Method and device for length measurement of packaging webs

摘要

The present invention concerns a method and a device for absolute measurement of a print repeat length and/or at least one package length of a moving packaging web ( 1 ) in line with a printing machine. Normally the print repeat length and one package length are measured and analysed simultaneously. The measurements are made by means of a number of CCD-cameras ( 2, 3, 4 ) connected to a computer ( 6 ) by means of a frame grabber ( 7 ).