Method for covering a pipe or cable with heat- shrinkable...

Details Method for covering a pipe or cable with heat- shrinkable... Method for covering a pipe or cable with heat- shrinkable...

B - Operations, Transporting

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B29C 61/06 (2006.01) B29C 61/10 (2006.01) B29C 65/34 (2006.01) B29C 65/50 (2006.01) B29C 65/68 (2006.01) F16L 47/03 (2006.01) H02G 15/18 (2006.01)

Patent

CA 1184105

ABSTRACT OF THE DISCLOSURE 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 the operations of (a) maintaining for a period of shorter than about 20 minutes such a high voltage V1 that the electric power consumption W1 per unit area of the covering material is 0.75 to 1.5 watt/cm2, (b) changing the high voltage V1 to a middle voltage V2 which provides an electric power consumption W2, per unit are of the covering material, of (0.6 to 0.9) x W1 watt/cm2 and (c) maintaining the middle voltage V2 until the surface of the adhesive layer reaches the adhesion temperature and then interrupting the application of electricity, whereby the covering material is shrunk and bonded to the joint portion.

389770

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