Method and apparatus for unwinding a roll of web material

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 23/04 (2006.01)

Patent

CA 2527409

An apparatus and method for unwinding a roll (10) of web material (11) are disclosed herein. The web material (12) is unwound from the roll (10) and the machine direction of motion of the web is altered without creating a problematic span of web material. A value analogous to the tension of the web material is determined. The speed of the web is adjusted according to the analog of the tension of the web. The apparatus can comprise an unwind stand (100) to rotate the roll, and a means for altering the direction of travel of the web material. The apparatus further comprises a means to determine an analog of the web material tension and a means of controlling the speed of the web according to the analog of the web tension. The web material is routed to a downstream process.

Cette invention concerne un dispositif et un procédé applicables au dévidage d'un rouleau (10) de matériau en voile (11). Ce matériau (12) est dévidé du rouleau (10) et le sens d'avance de la machine est modifié sans qu'il en résulte une tension problématique du matériau en voile. On détermine une valeur analogue à la tension du matériau en voile. Le dispositif peut comporter un poste de dévidage (100) faisant tourner le rouleau, et des moyens permettant de modifier le sens de déplacement du matériau en voile. Le dispositif comprend en outre des moyens permettant de déterminer une valeur analogue à la tension du matériau en voile et des moyens de limitation de la vitesse en fonction de cette valeur analogue à la tension du voile. Le matériau en voile est acheminé vers l'aval pour traitement.

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