Patent ID: 7955456

Claim:
A method for printing a blister film web in a packaging machine, in which molded blister shells are closed with blister film, which comprises the steps of: supplying the blister film web to a sealing apparatus via a first transport system; supplying the molded blister shells to the sealing apparatus via a second transport system; detecting a position of one of the molded blister shells, the detecting taking place in a correlated manner, the correlated manner being in anti-phase in relation to a periodic operation of the sealing apparatus for avoiding influences interfering with detection and reduction of precision; generating a trigger signal for a printing device in dependence on a detection; applying optical information to the blister film web via the printing device at a position along the blister film web which is disposed upstream of the sealing apparatus; and generating at least one detection signal in at least one time interval between action time intervals of the sealing apparatus for closing the molded blister shells.