The common problems and countermeasures of pearlescent powder in gravure printing

1. There is no pearl effect in the printed matter 2. The reason that pinholes and small bubbles appear on the printing surface appear bubbles or pinholes on the printing surface. First, there may be moisture or particles in the diluting agent; second, dilute agent is used to adjust the pearlescent light. When the powder must allow the pearl powder to stir evenly before printing on the machine, if not stir evenly, there is powder group in the dilute agent. Such powder group will break and fall off after the printing is dried to form a very small pinhole phenomenon.

The Causes and Countermeasures of Printed Products without Pearlescent Effect

Cause and Countermeasure
1. The poor compatibility of pearl powder and diluting agent: change the diluting agent
2. Diffuse agent dilute: change dilute agent
3. Unbalanced Print: Replacement of Printed Materials
4. Roll engraving is too shallow: re-engraved roll
5. Dilution too big: reduce dilution

6. If you have added a large amount of pearl powder, but the printing surface pearl effect is still not enough, the problem may appear on the version roll, because the depth of the roll is not enough, the version roll is too shallow, only the fine pearl powder transferred and left Under the coarser particles, the result is that the amount of pearlescent powder transferred to the printed product is insufficient, and the pearlescent effect is deteriorated.
Solution: Re-engrave roll

7. There is enough pearl effect on the printing surface, but there is no gloss, because the diluter used is too dry.
Solution: The slow-drying solvent should be added to allow the pearlescent powder to have a good time in the printing layer to form a good pearl reflection surface.

3. Streaks appear when printed When printing pearl surface in a large area, sometimes there will be vertical stripes, this is due to improper roll caused by, so when printing a large area of ​​pearl surface should use the appropriate depth of mesh carving or diamond Patterned surface roll, squeegee should always check and replace.
4. Post-printing pearl powder is severely exfoliated (1) The diluting agent has poor adhesion;
(2) excessive dilution;
(3) too much pearl powder;
(4) It can be protected by a layer of water-based gloss oil;
(5) The dilute agent has poor affinity with pearl powder, which means it is not very compatible.