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Inversion liners are provided which in a first embodiment include first and second flexible fabric layers separated by one or more glass fiber containing layers and joined in tubular form. The second flexible fabric layer further is bonded to a third flexible fabric layer comprising a substantially

Inversion liners are provided which in a first embodiment include first and second flexible fabric layers separated by one or more glass fiber containing layers and joined in tubular form. The second flexible fabric layer further is bonded to a third flexible fabric layer comprising a substantially fluid impermeable layer. An invertible glass-faced liner is also provided by this invention which includes a glass facing on one side and a substantially fluid impermeable layer on the other. The substantially fluid impermeable layer is joined to a flexible fabric layer which is preferably heat bonded to a thin veil joined to a second glass containing layer of this liner embodiment. The inversion liners of this invention can be built-up in multiple layers or blocks to meet end-use design demands while still providing flexural moduli in excess of 500 ksi, preferably about 700-800 ksi.

대표청구항 ▼

What is claimed: 1. A tubular inversion liner for conduits, including at least one liner block, comprising: (a) first flexible fabric layer fastened to a first glass fiber containing layer; (b) a second flexible fabric layer fastened to a second glass fiber containing layer; (c) said first and se

What is claimed: 1. A tubular inversion liner for conduits, including at least one liner block, comprising: (a) first flexible fabric layer fastened to a first glass fiber containing layer; (b) a second flexible fabric layer fastened to a second glass fiber containing layer; (c) said first and second flexible fabric layers and said first and second glass fiber containing layers fastened together whereby said first and second glass fiber containing layers face one another and are sandwiched between said first and second flexible fabric layers; (d) a third flexible fabric layer comprising a substantially fluid impermeable layer joined thereto, said third flexible fabric layer joined to said second flexible fabric layer by melt boding or adhesion without stitching or needling, so that the first flexible fabric layer becomes the innermost layer of said inversion liner prior to inversion. 2. The tubular inversion liner of claim 1 wherein said first, second or third flexible fabric layers comprise a felt, and said first and second glass fiber layers comprise chopped glass fibers and glass roving. 3. The tubular inversion liner of claim 1 wherein said substantially fluid impermeable layer comprises a resinous membrane or coating. 4. The tubular inversion liner of claim 3 wherein said resinous coating comprises a polyurethane coating which is adhered to a first surface portion of said third flexible fabric layer. 5. The tubular inversion liner of claim 1 wherein said first and second flexible fabric layers comprise a polyester needled felt, and said first and second glass fiber containing layers are sewn or stitched thereto. 6. The tubular inversion liner of claim 1 wherein said liner is impregnated with a heat-curable resin, and cured to produce a flexural modulus of at least about 500 ksi. 7. The tubular inversion liner of claim 6 including a second liner block bonded to said first flexible fabric layer, said second liner block comprising a third and a fourth glass fiber containing layer sandwiched between a second and a third flexible fabric layer, said at least one liner block sewn, heat, flame or adhesive bonded to said second liner block prior to inversion. 8. The tubular inversion liner of claim 1 having an inversion rate which is at least 10% faster than the inversion rate for a 100% polyester felt liner of like dimensions. 9. The tubular inversion liner of claim 1, wherein the first and second glass fiber containing layers include glass rovings provided in a machine direction, a cross-maching direction, or both. 10. The tubular inversion liner of claim 1, wherein the first and second glass fiber containing layers include glass rovings provided in a machine direction. 11. A method of lining a conduit, comprising: (a) providing a tubular inversion liner comprising a first flexible fabric layer fastened to a first glass fiber containing layer; a second flexibl fabric layer fastened to a second glass fiber containing layer; said first and second flexible fabric layers and said first and second glass fiber containing layers fastened together whereby said first and second glass fiber containing layers face one another and are sandwiched between said first and second flexible fabric layers; a third flexible fabric layer comprising a substantially fluid impermeable layer joined thereo, said third flexible fabric layer joined to said second flexible fabric layer by melt bonding or adhesion without stitching or needling, so that said first flexible fabric layer becomes the innermost layer of said tubular inversion line prior to inversion; and a heat-activatable or light-activatable resinous saturant disposed within one or more of the first, second and third flexible fabric layers; (b) inserting said inversion liner into a conduit by an inversion process wherein said fluid impermeable layer becomes the innermost layer after the inversion process; (c) heat-activating or light-activating said heat-activatable or light-activatable resinous saturant to cure same. 12. The method of claim 11 wherein said insertion step (b) comprises employing a pressurized fluid to invert the inversion liner and expand it into close proximity with an inner wall of said conduit. 