Talk about the length of the print in front and in the direction of the print is not consistent with the film
September 21 07:01:50, 2024
In the case of ignoring paper deformation, when the plate cylinder diameter (printing plate and liner thickness) is equal to the impression cylinder diameter (plus paper thickness), the size of the imprint on the plate is equal to the size of the imprint on the paper. For the Heidelberg [specialty, product, encyclopedia] printing machine, under normal circumstances, the diameter of the plate cylinder after the lining is fixed (sometimes using a thickness of 0.30mm of the bottom film), so that when the thickness of the printing paper changes, India The size of the print in the forward and backward directions will change. When the diameter of the impression cylinder (plus the thickness of the paper) is different from the diameter of the plate cylinder (the printing plate and the lining), the print on the print will appear with the length of the print on the plate. deviation.
Plate cylinder and impression cylinder rely on gear transmission, so in the printing area, the rotation angle of the two rollers is always equal, if Ri>Rp (Ri: radius of impression cylinder after adding paper; Rp: radius of plate cylinder), The length of the print on the paper is greater than the length of the print on the plate; if Ri
Therefore, when changing the thickness of the paper, the print on the print cannot completely be required to completely coincide with the print on the plate (on the film).
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