer. A substantially fluid impermeable layer is applied to the opposite side of the thin, third flexible fabric layer.
Claims36
A method of making a tubular inversion liner or liner block, comprising:
- a) providing a first flexible fabric layer stitched to a first high strength fiber containing layer;
- b) providing a second flexible fabric layer stitched to a second high strength fiber containing layer;
- c) combining said first and second flexible fabric layers and said first and second high strength fiber containing layers by melt bonding or adhesion without stitching or needling the first and second flexible fabric layers to each other, whereby said first and second flexible fabric layers face one another, and are sandwiched between said first and second high strength fiber containing layers;
- and
- d) providing a substantially fluid impermeable layer on said second high strength fiber containing layer to form a tubular inversion liner having a total thickness of about 12 to 50 mm.
A method of making a tubular inversion liner or liner block, comprising:
- a) providing a first flexible fabric layer stitched to a first high strength fiber containing layer;
- b) providing a second flexible fabric layer stitched to a second high strength fiber containing layer, the second high strength fiber containing layer including chopped fibers and rovings;
- c) combining said first and second flexible fabric layers and said first and second high strength fiber containing layers by melt bonding or adhesion without stitching or needling the first and second flexible fabric layers to each other, whereby said first and second flexible fabric layers face one another, and are sandwiched between said first and second high strength fiber containing layers;
- d) joining a veil to the second high strength fiber containing layer, the veil being thinner than the first and second flexible fabric layers;
- e) providing a substantially fluid impermeable layer on said veil, wherein said fluid impermeable layer comprises a polymer film directly bonded to the veil.
A pressure-expandable tubular liner for conduits, including at least one liner block, comprising:
- a first flexible fabric layer stitched to a first high strength fiber containing layer;
- a second flexible fabric layer stitched to a second high strength fiber containing layer;
- said first and second flexible fabric layers and said first and second high strength fiber containing layers fastened together by melt bonding or adhesion without stitching or needling the first and second flexible fabric layers to each other, whereby said first and second flexible fabric layers face one another and are sandwiched between said first and second fiber containing layers;
- and
- a substantially fluid impermeable layer joined to at least one of said high strength fiber containing layers to form a tubular inversion liner having a total thickness of about 12 to 50 mm.
A pressure-expandable tubular liner for conduits, comprising:
- a first flexible fabric layer stitched to a first high strength fiber containing layer;
- a second flexible fabric layer stitched to a second high strength fiber containing layer;
- one or more additional flexible fabric layers, each of the additional flexible fabric layers joined to one of the group consisting of the first flexible fabric layer, the second flexible fabric layer, and another of the one or more additional flexible fabric layers by melt bonding or adhesion without stitching or needling the first and second flexible fabric layers to each other, whereby said one or more additional flexible fabric layers are sandwiched between said first and second high strength fiber containing layers;
- and
- a substantially fluid impermeable layer joined to at least one of said first and second high strength fiber containing layers to form a tubular inversion liner having a total thickness of about 12 to 50 mm.
Dependencies are inferred from the claim text.