Method and installation for making plastic tubes with...

B - Operations – Transporting – 29 – C

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Details

B29C 49/08 (2006.01) B29C 49/14 (2006.01) B29C 49/16 (2006.01) B29C 49/64 (2006.01) B29C 55/26 (2006.01) B29C 57/08 (2006.01) F16L 47/06 (2006.01) F16L 47/08 (2006.01)

Patent

CA 2266538

The invention concerns a method for making plastic tubes, whereby a tube blank (Te) brought to a temperature close to molecular orientation temperature is subjected to a bi-axial drawing, by radial expansion of the tube blank inside a forming shaft (2), with formation of a contraction cavity at one end of the tube, by controlled displacement of this contraction cavity to the other end of the tube, and by longitudinal drawing. The radial expansion is carried out in at least two phases, viz. a first phase during which the tube blank (Te) is inflated to an intermediate diameter (Di) determined by a double-walled envelope (21), introduced into the forming shaft (2), with circulation of a hot fluid between the two walls of the envelope (21), and then the envelope is gradually removed from the forming shaft (2) to enable, during a second phase, the radial expansion of the plastic tube up to an internal diameter of the forming shaft (2), and its longitudinal drawing.

Image Procédé de fabrication de tubes en matière plastique, selon lequel on fait subir un étirage bi-axial à un tube-ébauche (Te) porté à une température voisine de sa température d'orientation moléculaire, par dilatation radiale du tube-ébauche à l'intérieur d'un fût de formage (2), avec formation d'une bulle à une extrémité du tube, déplacement contrôlé de cette bulle jusqu'à l'autre extrémité du tube, et avec étirage longitudinal. La dilatation radiale est réalisée en au moins deux phases, à savoir une première phase au cours de laquelle le tube-ébauche (Te) est gonflé jusqu'à un diamètre intermédiaire (Di) déterminé par une enveloppe (21) à double paroi, introduite dans le fût de formage (2), avec circulation d'un fluide chaud entre les deux parois de l'enveloppe (21), et ensuite l'enveloppe (21) est progressivement sortie du fût de formage (2) pour permettre, au cours d'une deuxième phase, la dilatation radiale du tube en matière plastique jusqu'au diamètre interne du fût de formage (2), et son étirage longitudinal.

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