Method and apparatus for cutting across a paper web

Details Method and apparatus for cutting across a paper web Method and apparatus for cutting across a paper web

B - Operations, Transporting

65

H

B65H 35/06 (2006.01) B26D 7/02 (2006.01) B65H 20/32 (2006.01)

Patent

CA 2212234

In the process for cutting across a paper web, the paper web is advanced longitudinally for a predetermined length in relation to a stationary cutting tool between two successive cutting steps and stopped during the cutting step. According to the invention, the paper web is conveyed continuously at constant speed as far as the vicinity of the cutting tool and only the region of the paper web immediately adjacent the cutting tool and lying in front thereof is held during the cutting step. At this stage, during the cutting step, the loop (wave) in the section of the continuously conveyed paper web bulging transversely to the theoretically even direction of advance is stored and the stored section is conveyed after the cutting step to the cutting tool at a speed above the constant speed of advance.

Selon un procédé de refente d'une bande de papier en sens travers, la bande de papier est déplacée d'une longueur prédéterminée dans son sens longitudinal, par rapport à un outil de coupe stationnaire, entre deux étapes de coupe successifs, et est arrêtée pendant l'étape de coupe. Selon l'invention, la bande de papier est acheminée en continu à vitesse constante jusqu'à proximité de l'outil de coupe. Seule la zone de la bande de papier jouxtant immédiatement l'outil de coupe et se trouvant devant ledit outil est maintenue pendant la durée de l'étape de coupe. A cet effet, pendant l'étape de coupe, la section de la bande de papier acheminée à la suite sous forme de boucle (vague) bombée vers l'extérieur transversalement par rapport au sens de défilement théoriquement droit est stockée. Après achèvement de l'étape de coupe, la section stockée est transportée jusqu'à l'outil de coupe à une plus grande vitesse comparativement à la vitesse d'acheminement contante.

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