A process for producing oriented plastic tube

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/90 (2006.01) B29C 55/00 (2006.01) B29C 55/24 (2006.01) B29C 55/26 (2006.01)

Patent

CA 2702787

A start-up sequence for a continuous process for producing oriented plastic tube is disclosed. A variable diameter extruder (112) is started and is set to extrude a start-up diameter tube (220) which is significantly over the diameter of a pre-expansion tube diameter of the continuous process. The start-up diameter tube (220) is passed to and engaged by a first haul-off tractor (122). The start-up diameter tube (220) proceeds through to and over an upstream plug (128). The large, start-up diameter of the extruded tube (220) at start-up facilitates passage of the leading end of the start-up diameter tube (220) over a deflated, expandable portion (212) or a non-expandable portion (210) of a partly expandable plug (210, 212), depending on the arrangement of the expandable portion (212) and non-expandable portion (210). The tube is then reduced in diameter for the continuous process of diametral ex-pansion and circumferential orientation to occur.

L'invention concerne une séquence de démarrage d'un procédé de production continu d'un tube en plastique orienté. Une extrudeuse de diamètre variable (112) est mise en marche et configurée de manière à extruder un tube de diamètre de démarrage (220) dont le diamètre est considérablement supérieur à celui d'un tube de pré-expansion du procédé continu. Le tube de diamètre de démarrage (220) est mis en prise et coopère avec un premier tracteur (122). Le tube de diamètre de démarrage (220) traverse et dépasse un bouchon amont (128). Le diamètre de démarrage important du tube extrudé (220) au démarrage facilite le passage de l'extrémité avant du tube de diamètre de démarrage (220) dans une partie expansible dégonflée (212) ou une partie non expansible (210) d'un bouchon partiellement expansible (210, 212), en fonction de l'agencement de la partie expansible (212) et de la partie non expansible (210). Le diamètre du tube est ensuite réduit pour permettre le procédé continu d'expansion diamétrale et d'orientation circonférentielle.

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