The anilox roller has problems during use, and it is necessary to analyze the specific problem in order to find an effective solution. The following are analysis and countermeasures for common problems that anilox rolls are prone to occur during equipment operation.
Bright lines or dents appear in the circumferential direction of the anilox roll surface
1. Closed squeegee is more prone to roll surface scratch than single squeegee and rubber roller extrusion
The scraper is used to scrape the ink in the ink chamber and the ink tank. The impurities in the ink chamber and the ink tank cannot be removed in time, or the ink is not cleaned and the ink is dry. If the ink and the dry ink are present in the ink circulation system, Friction is formed between the doctor blade and the anilox roller, which causes a circumferential scratch on the ceramic surface, which is expressed as a bright line in the circumferential direction. The small bright lines that are initially produced will appear as a very shallow line on the printed product. This is because the mesh wall will become wider after damage, and the widened mesh wall will block the mesh on the side, resulting in these nets on the side. The ink in the hole cannot be completely released. If the scratch is severe, the bright line will become wider and deeper, and a deeper line will appear on the printed product. The reason is that the groove on the bright line partially breaks and forms a groove in the circumferential direction on the roll surface. There will be too much ink transferred to the print.
2, the new processing anilox roller machine is prone to roll surface scratches
For newly processed anilox rolls, ceramic and mesh scratches are more likely to occur at the beginning of the machine, because the finish of the new anilox roll face ceramic is not as good as the anilox roll that has been used for a while, during operation. In the middle, some ceramic powder will be generated due to the contact force between the scraper and the anilox roller. If these ceramic powders are not removed in the closed ink chamber or the ink pipeline, they are more likely to cause circumferential damage.
3. The dust and impurities on the surface of the paper are not cleaned and the roller surface of the anilox roller is easily scratched.
In addition, the removal of dust or small particles on the surface of the paper may cause scratches in the circumferential direction of the surface of the anilox roll. The impurities on the surface of the paper are brought into contact with the printing plate and brought into the surface of the anilox roll. Once the impurities are embedded between the anilox roller and the doctor blade, the circumferential direction of the anilox roller is easily scratched. It is recommended to use paper of better quality and remove dust from the surface of the paper.
Specific methods to reduce and eliminate surface scratches on the anilox roll:
Thoroughly clean the ink tank, the closed scraper chamber and the ink circulation system in time. After cleaning, check the dead angle of the ink tank and the closed scraper chamber to prevent the re-entry of impurities and dry ink.
For newly processed anilox rolls, the initial printing speed should not be too high, and the use time should not be too long to avoid the friction between the ceramic powder embedded in the doctor blade and the anilox roll. It is generally recommended that the initial printing speed does not exceed 60 m / min, after 6 hours of running-in time, stop, replace the blade, ink block, thoroughly clean the ink tank and cavity, and then officially print.
The blade pressure is strictly controlled. If the blade pressure is too large, the contact surface between the blade and the anilox roller will also increase, and the possibility of scratching the anilox roller by impurities and dry ink will be greatly increased.
The use of high-quality scraper blades and the use of imported scraping blades can reduce the risk. The domestic blades are prone to gaps during use.
Ensure the flatness and straightness of the wiper blade installation. If the blade is not installed directly, it will affect the ink scraping effect or damage the roller surface of the anilox roller. The uneven pressure of the tablet will cause the blade to be wavy, which will cause scratches on the roller surface of the anilox roller.
Make sure to use good quality paper and paper dusting on the surface.
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