In the case of ignoring paper deformation, when the plate cylinder diameter (plus plate and liner thickness) is equal to the impression cylinder diameter (plus paper thickness), the print size on the plate is equal to the print size on the paper. For Heidelberg printing presses, the diameter of the plate cylinder after lining is generally fixed (sometimes 0.30mm thick bottom film is sometimes used), so that when the thickness of the printing paper changes, the print size of the front and back of the printed product will be Changes occur, when the diameter of the impression cylinder (plus the thickness of the paper) and the diameter of the plate cylinder (plus the printing plate and the liner) are different, the imprint on the printed product will deviate from the imprint length on the printing plate. The plate cylinder and the impression cylinder are driven by gears. Therefore, in the printing area, the rotation angle of the two cylinders is always equal. If Ri> Rp (Ri: radius of the impression cylinder after adding paper; Rp: radius of the plate cylinder), The length of the blot on the paper is greater than the length of the blot on the printing plate; if Ri Therefore, when changing the thickness of the paper, the marks on the printed product and the printing plate (on the film) should not be required to coincide exactly.
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