A method of joining reinforced thermoplastic pipes

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/00 (2006.01) B29C 65/20 (2006.01) B29C 65/34 (2006.01) F16L 47/03 (2006.01)

Patent

CA 2167212

An electrofusion coupler (14) is slid over one of two thermoplastic pipes (10, 12) each having a layer or layers of reinforced fibres (34) between the centre of the wall of thc pipe and the outside surface (38). The end surfaces are trimmed in a butt fusion machine and the resulting end surfaces (40, 42) are forced against a heater plate. The plate is removed and the end surfaces are forced together. Internal and external beads (50, 52) involving inward and outward flow of material result, the outward flow ensures that there is at the welded joint an inner layer (60) which is free from reinforcement fibres. The external bead (52) is removed and the coupler is slid over the butt fused welded joint and energised to cause it to become fusion welded to the outside of the pipe.

Un dispositif d'accouplement par électrofusion (14) coulisse sur un des deux tuyaux thermoplastiques (10, 12), chacun ayant une couche ou des couches de fibres renforcées (34) situées entre le centre de la paroi du tuyau et la surface externe (38). Les surfaces terminales sont dressées dans une machine de fusion bout-à-bout et les surfaces terminales résultantes (40, 42) sont poussées contre une plaque chauffante. La plaque est retirée et les surfaces terminales sont poussées l'une contre l'autre. L'écoulement interne et externe de la matière entraîne la formation de cordons interne et externe (50, 52). L'écoulement externe assure la formation, au niveau du joint soudé, d'une couche interne (60) qui est dépourvue de fibres de renforcement. On retire le cordon externe (52) et on fait coulisser le dispositif d'accouplement sur le joint soudé par fusion bout-à-bout, et ce dispositif d'accouplement reçoit un courant d'excitation afin que ce cordon externe soit soudé par fusion à la surface externe du tuyau.

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