B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/14 (2006.01) B29C 63/00 (2006.01) B29C 63/10 (2006.01) F16L 58/10 (2006.01) B29C 35/08 (2006.01) B29C 63/14 (2006.01) B29C 65/16 (2006.01)
Patent
CA 2136223
2136223 9422661 PCTABS00033 A pipe (10) of polyethylene is reinforced by two layers (12, 14) of polyethylene tape wound around the pipe in opposite directions under tension. The pipe contains carbon black and the layers are unpigmented and free from fillers and are transparent to infra-red radiation to which the first major surface (21) is exposed. The radiation is in the near infra-red region and has a substantial part of the radiant energy of a wavelength of less than 2.5 micrometers. Very little radiation is absorbed by the layers but a very high absorption occurs in the outer surface of the pipe. This causes the interface between the second major surface (36) of the layer (12) and the first major surface (38) of the pipe and between the second major surface (28) of the layer (14) and the first major surface (30) of the layer (12) to reach temperatures at which fusion welding in the layers welds them together and welds the layer (12) and the pipe (10) together.
Gowling Lafleur Henderson Llp
Lattice Intellectual Property Ltd.
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