B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/02 (2006.01) B29C 65/00 (2006.01) B29C 65/20 (2006.01) B29C 65/14 (2006.01)
Patent
CA 2243003
The invention provides a method of welding together articles made of a thermoplastic plastic material by means of a butt welding process, whereby the two articles to be welded together are held in place in coaxial relationship by means of clamping devices. Then, the two articles are heated up by means of a heating device that can be placed between the two articles to create a molten up welding zone in the region of each of the free ends of the two articles. As soon as the welding zone has reached the proper temperature, the two articles to be welded together are pressed together to create a bulge. Finally, the temperature of that bulge is continuously monitored and the temperature of the material in the interior of the afore mentioned welding zone is calculated according to the formula T M(t) = 0~ t(T BT,t)dt until such a temperature is reached at which the articles can be removed from the clamping devices.
Cette invention concerne une méthode de soudage bout à bout d'éléments en matériau thermoplastique, les éléments étant maintenus en parfait alignement coaxial par des dispositifs de serrage. Les éléments sont alors portés à une température appropriée au moyen d'un dispositif chauffant placé entre eux de manière à créer une zone fondue à leur extrémité libre. Dès que la température voulue a été atteinte, les deux articles sont pressés l'un contre l'autre de manière à former un bourrelet au point de contact. Enfin, la température du bourrelet est mesurée en continu et les résultats de la mesure sont utilisés pour déterminer la température intérieure des articles dans la zone de soudage au moyen de la formule T M(t) = 0~ t(T BT,t)dt, température qui doit avoir baissé à un niveau suffisant avant que l'on retire les articles des mécanismes de serrage susmentionnés.
Haug Peter
Wermelinger Jorg
Georg Fischer Rohrleitungssysteme Ag
Oyen Wiggs Green & Mutala Llp
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