Speed camera (printing technology)
Blitzer is one in the printing industry , called unsightly appearance on the printed sheet when there is to see White Paper where it should not be seen.
There are two types of speed cameras. At the cut edge, flashes occur in further processing if the printed sheet is cut imprecisely and the motif should end exactly on the later paper edge. In order to avoid this type of speed camera, a protruding edge bleed / trimmed of the motif is already created in the prepress stage in the layout program , which is cut off during further processing (so-called sloping pressure ). Usually this is 3 to 5 mm. This ensures that no speed cameras occur even with technically required tolerances in further processing.
On the other hand, lightning bolts occur between adjacent, differently colored elements: In the multi-color printing unit, several different colors are successively printed on the sheet of paper. Only a few thousandths of a millimeter are enough to create a speed camera. To counteract this, it is adjacent elements in the layout program overfilling or underfilling ( trapping ).
If a speed camera occurs, this can be a fault of the printer, which is responsible for printing all colors with the same status (see register marks , sheet control elements ) on top of one another. If this is not possible for him, critical moisture levels in the substrate, errors in the printing plate production or printing units in need of overhaul can be the cause of the registration problem .