Cured-In-Place Liner Material And Methods and Systems for Manufacture

摘要

A liner tube for repairing existing pipes is provided. The liner tube is sufficiently flexible to lie substantially flat under its own weight thereby defining an upper portion and a lower portion. The liner tube includes an inner layer, an outer layer disposed around the inner layer, 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 the upper portion, 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 the lower portion. The first and second intermediate layers include a porous material and the inner layer includes material substantially impermeable to liquids.

主权项

1. 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 comprising:
an outer layer comprising an absorbent material and a curable material, wherein the outer layer is translucent to visible light and impermeable to light in at least a portion of the ultraviolet spectrum; 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; at least 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 at least 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 state.