Troubleshooting of commercial rotary printing

Case 1: There are ink particles and paper wool on the printed matter

1. Failure phenomenon:

When printing stamps with one color, there are ink particles and paper hairs with a diameter ranging from 0.5mm to 2mm on the arc line of the stamp.

After inspection, the ink and paper powder on the blanket and the printing plate are thick, and the white edge of the paper powder is serious at the position corresponding to the paper edge of the blanket. The preliminary judgment was caused by loose paper. After scrubbing the blanket and the printing plate, the machine speed printing was slowed down. The problem was not completely solved. The same problem reappeared about an hour later. So the main reason for judgment is ink. Using an ink knife to draw out the ink tank and found that the ink flow is very poor, so add 0 # ink adjustment oil leveling (about 30%), restart the machine, the problem no longer exists.

2. Reasons for failure:

After a long time of printing, the ink in the ink tank has poor fluidity and high viscosity, which makes the ink easy to be granulated and easy to adhere to the paper powder.

3. Matters needing attention:

The machine must print the ink fountain frequently for long-term printing, and add the appropriate amount of additives to improve the performance of the ink if necessary.

Case 2: Extra ink lines appear on the printed product

1. Failure phenomenon:

An extra ink line appeared in the form when printing the bill.

The inspection found that the ink line does not appear at the gripping position of the printing plate, excluding the gripping and blanket factors; the whole version of the graphic is clear, there are no other stains, and the dirty version is excluded; checking the ink, the ink roller is seriously accumulating ink, and the ink volume is initially judged Big. So wash the printing plate and blanket, close the ink roller and print again, the ink line appears again after a few minutes. Wash the ink, reapply less ink, slightly reduce the amount of fountain solution, and then turn on the machine to solve the problem.

2. Reasons for failure:

The amount of ink on the inking roller is too large, and the pressure on the printing plate is heavy when inking. A thicker ink line is punched on the plate surface. Although the fountain solution has washed off part of the ink, it cannot completely wash off the firmly adhered ink line.

3. Matters needing attention:

It is advisable to use a small amount of ink and water when applying ink to the rotary machine. Don't avoid heavy ink and water at the beginning, causing serious emulsification of ink and other failures.

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