Method of forming a welded joint between polyolefinic members

Details Method of forming a welded joint between polyolefinic members Method of forming a welded joint between polyolefinic members

1992-04-24

1994-03-22

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 86, 1562744, 156293, 156294, 156296, 1563042, 1563096, 264230, 285156, 285909, B29C 6514

Patent

active

052960730

ABSTRACT:
A polyethylene pipe 10 is joined by a welded joint to a cross-linked polyethylene coupler 14 which has been expanded to make the coupler heat recoverable. Radiant energy (eg light in the visible spectrum or infra-red light) illuminates the outer surface of the coupler 14 supplied by an array of 15OW reflector lamps 20. The coupler 14 shrinks and is forced into engagement with the pipe 10 and the pipe 12 to join the pipes. A fusion welded joint is formed between the coupler 14 and each pipe, 10, 12. In an alternative a pipe is drawn down and inserted in an aperture through the wall of another pipe. A lamp is inserted in the drawn down pipe and the radiant energy causes the pipe to expand into engagement with the edge of the aperture and to be joined to it by a welded joint (FIG. 2).

REFERENCES:
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patent: 4036514 (1977-07-01), Hannover
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patent: 4419304 (1988-12-01), Ficke et al.
patent: 4521041 (1985-06-01), Cox et al.
patent: 4636272 (1987-01-01), Riggs
Patent Abstracts of Japan, "Molding body", vol. 14, No. 69, Feb. 8, 1990 (Kuraray Co. Ltd.).

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