In the past two years, many flexible packaging companies have carried out the test of film gravure ink. This article will share some corresponding solutions according to the printing problems often encountered in the film gravure ink test.
Poor ink transferability
The poor ink transferability is caused by many factors. The surface tension of the film is large. The ink with water as the main solvent is difficult to wet and level on the surface. The surface speed of the ink is too fast and the pH is easy to occur. Variety. In addition, the angle and depth of the gravure cell will have a certain impact on the ink transferability. In this regard, ink suppliers need to continue to improve the performance of ink, gravure platesetters should also adjust the gravure plate making parameters with the application of film gravure ink, such as laser engraving and plate-making, and increase the number of screen lines.
Pinhole
Pinholes, also known as white spots, sometimes appear in full versions, sometimes appearing locally. If it occurs repeatedly at a fixed part, it is called a mechanical pinhole. Usually it is caused by dirt or aging defects in the printing plate or guide roller. If it happens by accident in a non-fixed part, it is called chemical pinhole. The quality problem of the film gravure ink itself is mainly due to the excessive addition of the defoaming agent. For pinhole failure, the former can be remedied by cleaning the plate or the guide roller (or replacing the plate or guide roller); the latter, for the flexible packaging enterprise, on the one hand, it is necessary to carefully screen the film gravure ink product, another In the printing process, an appropriate amount of neutralizing agent can also be added to eliminate it, but it should not be added excessively.
After printing, the ink is dried in the printing equipment and the printing grid.
Since the film gravure ink can be diluted with water or an alcohol solvent, the printer or the plate can be washed with tap water or a washing solution after washing. If the ink is dry (dry) in the cell of the printing plate or transfer roller, it can be infiltrated with butanol or ethanol, then coated with TM-200S coupling agent on the surface, and finally rinsed with water.
Registration is not ideal
For a long time, this problem has always plagued us, so we dare not take the application of film gravure ink. Because of the large ink tension, it is even more difficult to apply on non-absorbent, non-polar plastic flexible packaging. Ink suppliers have been researching for a long time to continuously improve the structure of ink to accommodate the registration of film gravure, but there is still no film gravure ink of the same quality as solvent ink overprinting. Judging from the actual situation of some domestic flexible packaging enterprises testing the film gravure ink, the registration of water-based white ink has not been a problem, and other color inks have yet to be further improved.
High-light, dark-tone parts have a weak contrast
If the transferability of the ink is good, the performance of the shallow web reproduction will be more prominent. During the transfer of the ink in the gravure cell through the doctor blade to the plate roll, if the viscosity of the ink changes is not obvious, the dot will be easily reproduced completely. However, due to the inherent difference between ink and solvent ink, if the gravure engraving parameters are still set according to the intaglio engraving parameters of the conventional solvent ink, it is easy to cause the gradation contrast of the highlight and dark adjustment parts to be greatly reduced. When making intaglio for ink, it is better to make the gradient gradient steeper, the darker part is slightly deeper, and the middle to high-profile part is slightly shallower. With these points in mind, the highlight and dark tone gradients can be perfectly reproduced.
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