Analysis and troubleshooting of ghosting caused by

Analysis and troubleshooting of ghosting caused by the teeth of the embossing cylinder

1 The force of the press cylinder in its teeth and paper is too small, resulting in a full ghosting of the printing sheet. When J2205 offset printing machine is printing two-color products, most of the printed matter is almost blank; On the other hand, China's industry has developed rapidly in recent years, and there are double shadow faults. After inspection, it was found that it was caused by the too small force of the embossing cylinder in its teeth and paper. During printing, the imprinting drum holds the paper in its teeth. Due to the imprinting force of the rubber drum, the paper ejection failure (unable to hold the paper) occurs in its teeth, which makes the whole paper move wrongly, causing a full ghosting of the print

Troubleshooting: pad 0.25mm thick paper at the brake of the teeth of the imprint drum, and then loosen all the fixing screws of the teeth, so that the teeth are against the tooth pad, and take it out after adjustment

2. The transfer time between the teeth of the embossing cylinder and the teeth of the swing is not enough, resulting in a full ghosting of the print.

a split two-color single-sided offset press has a full ghosting failure of the print in the process of printing two-color products. In the process of inspection, we found that the handover time between the swinging gripper and the embossing gripper was too short, that is, the paper delivery gripper had not completely gripped the paper, and the embossing cylinder gripper opened the teeth, so the paper staggered during the handover process, and a full double image was formed on the print after printing

elimination: for the double image caused by the improper connection of two sets of teeth, the opening and closing cam of the teeth of the imprint cylinder should be adjusted. Specifically, according to the handover time between the teeth of the paper delivery and the teeth of the imprint cylinder, when the teeth of the paper delivery hold the paper, after 1 ~ 1.5 time, the teeth of the imprint cylinder will open and release the paper. At this time, the teeth opening cam should drive the teeth opening swing rod to open the teeth of the imprint cylinder, which can be divided into the following three categories:

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