Method and apparatus for enhancing seam uniformity in...

B - Operations – Transporting – 31 – C

Patent

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Details

B31C 3/00 (2006.01) B29C 53/60 (2006.01) B29C 53/62 (2006.01) B29C 53/82 (2006.01) B29C 65/48 (2006.01)

Patent

CA 2262875

The invention provides a method and apparatus for spirally winding a tube of enhanced spiral seam uniformity that is simple and reliable. The spirally wound tube (10) is formed using a spiral pitch control surface that engages with an exterior or interior cylindrical surface of a spirally wound tube and constrains movement of the tube to a predetermined spiral rotation as it is formed on a cylindrical stationary mandrel (12). Preferably, the pitch control surface comprises a tube engaging surface (14) positioned along at least one spirally aligned portion of the exterior portion of the tube forming mandrel.

Procédé et appareil destinés à enrouler en spirale un tube dont le joint hélicoïdal présente une uniformité accrue et qui est simple et fiable. Ce tube enroulé en spirale (10) est formé au moyen d'une surface de commande des pas de la spirale qui entre en contact avec une surface cylindrique externe ou interne d'un tube enroulé en spirale et limite le mouvement du tube à une rotation en spirale prédéterminée tandis que le tube est formé sur un mandrin cylindrique fixe (12). De préférence, la surface de commande de pas comprend une surface (14) entrant en contact avec le tube, qui est positionnée le long d'au moins une partie alignée de manière hélicoïdale de la partie extérieure du mandrin de formage du tube.

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