Troubleshoot a ghosting failure

A Roland 702 offset printing machine of the company has been used for 5 years, generally printing 90-250g /? Coated paper and cardboard. Once found that there is a ghosting failure on the drive side of the printed product during printing, immediately shut down, and check various influencing factors according to experience:

(1) Is the blanket aging? Since there is no ghost image on the operation side of the printed product, the cause of the aging of the blanket can be ruled out.

(2) Are the rubber roller linings of different thickness? After updating the package, the fault still exists, indicating that the problem is not here.

(3) Is the printing pressure balanced? After inspection, the printing pressure is consistent.

(4) Is the pressure on the water roller and ink roller normal? After inspection, the pressure of each water plate and ink roller is normal, and the ink is normal.

(5) Is the gripper loose? After inspection, adjustment, and trial printing, it was found that there were no ghosting problems in the first few sheets. The ghosting phenomenon began only after the 10th sheet, and it was light and shallow, indicating that the problem was not on the gripper.

(6) Are the front and side regulations normal? Checking the needle position, it was found that there was a needle position jump in the previous picture, so we suspect that it is the problem of the pre-regulation. But after inspection, the front and side regulations are also normal.

Finally, it was found that the platen roller on the drive side near the front gauge was too loose. After adjustment, the ghosting fault was removed.

Author: Wang Jianming Zhejiang Ideal Group

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