In a web processing device, a marking head is disposed so as to oppose an X-ray
film which is trained about a print roller which is at an upstream side of slitting
blades. Within a scanning range of a laser beam of a marking head, two printing
regions are disposed with a non-printing region therebetween. The non-printing
region is disposed so as to oppose a cutting line which is cut by the slitting
blades. Before cutting the X-ray film, the web processing device forms marking
patterns on both sides of the cutting line.
