Patent ID: 6837273
Filing Date: 2005-01-04
Classification: B29C,B29D,B29K,B29L,B32B,F16L

Abstract:
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 by melt bonding or adhesion without stitching or needling, 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 than either of said first or second flexible fabric layers, to said first or second glass fiber containing layers, and directly 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.