A METHOD FOR PRINTING A WEB OF PACKAGING MATERIAL AND AN APPARATUS THEREOF

A method (500) for printing a web (102) of packaging material for packages (112) holding liquid food products is provided. The web (102) comprises a number of blanks placed after one another, wherein each blank corresponds to one package, wherein each of the blanks comprises a first area (302, 402) that is pre-printed and a second area (304, 404) to be printed. The method comprises receiving (502) the web (102) of packaging material, identifying (504) a first register mark (306, 406) using a first sensor (204), determining (506) a first register mark position based on the first register mark (306, 406), determining (508) a second register mark position area based on the first register mark position, identifying (510) a second register mark (308, 408) within the second register mark position area using a second sensor (208) and determining a second register mark position for the second register mark, determining (512) a second area position of the second area based on the second register mark position, adjusting (514) the web in relation to printer bars (210) in accordance with the second area position, determining (512) a second area position of the second area (304, 404) based on the second register mark position, and printing (516) the second area (304, 404) by using the printer bars (210).