A packaging machine which unwinds a bottom film web from a supply roll and conveys it intermittently or continuously along the packaging machine and in a forming station, forms into the bottom film web packaging cavities, which are then filled with a product to be packaged. In a sealing station, a top film web is sealed to the bottom film web, wherein the bottom and top film web are respectively unwound from a supply roll and the bottom and top film web are respectively tensioned by means of a dancer roll. The supply roll is driven by means of a motor, the parameters of which, in particular rotation speed and/or torque, can be set on the basis of the parameters of the respective supply roll.