Method and device for manufacturing biaxially oriented...

B - Operations – Transporting – 29 – C

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Details

B29C 55/26 (2006.01) B29C 47/88 (2006.01) B29C 47/90 (2006.01)

Patent

CA 2185707

A tube is extruded from a thermoplastic material and is then forced over a mandrel at an orientation temperature of the material. The mandrel has an expanding section that expands the tube in its circumferential direction. A tube speed controller upstream of the expanding section of the mandrel exerts an axial force on the tube, and a puller downstream of the mandrel exerts an axial pulling force on the tube. Upstream of the tube speed controller, an outer layer of a wall of the tube is brought to a temperature below the orientation temperature. That outer layer is thick enough to withstand the force exerted by the tube speed controller.

Le procédé consiste à extruder un tube en matière thermoplastique puis à faire passer le tube de force sur un mandrin (6) à une température d'orientation de la matière plastique. Le mandrin comporte une section dilatable (8) provoquant une dilatation du tube dans le sens circonférentiel. Un dispositif (12) de régulation de la vitesse du tube intervient sur le tube en amont de la section dilatable du mandrin afin de soumettre le tube à une force axiale, et un dispositif de traction (20) intervient sur le tube en aval du mandrin (6) afin de soumettre le tube à une force axiale de traction. On porte à une température inférieure à la température d'orientation initiale la matière plastique constitutive d'une couche externe de la paroi du tube, en amont du dispositif (12) de régulation de la vitesse du tube, cette couche étant celle sur laquelle intervient ce dispositif et étant suffisamment épaisse pour résister à la force exercée par ledit dispositif de régulation de la vitesse du tube.

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