13. The method of claim 12, wherein said pressurized fluid is left in contact with said inversion liner until said resinous saturant is cured. 14. The method of claim 11 wherein said heat-activatable or light-activatable resinous saturant comprises a polyurethane, polyester, vinyl ester, or epoxy. 15. The method of claim 11, wherein step (b) is performed using an inversion rate which is at least 10 % faster than inverting 100 % polyester felt liner of like dimensions. said first and second glass fiber layers comprise chopped glass fibers and glass roving. 16. A tubular inversion liner for conduits, comprising: a first flexible layer containing a polyester felt stitched to a first plurality of glass fibers; a second flexible layer containing a polyester felt stitched to a second plurality of glass fibers; said first and second flexible fabric layers and said first and second plurality of glass fibers stitched together whereby said first and second plurality of glass fibers face one another and are sandwiched between first and second flexible fabric layers; and a third flexible fabric layer containing a polyester felt and first and second opposing surfaces thereon, said first of said surfaces bonded to said second flexible fabric layers by melt bonding or adhesion without stitching or needling, and said second surface provided with a substantially fluid impermeable resinous material. 17. The inversion liner of claim 16 wherein said plurality of glass fibers comprises chopped glass fibers and glass roving. 18. The inversion liner of claim 16 wherein sai first and second pluralities of glass fibers comprise a thickness of less than about 5 mm. 19. An invertible glass-faced liner, comprising: a first glass fiber containing layer; a first flexible fabric layer fastened to said first glass fiber containing layer; a second flexible fabric layer disposed over said first flexible fabric layer; a second glass fiber containing layer disposed over said second flexible layer and fastened thereto; a third fabric layer disposed over said second glass fiber containing layer and fastened thereto, said third flexible fabric layer being thinner than said first or second flexible fabric layers while still permittingmelt bonding thereto; a fourth flexible fabric layer disposed over said third flexible fabric layer and bonded thereto my melt bonding or adhesion without stitching or needling; and a substantially fluid impermeable layer joined to said fourth flexible fabric layer, said substantially fluid impermeable layer becoming the innermost layer of said inversion liner after inversion. 20. The glass-faced inversion liner of claim 19 wherein said liner is at least partially impregnated with a heat curable or light curable resin and cured to form a composite having a flexural modulus of at least about 700-800 ksi. 21. The glass-faced inversion liner of claim 19 wherein said third flexible fabric layer comprises a first veil or first thin felt having a thickness of less than 1 mm. 22. The glass-faced inversion liner of claim 21 wherein said third and fourth flexible fabric layers and said substantially fluid impermeable layer have a total thickness of less than 2.0 mm. 23. The glass-faced inversion liner of claim 21, further comprising a second veil or second thin felt having a thickness of less than 1 mm bonded to said first glass fiber containing layer. 24. A tubular inversion liner for conduits comprising: (a) a pair of liner blocks, each block having first and second flexible fabric layers and a glass-containing layer sandwiched therebetween, said flexible fabric layers containing flame bondable fibers; (b) further flexible fabri disposed between said pair of liner blocks and melt or adhesive bonded thereto without stitching or needling; (c) a thin veil or felt having an impermeable layer heat or adhesively bonded to a first surface of a first one of said pair of liner blocks without stitching or needling; (d) wherein said glass-containing layers are disposed within about 2.5 mm from an exterior surface portion of said liner. 25. The tubular inversion liner of claim 24, wherein the pair of liner blocks and the further flexible fabric build up to a thickness of about 25 mm to 44 mm. 26. The tubular inversiion liner of claim 24, wherein at least one of the group consisting of the pair of liner blocks and the further flexible fabric has a thickness of about 14 mm. 27. A method for fabricating a tubular inversion liner for conduits, comprising the steps of: (a) providing a pair of liner blocks, each block having first and second flexible fabric layers and a glass-containing layer sandwiched therebetween, said flexible fabric layers conataining fame bondable fibers; (b) bonding a thin veil or felt having an impermeable layer at least to a first surface of a first one of said pair of liner blocks using heat or adhesion, without needling or stitching; (c) tacking further flexible fabric or at least one further liner block between said pair of liner blocks using heat or adhesion, without needling or stitching either of the pair of liner blocks to the further fabric or further liner block or to each other. 28. The method of claim 27, wherein the pair of liner blocks and the further liner block or flexible build up to a thickness of about 25 mm to 44 mm.