Procedure and apparatus for helical cutting of a flexible...

B - Operations – Transporting – 29 – C

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18/1074, 164/53

B29C 67/00 (2006.01) B26D 1/02 (2006.01)

Patent

CA 2019842

Flexible tubular sheet material 10 of polymeric material is supplied to a first position (for instance between rollers 11) in a flat form and is helically cut by blade 18 to form a cut strip that is drawn away by a unit 20. The flat strip is drawn from the first position and is opened to a tubular form and is then drawn over a mandrel 14, where it is cut. Preferably it is hereby inflated by air from a blower 13. The cutting position is fixed. The flat tubular sheet material 10 is provided at the first position from a reel 9 and is discharged from the reel at a discharge zone and is drawn to the mandrel with a screw movement. This movement is established by drawing the sheet from the reel along the axial direction of the reel while the discharge zone is brought to spin around the reel.

Une feuille tubulaire souple aplatie 10 en polymère est acheminée vers un premier point (par exemple entre deux galets 11) où elle est découpée en hélice par une lame 18 pour donner une bande découpée évacuée par tirage par l'élément 20. La bande aplatie est tirée du premier point et ouverte pour lui donner une forme tubulaire avant de l'enfiler sur un mandrin 14 où elle est découpée. De préférence, elle est alors gonflée au moyen d'une soufflante d'air 13. La position de coupe est fixe. La feuille tubulaire aplatie 10 est acheminée au premier point par une zone précise de dévidage d'une bobine 9 puis enfilée sur le mandrin selon un mouvement hélicoïdal. Ce mouvement est amorcé en tirant la feuille le long de l'axe de la bobine et en faisant tourner la zone de dévidage autour de la bobine.

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