Method of joining plastics pipes by heat fusion

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/72 (2006.01) B29C 55/24 (2006.01) B29C 57/00 (2006.01) B29C 61/04 (2006.01) B29C 61/06 (2006.01) B29C 63/00 (2006.01) B29C 63/42 (2006.01) B29C 63/46 (2006.01) B29C 65/00 (2006.01) B29C 65/36 (2006.01) B29C 65/66 (2006.01) B29C 65/68 (2006.01) F16L 47/02 (2006.01) F16L 47/03 (2006.01)

Patent

CA 2319389

A method of joining a first plastics pipe (1) formed from a first plastics material in which: the first plastics pipe (1), at least at a first end (2) thereof is rendered heat expandable, a ferromagnetic heating element (5) is positioned around the heat expandable first pipe end (2), the heat expandable first pipe end (2) is heated in order to expand the pipe end (2) into contact with the ferromagnetic heating element (5) and the first pipe end (2) and the ferromagnetic heating element (5) are brought into joining relationship with the second pipe end, sleeve (3), or fitting formed from a second plastics material and fused thereto by energising the ferromagnetic heating element (5) by induction heating, the ferromagnetic heating element (5) having a Curie temperature equal to or greater than the crystalline melting point or softening point of the second plastics material of the second pipe end, sleeve (3) or fitting.

L'invention porte sur un procédé d'assemblage d'un premier tuyau (1) en plastique formé dans une première matière plastique, procédé selon lequel ce premier tuyau (1) en plastique, au moins au niveau d'une première extrémité (2), devient extensible sous l'effet de la chaleur. Un élément (5) chauffant ferromagnétique est placé autour de la première extrémité (2) du tuyau extensible sous l'effet de la chaleur, extrémité (2) qui est chauffée de façon à se dilater et à venir en contact avec l'élément (5) chauffant ferromagnétique. La première extrémité (2) du tuyau et l'élément (5) chauffant ferromagnétique sont assemblés par fusion à la seconde extrémité du tuyau, à un manchon (3) ou un raccord formé dans une seconde matière plastique sous l'action de l'élément (5) chauffant ferromagnétique par chauffage par induction. L'élément (5) chauffant ferromagnétique a une température de Curie égale ou supérieure au point de fusion cristallin ou point de ramollissement de la seconde matière plastique formant la seconde extrémité du tuyau, du manchon (3) ou du raccord.

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