To improve the quality of flexographic printing , we must first ensure the quality of the ceramic anilox roller. The anilox roller is used as a quantitative transfer roller, and its ink transfer amount is determined by the number of screen lines and the mesh volume. These two parameters are very important. The number of screen lines directly determines the resolution of the printing; the size of the mesh determines the amount of ink transferred by the anilox roller. The mesh volume requirement is very accurate, and a slight error will affect the ink transfer effect of the anilox roller. When the anilox roller is clogged with impurities such as ink, paper, paint, etc., the printing quality will be greatly reduced. Therefore, in order to maintain the printing quality and extend the life of the anilox roll, it is necessary to use the anilox roller reasonably.
Damage to the anilox roll
Physical damage
The chrome oxide ceramic on the surface of the ceramic anilox roll is chemically stable and generally does not react with chemical solvents, but it is highly susceptible to external force erosion, causing scratches, cracks, and defects on the surface of the roll. Such damaged anilox rolls are not easy to repair and need to be marked to make use of the layout of the plates to be staggered.
2. The color intensity is weakened
Due to poor cleaning, the cells are blocked, the mesh volume is reduced, and the amount of ink is reduced, so that the amount of ink released per unit area of ​​the anilox roller is reduced, and the transferred ink layer becomes thinner, resulting in a lighter color of the printed matter, which becomes a paste. Edition, ink.
3. Grinding line
Usually refers to the friction of the steel scraper on the surface of the roller, the wear line is brightly circled around the roller and is consistent with the direction of rotation of the roller. It can be observed by a magnifying glass of 200 times or more that these marks are the worn parts of the mesh, that is, the top of the mesh wall. Generally, bright circles are caused by the squeegee grinding off the metal particles, which is much better in some devices with closed ink chambers, ink supply systems, filters and magnet adsorption devices. Of course, the installation of the blade is also important.
4. Periodic natural damage
Under normal circumstances, anilox roller as a frequently used ink transfer tool will undoubtedly be damaged during use and maintenance, such as the limitation of cleaning situation, excessive use of cleaning equipment, resulting in collapse of the wall wall, the original crack The longitudinal extension and so on. The direct consequence of the collapse of the mesh wall is that the opening of the mesh becomes larger, the amount of local ink increases, and the dots of the high-gloss portion are bridged, and the level of the printed matter is lost.
Ways to reduce and avoid damage to the anilox roller
In order to avoid damage to the anilox roller, it is necessary to do two things well, that is, the anilox roller is used reasonably and the anilox roller is cleaned correctly and in time.
1. Anilox roller use precautions
Anilox rolls are the most delicate mechanical parts on flexographic printing presses. Due to the special structure of the surface, they are easily damaged. Therefore, care must be taken during use. When using an anilox roller, it should be ensured that the force is even, otherwise the ink hole structure on the surface is easily damaged, so the following points should be used during use and storage.
(1) Before use, carefully check the surface of the anilox roller for oil, dust or powder. If the above substances are present, they must be cleaned. Because the oil can make the ink undeliverable, the particles will cause wear on the anilox roll. If there is a large scratch on the surface of the anilox roller, it must be stopped, otherwise the scar will expand rapidly, causing damage to the ink fountain roller and the printing plate, so that the quality of the printed matter cannot be guaranteed.
(2) Before use, check the transmission gear between the anilox roller and the ink fountain roller to ensure that there is no debris between them. Applying a little gear lubricant can improve the phenomenon of the anilox roller beating due to debris, improve the ink transfer effect of the anilox roller, and reduce the chance of ink stick on the printed matter. Eliminate the friction between the anilox roller and the ink fountain roller or the doctor blade in the dry state, and ensure the minimum pressure between the ink roller and the anilox roller or the doctor blade and the anilox roller. If the pressure is too large, the abrasion of the anilox roller will be aggravated. At the same time, the inappropriate pressure will also cause uneven axial transfer of the anilox roller.
(3) When using the anilox roller, the doctor blade should also be replaced according to the timing of the print. If the blade is used for a long time, it will wear on the anilox roller due to its own wear and tear. In addition, the softness of the doctor blade and the length of the edge will have an effect on the life of the anilox roll. In addition, attention should also be paid to the adjustment of the pressure and angle of the squeegee.
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