A Heidelberg Speedmaster CD102V four-color offset printing machine often has ghosting failures that sometimes occur during printing, which seriously affects the quality and production progress of the product. Judging and checking based on work experience, the author believes that the ghosting failure occurred in the second color group. The teeth, pressure and water volume of the color group were carefully checked, but no problems were found. Then remove each gripper spring of the impression cylinder, lift up the gripper plate and touch carefully to check. As a result, it was found that the small rubber pad of a gripper plate on the side of the body was degummed and cracked, and the gripper just hit the crack when gripping the paper, making the gripper unable to grip the paper normally, causing occasional ghosting failure. After removing the pad, the ghost phenomenon disappeared immediately.
In fact, it is a special design of Heidelberg to stick a special rubber pad to the gripper plate. The purpose is to ensure that the gripper has sufficient gripping force, avoid hard wear of the gripper plate and the pad, extend the service life of the machine, and ensure good printing. Delivery and overprinting. However, in actual operation, especially during daily cleaning and maintenance, you should be careful not to use cleaning fluid with strong volatility, and the amount of cleaning fluid should not be excessive, so as to avoid corrosion damage to the teeth and reduce the accuracy of the machine's overprint.
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