Excluding sticky phenomenon in offset printing

Viscous dirty is that the upper and lower two sheets are stuck together. The essential reason for sticky dirt is that the ink is not completely dry. Therefore, how to make the printed sheets fast dry is the fundamental measure to solve the sticky dirt. There are several ways to eliminate the sticky phenomenon in offset printing:

1. Use quick-drying ink. Especially for multi-color printing, the quick-drying properties of the ink are particularly important. If you find that the ink is drying too slowly, add a small amount of desiccant.

2. Use a dampening treatment with a pH close to 7. The smaller the pH value, the longer the drying time of the ink. The concentration of the fountain solution should be reduced.

3. Increase the amount of dusting. The larger the amount of dusting, the greater the area separating the printed sheets, allowing the ink to have a sufficiently long drying time.

4. Ensure proper temperature. At a higher temperature, the ink oxidizes the conjunctiva faster.

5. Improve ventilation performance. The better the ventilation, the faster the ink will dry. However, it should be noted that this cannot be done for semi-finished products. In addition, the ventilation facilitates heat dissipation due to the heat generated when the ink oxidizes the conjunctiva.

6. The suction volume of the brake roller should not be too large. A certain amount of air should be present between the printed sheets to prevent partial vacuum of the sheets.

7. The printed sheets should not be piled up too high. Too high due to the weight of the paper may cause the underlying paper to stick together

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