Method and device for manufacturing biaxially oriented...

B - Operations – Transporting – 29 – C

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B29C 55/26 (2006.01) B29C 47/90 (2006.01) B29C 55/30 (2006.01)

Patent

CA 2185703

Method and device for manufacturing biaxially oriented tubing from thermoplastic material. The method comprises forcing the tube over a mandrel (6) at an orientation temperature of the plastic material, which mandrel comprises an expansion part (8) which produces expansion in the circumferential direction of the tube, and downstream of the mandrel the exertion of an axial pulling force on the tube, in the course of which the tube encounters a resistance which counteracts the movement of the tube over the mandrel. The method also comprises the exertion of an influence sector-wise in an adjustable manner in the circumferential direction of the tube on the resistance which counteracts the movement of the tube over the mandrel. In an advantageous embodiment the temperature of the plastic material of the tube is influenced sector-wise (20) in an adjustable manner, viewed in the circumferential direction of the tube. The measures according to the invention lead to better control over the manufacture of biaxially oriented tubing.

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 (6) à une température d'orientation de la matière plastique, ledit mandrin comportant une pièce de dilatation (8) provoquant une dilatation du tube dans le sens circonférentiel, et à soumettre le tube à un effort axial de traction en aval du mandrin, de manière que le tube rencontre une résistance qui s'oppose au déplacement du tube sur le mandrin. Le procédé consiste également à influer par secteurs, de manière réglable et dans le sens circonférentiel du tube, sur la résistance qui s'oppose au déplacement du tube sur le mandrin. Selon un mode avantageux de réalisation, on influe par secteurs (20) et de manière réglable sur la température de la matière plastique constitutive du tube, et ce dans le sens circonférentiel du tube. Ces mesures assurent un meilleur contrôle de la fabrication du tube à orientation biaxiale.

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