Protective cover for a thermoresponsive tube

Claim 1

In a thermoshrinkable tube designed to be wrapped around and to heat-seal pipes to protect the pipes from corrosion, said thermoshrinkable tube having the whole inner wall thereof covered with a protective cover to keep it clean of any foreign matter, the improvement wherein said protective cover located inside said tube has ends projecting beyond the ends of said tube, with said cover ends folded back to the outer wall of the tube at both ends thereof and removably fastened to said outer wall with its ends apart from each other, said protective cover being made of such a material selected from the group consisting of paper and a plastic sheet so that it can be peeled off the tube before the application of heat to the thermoshrinkable tube by unfastening both ends of such protective cover from the outer wall of the tube, fastening one unfastened end of the protective cover to a pipe at a location near the portion of the pipe to be heat-sealed with the thermoshrinkable tube and then moving the thermoshrinkable tube away from the location toward to the portion of the pipe to be sealed so that the protective cover will be turned inside out during and after such movement, thus making it possible to peel off the protective cover from the thermoshrinkable tube just prior to the heat sealing thereof.