초록 ▼

A water impervious heat shrinkable rubber or plastic tube wherein a laminated metal foil layer consisting of a metal foil film having a thickness of 0.01 mm to 0.1 mm and, laminated on each surface thereof, an electrically insulating or semiconducting rubber or plastic sheet extends along the entire

A water impervious heat shrinkable rubber or plastic tube wherein a laminated metal foil layer consisting of a metal foil film having a thickness of 0.01 mm to 0.1 mm and, laminated on each surface thereof, an electrically insulating or semiconducting rubber or plastic sheet extends along the entire or partial length of the tube and over the entire periphery of the tube, the two longitudinal edges of the laminated metal foil layer overlapping in a predetermined width and the laminated metal foil layer being so arranged in the tube that the thickness of the inner tube layer inside the laminated metal foil layer is smaller than the thickness of the outer tube layer outside the laminated metal foil layer.

대표청구항 ▼

1. A water impervious heat recoverable rubber or plastic tube comprising: an inner and outer layer forming a tube, each layer having a thickness in the radial direction of the tube and each layer comprising a heat shrinkable plastic or rubber; a laminated metal foil layer interposed between said

1. A water impervious heat recoverable rubber or plastic tube comprising: an inner and outer layer forming a tube, each layer having a thickness in the radial direction of the tube and each layer comprising a heat shrinkable plastic or rubber; a laminated metal foil layer interposed between said inner and outer layers, the thickness of said inner layer being less than the thickness of the outer layer over the complete extent of the portion of the tube containing said laminated foil layer, said laminated metal foil layer having two longitudinal edges and comprising a metal foil film having a thickness of 0.01 mm to 0.1 mm and, an electrically insulating or semiconducting rubber or plastic sheet laminated on each surface of said metal foil film, said laminated metal foil layer extending up to the entire length of said tube and extending within said tube over more than 360° in the circumferential direction of said tube, the complete longitudinal extent of the two longitudinal edges of said laminated metal foil layer overlapping each other in said circumferential direction over a predetermined distance in said circumferential direction. 2. The tube according to claim 1, further comprising an insulating or semiconducting adhesive layer on up to the entire surface of said inner layer. 3. The tube according to claim 2, wherein said tube comprises opposed end regions, said adhesive layer being on the inner surface of said inner layer except at said opposed end regions of said tube. 4. The tube according to claim 2, wherein said tube comprises a central region and opposed end regions each having a predetermined length, said adhesive layer being on the inner surface of said inner layer except at said opposed end regions and said central region of said tube. 5. The tube according to claim 1, wherein said heat shrinkable rubber or plastic is selected from the group consisting of polyethylene, polyvinyl chloride, saturated polyester, cross-linked polyethylene, ethylene-propylene rubber, silicone rubber, chloroprene rubber, and fluoroplastic. 6. The tube according to claim 1, wherein said inner and outer layer comprises a semiconducting rubber or plastic. 7. The tube according to claim 1, wherein said tube has a shrinking rate of at least 20% along the peripheral direction thereof with respect to the original dimensions thereof. 8. The tube according to claim 1, wherein said inner layer comprises a semiconducting rubber or plastic and said outer layer comprises an electrically insulating rubber or plastic. 9. The tube according to claim 8, wherein the rubber or plastic of said electrically insulating or semiconducting rubber or plastic sheet is selected from the group consisting of high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene, polybutene-1, polymethylpentene, an ethylene-ethylacrylate copolymer, an ethylene-vinylacetate-vinyl chloride graft copolymer, chlorinated polyethylene isoprene rubber, chloroprene rubber and styrene-butadiene rubber. 10. The tube according to claim 1, wherein said metal foil film in said tube comprises a member selected from the group consisting of a copper foil film, an aluminum foil film, and a lead foil film. 11. The tube according to claim 10, wherein said metal foil film is a lead foil film. 12. The tube according to claim 1, wherein a predetermined length of one of said two longitudinal edges of said metal foil layer is exposed on the inner surface of said tube. 13. The tube according to claim 1, wherein the rubber or plastic of said electrically insulating or semiconducting rubber or plastic sheet is selected from the group consisting of high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene, polybutene-1, polymethylpentene, an ethylene-ethylacrylate copolymer, an ethylene-vinylacetate-vinyl chloride graft copolymer, chlorinated polyethylene isoprene rubber, chloroprene rubber and styrene-butadiene rubber. 14. The tube according to claim 1 wherein said sheet contains carbon black. 15. The tube of claim 1, wherein overlapping longitudinal edge portions of said metal foil layer are spaced from each other in the radial direction of said tube. 16. The tube of claim 1 wherein said laminated metal foil layer extends over the entire length of said tube. 17. A water impervious heat recoverable rubber or plastic comprising: an inner and outer layer forming a tube, each layer having a thickness in the radial direction of the tube and each layer comprising a heat shrinkable plastic or rubber selected from the group consisting of polyethylene, polyvinyl chloride, saturated polyester, cross-linked polyethylene, ethylene-propylene rubber, silicone rubber, chloroprene rubber, and fluoroplastic; a laminated foil layer interposed between said inner and outer layers, the thickness of the inner layer being less than the thickness of the outer layer over the complete extent of the portion of the tube containing said laminated foil layer, said laminated foil layer having two longitudinal edges and comprising a metal foil film having a thickness of 0.01 mm to 0.1 mm and being selected from the group consisting of a copper foil film, an aluminum foil film and a lead foil film, and an electrically insulating or semiconducting rubber or plastic sheet laminated on each surface of said metal foil film, wherein the rubber or plastic is selected from the group consisting of high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene polybutene-1, polymethylpentene, an ethylene-ethylacrylate copolymer, an ethylenevinylacetate-vinyl chloride graft copolymer, chlorinated polyethylene, isoprene rubber, chloroprene rubber and styrene-butadiene rubber, said laminated metal foil layer extending up to the entire length of said tube and extending within said tube over more than 360° in the circumferential direction, the complete longitudinal extent of the two longitudinal edges of said laminated metal foil layer overlapping each other in said circumferential direction over a predetermined distance in said circumferential direction. 18. The tube according to claim 17, further comprising an insulating or semiconducting adhesive layer is formed on up to the entire inner surface of said inner layer. 19. The tube according to claim 18, wherein said tube comprises opposed end regions, said adhesive layer being on the inner surface of said inner layer except at said opposed end regions of said tube. 20. The tube according to claim 18, wherein said tube comprises a central region and opposed end regions each having a predetermined length, said adhesive layer being on the inner surface of said inner layer except at said opposed end regions and said central region of said tube. 21. The tube according to claim 17, wherein said tube has a shrinking rate of at least 20% along the peripheral direction thereof with respect to the original dimensions thereof. 22. The tube according to claim 17, wherein said inner layer comprises a semiconducting rubber or plastic and said outer layer comprises an electrically insulating rubber or plastic. 23. The tube according to claim 17, wherein said metal foil film is a lead foil film. 24. The tube of claim 17, wherein overlapping longitudinal edge portions of said metal foil layer are spaced from each other in the radial direction of said tube. 25. The tube of claim 17 wherein said laminated metal foil layer extends over the entire length of said tube.