Device and method for controlling web tension

摘要

A method for controlling tension in a web of a printing press, the printing press including an infeed, printing units and a folder, the method comprising the steps of increasing an infeed tension in the web between the infeed and the printing units when the printing units change to a printing mode from a white web mode; and decreasing the infeed tension in the web when the printing units change from the printing mode to the white web mode. Also disclosed is a web printing press which includes an infeed for providing a web of material to be printed; at least one printing unit for printing the web, the printing unit having a printing mode and a white web mode; a folder for cutting the web into signatures; and a controller for controlling the tension in the web between the infeed and the printing units and the tension after the printing units, the controller controlling the tension between the infeed and the at least one printing unit as a function of a transition between the printing mode and the white web mode.