Patent ID: 8580364

Claim:
A liner tube configured for placement in a pipe interior for repair of the pipe and configured to be sufficiently flexible to lie substantially flat in a pliable state and to be substantially circular in cross section in an expanded state, the liner tube comprising: an outer layer comprising an absorbent material and a curable material; an inner layer disposed inwardly relative to the outer layer, the inner layer including an impermeable sub-layer comprising a material substantially impermeable to liquids; a first intermediate layer disposed between the inner layer and the outer layer, the first intermediate layer being wrapped around the inner layer to overlap itself and define a first overlap portion in a first circumferential position of the circular cross section when the liner tube is in the expanded state; and a second intermediate layer disposed between the first intermediate layer and the outer layer, the second intermediate layer being wrapped around the first intermediate layer to overlap itself and define a second overlap portion in a second circumferential position of the circular cross section when the liner tube is in the expanded state, the first circumferential position and the second circumferential position being at least 120 degrees apart circumferentially; wherein the first and second intermediate layers are constructed of an absorbent material; and wherein the curable material of the outer layer changes from being in a liquid condition in the pliable state and, in response to curing in the expanded state, to being in a hardened condition.