Inversion liner and liner components for conducts

• US 20030234056A1
• Filed: 04/24/2003
• Published: 12/25/2003
• Est. Priority Date: 06/19/2002
• Status: Active Grant

• Current Assignee: Saint-Gobain Adfors Canada Ltd.
• Original Assignee: Saint-Gobain Technical Fabrics Europe
• Inventors: Tigchelaar, Mark, Pleydon, Robert, Woolstencroft, Jon H.
• Granted Patent: US 6,837,273 B2
• Time in Patent Office: Days
• US Class Current: 138/98
• CPC Class Codes: B29C 63/36 being turned inside out for platic tubes in general B29C67/0018
• CPC Class Codes: B29D 23/001 Pipes; Pipe joints pleated hoses B29D23/18
• CPC Class Codes: B29K 2995/0069 non-permeable
• CPC Class Codes: B29L 2023/006 Flexible liners
• CPC Class Codes: B32B 17/02 in the form of fibres or filaments
• CPC Class Codes: B32B 27/02 in the form of fibres or filaments not used
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: F16L 55/1651 the flexible liner being everted
• CPC Class Codes: F16L 55/1656 materials for flexible liners hoses in general F16L11/00

Abstract

Inversion liners are provided which in a first embodiment include first and second flexible fabric layers joined to first and second glass fiber containing layers and joined in tubular form, whereby 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. This method and liner construction can save one or more steps in the manufacture of glass-reinforced, polyester felt liners

Claims

1. A method of making a tubular inversion liner or liner block, comprising:

a) providing a first flexible fabric layer fastened to a first glass fiber containing layer;

b) providing a second flexible fabric layer fastened to a second glass fiber containing layer;

c) combining said first and second flexible fabric layers and said first and second glass fiber containing layers, whereby said first and second flexible fabric layers face one another and are sandwiched between said first and second glass fiber containing layers; and

d) joining a third flexible fabric layer, having a lesser thickness that either of said first or second flexible fabric layers, to said first or second glass fiber containing layers, and applying a substantially fluid impermeable layer to said third flexible fabric layer, whereby said substantially fluid impermeable layer becomes the outermost layer prior to inversion.

2. The method of claim 1 wherein said third flexible fabric layer is stitched to at least said second glass fiber containing layer.

3. The method of claim 1 wherein said third flexible fabric layer is glued, resin or heat bonded to said second glass fiber containing layer.

4. The method of claim 1 wherein said third flexible fabric layer comprises a nonwoven felt layer.

5. The method of claim 4 wherein said nonwoven felt layer comprises a thickness of about 0.1-1.0 mm.

6. The method of claim 1 wherein said third flexible fabric layer comprises a nonwoven veil having adhered thereon a resinous coating or thin film.

7. The method of claim 6 wherein said veil comprises a needle-punched nonwoven polyester or acrylic felt.

8. The method of claim 1 wherein said substantially fluid impermeable layer comprises a polyurethane or acrylic latex coating, or a melt-bonded polyolefin film, which is applied after said third flexible fabric layer is joined to either said first or second glass fiber containing layer.

9. A tubular inversion liner made in accordance with the method of claim 1.

10. A method of manufacturing a tubular inversion liner or liner block comprising:

a) providing a first flexible nonwoven polyester fabric layer fastened to a first glass fiber containing layer;

b) providing a second flexible nonwoven polyester fabric layer fastened to a second glass fiber containing layer;

c) applying a nonwoven polyester veil to said second glass fiber containing layer,

d) stitching said nonwoven polyester veil, said first and second flexible nonwoven polyester fabric layers and said first and second glass fiber containing layers together, whereby said first and second polyester fabric layers face one another and are sandwiched between said first and second glass fiber containing layers, and said nonwoven polyester veil being stitched to said second glass fiber containing layer; and

e) applying a substantially fluid impermeable layer to said nonwoven polyester veil, said substantially fluid impermeable layer becoming the outer most layer prior to inversion.

11. The method of claim 10 wherein said veil has a thickness of 0.1-1.0 mm.

12. A tubular inversion liner made in accordance with the method of claim 10.

14. The method of claim 10 wherein said substantially fluid impermeable layer comprises a polyurethane or acrylic latex coating, or a melt-bonded polyolefin film.

13. A method of making a tubular inversion liner or liner block, comprising:

a) providing a first flexible fabric layer fastened to a first glass fiber containing layer;

b) providing a second flexible fabric layer fastened to a second glass fiber containing layer;

c) combining said first and second flexible fabric layers and said first and second glass fiber containing layers, whereby said first and second flexible fabric layers face one another, and are sandwiched between said first and second glass fiber containing layers; and

d) joining a substantially fluid impermeable layer onto said second glass fiber containing layer, said substantially fluid impermeable layer becoming the outermost layer prior to inversion.