| 摘要 |
PROBLEM TO BE SOLVED: To prevent falling of a molten hot-melt adhesive by forming both ends of a sealer layer of an adhesive, and forming a portion therebetween of the hot-melt adhesive. SOLUTION: Adhesive layers 3 are provided on both ends of an inner surface of a heat shrinkable tube 1 obtained by forming an energizing type heating wire 2 in a zigzag manner on an overall periphery of the tube of a crosslinked polyethylene tube having a glue fraction of 30 to 80%, and bringing a direction of a zigzag parallel portion into coincidence with an axial direction of the tube. A hot-melt adhesive layer 4 is provided between the layers, and a width of the layer 4 is set to a size capable of positioning an anticorrosive layer end of an outer surface of a welded portion of an outer surface anticorrosive metal tube at a sufficient distance to an inside of the end of the layer 4. Thus, falling of the layer 4 can be prevented, and uniformity of the thickness of the layer 4 can be sufficiently held.
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