Joining polyolefinic members by fusion

Details Joining polyolefinic members by fusion Joining polyolefinic members by fusion

B - Operations, Transporting

29

C

18/972

B29C 65/10 (2006.01) B29C 65/00 (2006.01) B29C 65/02 (2006.01) B29C 65/20 (2006.01) B29C 65/50 (2006.01) B29C 65/52 (2006.01) B29C 65/14 (2006.01)

Patent

CA 1307090

ABSTRACT JOINING POLYOLEFINIC MEMBERS BY FUSION First and second members (e.g. pipes, fittings) of cross-linked polyolefinic material such as polyethylene having a melt flow index (MFI) of zero are joined using a third member of polyolefinic material such as polyethylene having a higher MFI e.g. 0.3. The first member 10 and the third member gripped by clamps 18, 20 of a butt fusion machine are pressed against opposite faces of a heater plate which is then withdrawn and the members are pressed together by the clamps. Only the third member is upset to form beads 24, 26. Part of the third member is removed leaving a stub part 16. The second member is joined to the stub's face 36 using the heater plate. The part 16 is upset leaving a thin wafer 48. The two interfaces 30, 50 limit the growth of cracks in the wafer to prevent their propagation through the pipe thickness under hoop stress. The beads are preferably removed at each stage.

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