EP0052476A1
Expired / Lapsed
EP
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Covering method
Assignee: Ube Corp
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Filing: 1981-11-11
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Granted: —
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Expires: 2001-11-11
Abstract
Abstract A method for covering a joint portion of a pipe, a cable or the like with a covering material is provided. A covering material comprising a heat-shrinkable material having a heating conductor wire embedded therein and a heat-fusible adhesive layer on the inner surface of the heat-shrinkable material is placed so that the covering material is wound to form a cylinder around the periphery of the joint portion. Then, electricity is supplied in at least two stages of high and middle voltages to the heating conductor wire through a controller capable of continuously performing different operations. If the middle voltage until the surface of the adhesive layer reaches the adhesion temperature and then interrupting the application of electricity, the covering material is shrunk and bonded to the joint portion.
Inventors
- 👤 Iwao C/O Chiba-Sekiyukagakukojo Tsurutani
- 👤 Hideto C/O Chiba-Sekiyukagakukojo Kataoka
- 👤 Shinichi C/O Chiba-Sekiyukagakukojo Taoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:46
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3428; B29C61/00; B29C61/06; B29C61/0608; B29C61/0625; B29C61/10; B29C65/3472; B29C65/3476; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/50; B29C65/5042; B29C65/66; B29C65/68; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/12; B29C66/124; B29C66/1248; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5342; B29C66/53421; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/914; B29C66/9141; B29C66/91411; B29C66/9161; B29C66/91641; B29C66/91643; B29C66/91645; B29C66/91651; B29C66/91653; B29C66/919; B29C66/94; B29C66/949; F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/1806; H02G15/1813; B29C65/3444; B29C65/3452; B29C65/3468; B29C66/70; B29C66/71; B29C66/96; B29C66/961
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
225 words
A method for covering a joint portion of a pipe or a cable with a covering material, which comprises the steps of: (i) disposing a covering material comprising a heat-shrinkable material having a heating conductor wire embedded therein and a heat-fusible adhesive layer on the inner surface of said heat-shrinkable material, so that the covering material is wound to form a cylinder around the periphery of said joint portion; and then (ii) supplying electricity in at least two stages of high and middle voltages to the conductor wire of the covering material through a controller capable of continuously peforming the operations of (a) maintaining for a period of shorter than about 20 minutes such a high voltage V 1 that the electric power consumption W 1 per unit area of the covering material is in the range of from 0.75 to 1.5 watt/cm 2 , (b) changing the high voltage V to a middle voltage V 2 which provides an electric power consumption W 2 , per unit area of the covering material, of (0.6 to 0.9) x W watt/cm 2 and (c) maintaing said middle voltage V 2 until the surface of the adhesive layer reaches an adhesion temperature of the adhesive and then interrupting the application of electricity, whereby the covering material is shrunk and bonded to the periphery of the joint portion.
Claim 2
Independent Claim
225 words
A method for covering a joint portion of a pipe or a cable with a covering material, which comprises the steps of: (i) disposing a covering material comprising a heat-shrinkable material having a heating conductor wire embedded therein and a heat-fusible adhesive layer on the inner surface of said heat-shrinkable material, so that the covering material is wound to form a cylinder around the periphery of said joint portion; and then (ii) supplying electricity in at least two stages of high and middle voltages to the conductor wire of the covering material through a controller capable of continuously peforming the operations of (a) maintaining for a period of shorter than about 20 minutes such a high voltage V 1 that the electric power consumption W 1 per unit area of the covering material is in the range of from 0.75 to 1.5 watt/cm 2 , (b) changing the high voltage V to a middle voltage V 2 which provides an electric power consumption W 2 , per unit area of the covering material, of (0.6 to 0.9) x W watt/cm 2 and (c) maintaing said middle voltage V 2 until the surface of the adhesive layer reaches an adhesion temperature of the adhesive and then interrupting the application of electricity, whereby the covering material is shrunk and bonded to the periphery of the joint portion.
Claim 3
Dependent Claim
53 words
A method according to claim 1 wherein the heating conductor wire is embedded and arranged in the covering material so that the electrical power consumption per unit area of the covering material is in the range of from 0.4 to 2 watt/cm 2 under a voltage of about 50 to about 500 volts.
Claim 4
Dependent Claim
39 words
A method according to claim 2 wherein the electrical power consumption per unit area of the covering material is in the range of from 0.45 to 1.8 watt/cm 2 under a voltage of about 50 to about 500 volts.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the high voltage V is maintained for about 1 to 15 minutes.
Claim 6
Dependent Claim
41 words
A method according to claim 1 or 4 wherein the high voltage V 1 is such that the electric power consumption W 1 per unit area of the covering material is in the range of from 0.8 to 1.4 watt/cm .
Claim 7
Dependent Claim
40 words
A method according to claim 1 wherein the middle voltage V 2 is such that an electric power consumption W 2 , per unit area of the covering material, of (0.7 to 0.85) x W 1 watt/cm 2 is provided.
Claim 8
Dependent Claim
59 words
A method according to claim 1 wherein, prior to the maintainance of the high voltage V 1 , an initial voltage V such that the electric power consumption W a per unit are of the covering material is (0.4 to 0.6) x W 1 watt/cm 2 is maintained for about 0.5 to 10 minutes to pre-heat the covering material.
Claim 9
Dependent Claim
88 words
A method according to claim 1 wherein said covering material comprises a heat-shrinkable material in the form of a sheet having two branched tongue-like portions on each of both the ends in the direction of thermal shrinkage, and the heating conductor wire is embedded in the body portion of said sheet, in the front tongue-like portion on one end of said sheet and in the back tongue-like portion on the other end of the sheet in a zigzag manner such that thermal shrinkage of the entire sheet permitted.
Claim 10
Dependent Claim
67 words
A method according to claim 8 wherein the heating conductor wire in the body portion of the sheet is independent from the heating conductor wires in the branched tongue-like portions, so that the application of electricity and interruption of the application of electricity to the heating conductor wires in the branched tongue-like portions can be carried out independently from the heating conductor wire in the body portion.
Claim 11
Dependent Claim
32 words
A method according to claim 1 or 8 wherein the 'covering material has a thickness of from 1 to 6 mm and a degree of thermal shrinkage of from 20 to 80%..
Claim 12
Dependent Claim
38 words
A method according to claim 1 or 8 wherein the heat shrinkable material is a thermoplastic synthetic resin cross-linked to such an extent that the degree of gel fraction is in the range of from 20 to 70%.
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