1. Overprinting is not allowed
1. Overprint is not allowed due to improper operation.
(1) Excessive amount of water will deform the paper, and try to reduce the amount of water.
(2) Due to the high printing pressure, the paper slides in the row of teeth, so the printing pressure should be reduced.
(3) The gripper of the paper is too small. Adjust the rules and adjust the gripper again.
(4) The printing plate is adjusted or installed incorrectly, and the printing plate position needs to be recalibrated.
2. The offset printing machine has been running for a long time, and the accuracy is reduced, which leads to inaccurate overprinting.
(1) The wobbling roller jacket of the delivery paper tooth is worn, and the bearing jacket needs to be replaced.
(2) The open tooth bearing of the paper tooth is worn, and the open tooth bearing needs to be replaced.
(3) The thrust bearing of the drum is worn, and the thrust bearing is required.
(4) The bearing of the opening and closing tooth of the drum is damaged, and the bearing needs to be replaced.
(5) The gripper is worn, and the gripper is difficult. It is necessary to replace or repair the gripper.
3. The overprinting caused by incorrect installation and adjustment of offset printing machine is not accurate.
(1) When the position between the roller and the roller is not correct, overprinting will occur and need to be adjusted again.
(2) The installation of the delivery tooth cam is inappropriate, and the cam position needs to be adjusted again.
(3) The adjustment of the stopper of the delivery tooth is incorrect, and the stopper needs to be adjusted again.
(4) The gripping force is too small, it is necessary to increase the gripping force of the gripper.
Second, the ink bar failure
1. Ink and ink bar due to the reduction in accuracy of the offset press itself.
(1) The sleeve of the roller sleeve is seriously worn, which causes the ink bar to be replaced.
(2) The long-term running error of the paper delivery cam increases and the cam needs to be replaced.
(3) The accuracy of the gears deteriorates over a long period of time, resulting in ink sticks. The gears need to be replaced.
2. Ink bar due to improper adjustment of offset press installation.
(1) The ink pressure is too high due to the printing pressure, and the pressure needs to be adjusted down.
(2) The position of the ink skew roller is incorrect, and the ink skewer is generated, so the ink skew roller needs to be recalibrated.
(3) The pressure of the inking roller is too large, and the pressure of the inking roller will cause the ink bar. The pressure balance of the inking roller and the inking roller needs to be adjusted.
3. 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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