Abstract: The invention provides that flexible lining tubes for application to underground pipelines and passageways comprise absorbent material which is impregnated with curable synthetic resin which can be cured when the tube is placed on the pipeline or passageway surface so that a rigid pipe within the pipe is formed. The curing of the resin is controlled by filling the curing agent into micropores or microporous particles which are dispersed throughout the resin. The curing agent is only released when the resin is subjected to applied energy such as sonic and/or heat energy. A preferred method is to include CURIE temperature magnetic particles in the resin and to excite (and thus heat) the magnetic particles by applying an alternating high frequency magnetic field. The heat from the magnetic particles opens the microporous particles and causes desorbence of the curing agent and then cure of the resin.

Abstract: Lining tube material including a curable latent resin system for lining underground pipelines and passageways is prepared as a large supply. Measured lengths are taken from the supply as needed by measuring the length (for a particular length of passageway to be lined) followed by curing the resin of the material along a short section between the length and the remainder of the supply, and by cutting through the cured section to sever the length from the remainder of the supply leaving a cured and sealing end portion on said length by which the insertion of the length in the pipeline or passageway can be controlled.