Overprint is not allowed
1. Overprint is not allowed due to improper operation.
Excessive amount of water will deform the paper and try to reduce the amount of water.
Due to the high printing pressure, the paper slides in the row of teeth, so the printing pressure should be reduced.
The gripper of the paper is too small. Adjust the rules and adjust the gripper again.
The printing plate is incorrectly adjusted or installed, and the position of the printing plate needs to be corrected.
2. The offset printing machine has been running for a long time, and the accuracy is reduced, which leads to inaccurate overprinting.
The swinging roller jacket of the delivery tooth is worn, and the bearing jacket needs to be replaced.
The open tooth bearing of the delivery tooth is worn out, and the open tooth bearing needs to be replaced.
The thrust bearing of the drum is worn, and the thrust bearing is required.
The opening and closing tooth bearing of the drum is damaged, and the bearing needs to be replaced.
The gripper is worn and the gripping paper is difficult, and the gripper needs to be replaced or repaired.
3. The overprinting caused by incorrect installation and adjustment of offset printing machine is not accurate.
When the position between the roller and the roller is not correct, overprinting will occur and need to be adjusted again.
The delivery cam is not installed properly, and the cam position needs to be adjusted again.
The stopper adjustment of the delivery tooth is incorrect, and the stopper needs to be adjusted again.
The gripping force is too small, you need to increase the gripping force of the gripper.
Ink stick failure
1. Ink and ink bar due to the reduction in accuracy of the offset press itself.
The sleeve of the roller is seriously worn, which causes the ink bar to be replaced.
The long-term running error of the paper feeding cam increases and the cam needs to be replaced.
The accuracy of the gears deteriorates after a long period of wear, resulting in ink sticks, and the gears need to be replaced.
2. Ink bar due to improper adjustment of offset press installation.
The printing pressure is too high, causing the ink bar to be lowered.
The position of the ink skew roller is not correct, and the ink ram is generated, so the ink skew roller needs to be recalibrated.
If the pressure of the inking roller is too high, the pressure of the inking roller will cause the ink bar, and the pressure balance of the inking roller and the inking roller needs to be adjusted.
Discussion on the above issues
The first two parts introduce some of the more common solutions to the problem of inaccurate overprinting and ink bar, just the tip of the iceberg, because there are too many reasons for this type of problem, and it is impossible to give an example. Whether it can be solved really depends on the maintenance engineer. Skills, experience and problem-solving skills.
The overprinting of the offset printing machine and the ink bar are the most serious faults in production, and are also problems that are difficult for general maintenance personnel to solve. If such faults are serious and cannot be resolved, the use value of the offset press will be seriously weakened and the quality of the product will be affected Will reduce production efficiency, reduce corporate profits, and lose potential customers.
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