Method and installation for treating plastic tubes with...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 55/26 (2006.01) B29B 13/04 (2006.01) B29C 31/00 (2006.01) B29C 35/16 (2006.01)

Patent

CA 2266386

The invention concerns a method for treating plastic tubes, in particular PVC tubes, obtained by extrusion, whereby a tube is brought to a molecular orientation temperature, higher than room temperature, and is subjected to a bi-axial drawing by radial expansion and axial elongation, to obtain a bi-oriented tube whose mechanical properties are improved. The tube (T) is cut into elements (4) of predetermined length immediately after being extruded and its temperature is higher than the molecular orientation temperature, each element constituting a blank (5); each blank (5) is placed in a chamber (E) to be cooled therein by a fluid (F) to a temperature close to the molecular orientation temperature, the dwell time of the blank in the chamber being greater than the time of its production by extrusion; and the blank (5) is then extracted from the chamber (E) to be subjected to a treatment enabling its bi-orientation.

Procédé de traitement de tubes en matière plastique, notamment en PVC, obtenus par extrusion, selon lequel on porte un tube à une température d'orientation moléculaire, supérieure à la température ambiante, et on lui fait subir un étirage bi-axial par dilatation radiale et par allongement axial, pour obtenir un tube à bi-orientation dont les propriétés mécaniques sont améliorées. Le tube (T) est coupé en éléments (4) de longueur déterminée alors qu'il vient d'être extrudé et que sa température est supérieure à la température d'orientation moléculaire, chaque élément constituant une ébauche (5); chaque ébauche (5) est placée dans une enceinte (E) pour y être refroidie par un fluide (F) à une température voisine de la température d'orientation moléculaire, le temps de séjour de l'ébauche dans l'enceinte étant supérieur au temps de production de l'ébauche par extrusion; et l'ébauche (5) est ensuite extraite de l'enceinte (E) pour subir le traitement assurant une bi-orientation.

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