Sizing apparatus

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/90 (2006.01) B29C 47/94 (2006.01)

Patent

CA 2231873

A sizing sleeve for controlling the diameter of plastic tube includes pressurised sizing sleeve portions (10) in which fluid is injected under pressure about the tube circumference to form a lubricating layer. Drainage zones (12) axially separate and isolate adjacent pressurised portions to allow independent temperature and pressure control. Each pressurised portion has flow stabilizing means (28) reducing variations in flow responsive to changes in the lubricating layer pressure. The stabilising means may comprise a high pressure fluid source and high pressure drop constriction means comprising fine apertures (56), which may be formed as grooves milled into end surface of abutting sizing sleeve segments (30).

La présente invention concerne un manchon de calibrage destiné à réguler le diamètre de tubes en matière plastique. Il comprend des tronçons (10) sous pression de manchon de calibrage dans lesquels on injecte un fluide sous pression autour du périmètre du tube pour former une couche lubrifiante. Des zones d'évacuation (12) séparent axialement et isolent les tronçons sous pression voisins pour permettre de réguler la température et la pression de façon indépendante. Chaque tronçon sous pression possède un organe stabilisateur de débit (28) qui réduit les variations du débit en réaction à des variations de la pression de la couche lubrifiante. Cet organe stabilisateur peut comprendre une source de fluide haute pression et un organe d'étranglement de gouttes haute pression comportant de fines ouvertures (56), qui peuvent être réalisées sous la forme de rainures fraisées dans la surface d'extrémité de segments du manchon de calibrage qui sont bout à bout (30).

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