Patent ID: 7459205

Claim:
A helically wound conduit, said conduit having a helically wound wall, said wall comprising; a ribbon, the ribbon comprising: at least one substrate having a substrate width and a longitudinal axis: an adhesive on said substrate; and a non-woven, non-knitted reinforcing net, said reinforcing net comprising, at least two separated, substantially parallel continuous longitudinally extending spreader yarns, said spreader yarns defining a longitudinally extending plane; having a spreader width and said substrate width is slightly larger than said spreader width and said spreader yarns extend longitudinally adjacent the edges of said substrate, a plurality of continuous weft yarns extending at an angle to said spreader yarns and extending across one side of said plane around one of said spreader yarns and across said plane on the other side of said plane to the other spreader yarn and around said other spreader yarn; and wherein said reinforcing net is affixed to said substrate, and wherein said ribbon is wound with its longitudinal axis following a helix to form said helically wound wall, said helically wound wall constituting the inner surface of said conduit.