Control method for the manufacture of oriented plastics tubes

Details Control method for the manufacture of oriented plastics tubes Control method for the manufacture of oriented plastics tubes

B - Operations, Transporting

29

C

B29C 55/22 (2006.01) B29C 47/90 (2006.01) B29C 47/92 (2006.01) B29C 55/24 (2006.01)

Patent

CA 2229752

A method of expanding a tube of plastics material is disclosed in which a longitudinally travelling tube (10) is progressively diametrically expanded by internal fluid pressure in an expansion zone (20) between an upstream plug (24) and an expandable downstream plug (26). Expansion of the tube is controlled in response to parameters which directly or indirectly indicate variation in the relative velocity at which material is delivered to and removed from the expansion zone, such as detecting upstream tube velocity (38), early expansion diameter (36), axial force (39) on a sizing device (28) or the tube diameter (41) just before the expansion zone.

L'invention porte sur un procédé de dilatation de tubes plastiques, selon lequel un tube (10) se déplaçant dans le sens longitudinal subit un élargissement diamétral progressif sous l'effet d'un fluide sous pression dans une zone de dilatation (20) comprise entre un bouchon aval (24), et un bouchon amont dilatable (26). La dilatation du tube est régulée en fonction de paramètres indiquant directement ou indirectement les variations de la vitesse (38) relative d'entrée et de sortie du tube de la zone de dilatation, tels que la vitesse du tube en amont (38), le diamètre en début de dilatation (36), la force axiale (39) s'exerçant sur le dispositif de calibrage (28) ou le diamètre (41) du tube immédiatement avant la zone de dilatation.

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