Method and apparatus for incrementally stretching a web

B - Operations – Transporting – 29 – C

Patent

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B29C 55/18 (2006.01)

Patent

CA 2679486

A method and apparatus is provided which uses activation members for incrementally stretching a web at a low strain rate. The activation members include an activation belt (114) and a single activation member (112) wherein the activation belt and single activation member comprise a plurality of teeth (124) and grooves (126) that complement and engage one another at a depth of engagement in a deformation zone (120). The depth of engagement can be controlled to increase linearly over at least a portion of the deformation zone such that a web (116) interposed between the activation belt and the single activation member in the deformation zone is incrementally stretched at a low rate of strain.

L'invention concerne un procédé et un appareil qui utilisent des éléments d'activation pour étirer graduellement une bande et la soumettre à un taux de déformation faible. Les éléments d'activation comprennent une courroie d'activation (114) et un élément d'activation unique (112) pourvus d'une pluralité de dents (124) et de rainures (126) qui se complètent et viennent en prise les uns avec les autres à une profondeur de mise en prise comprise dans la zone de déformation (120). La profondeur de mise en prise peut être commandée pour augmenter de façon linéaire sur au moins une partie de la zone de déformation, de sorte qu'une bande (116) interposée entre la courroie d'activation et l'élément d'activation unique (112) dans la zone de déformation est étirée de façon graduelle et soumise à un faible taux de déformation.

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