B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 51/26 (2006.01) B29C 47/88 (2006.01) B29C 47/90 (2006.01) B29C 55/26 (2006.01) B65H 51/14 (2006.01)
Patent
CA 2185708
Method and devices for manufacturing biaxially oriented tubing from thermoplastic material. The method comprises forcing the tube over a mandrel (4) at an orientation temperature of the plastic material, which mandrel (4) comprises an expansion part (6) which produces expansion in the circumferential direction of the tube. The forcing over the mandrel is achieved by exerting a pushing force on the tube upstream of the expansion part of the mandrel by means of pushing means (12) acting upon the outside of the tube, and by exerting a pulling force on the tube downstream of the mandrel. The pushing means (12) act upon the tube at a distance upstream of the mandrel, and the tube is supported between the place where said pushing means act and the expansion part of the mandrel.
Procédé et dispositif de fabrication d'un tube à orientation biaxiale à partir d'une matière thermoplastique. Le procédé consiste à faire passer le tube sur un mandrin (4) à une température d'orientation de la matière plastique, ledit mandrin (4) comportant une pièce de dilatation (6) provoquant une dilatation du tube dans le sens circonférentiel. On fait passer le tube sur le mandrin en soumettant le tube à un effort de poussée en amont de la pièce de dilatation du mandrin, au moyen d'un ensemble pousseur (12) venant au contact de la face extérieure du tube, et en le soumettant à un effort de traction en aval du mandrin. L'ensemble pousseur (12) vient au contact du tube à une certaine distance en amont du mandrin, et le tube est soutenu entre la zone de contact avec ledit ensemble pousseur et la pièce de dilatation du mandrin.
Prenger Jan Hendrik
Schuurman Johan
Visscher Jan
Gowling Lafleur Henderson Llp
Wavin B.v.
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