When using wide-format flexographic printing, how do you sometimes deal with unclear printed text?
There are two cases to explain: If it is a large area paste, there may be ink drying speed is too fast, the printing pressure is not enough or the two ends of the roller are inconsistent, the number of lines of the anilox roller is too high or there is severe wear. Reduced ink transfer, ink pressure, or printing pressure. There should be a corresponding solution: adjust the ink, reduce the drying speed; reasonably adjust the printing pressure; replace the anilox roller; reasonably adjust the ink pressure and the printing pressure. If it is a partial stencil, it may be that the layout is uneven and the amount of ink is not uniform. The improper cleaning of the anilox roller partially reduces the volume of the local mesh. Then it should be trimmed or patched; it should be checked and thoroughly cleaned. During the printing process, a strip-shaped imprint on the paper appears parallel to the roller axis. What are the reasons?
According to the different reasons for the production of ink bars, there are mainly three types of ink bars, namely toothed ink bars, roller ink bars and vibrating inks. If it is a gear-type ink stick, the cause of the failure is mainly manifested in the defects of the roller and the mesh drive gear, such as: the wear of gears and bearings; the error of the drive gear is too large; there are foreign materials on the gear tooth surface; the lubrication is bad, etc. It may be incorrectly installed. If it is roller type, it is because the accuracy of the anilox roller itself is not high or it is easy to install. It is mainly manifested in: (1) The geometrical error of the anilox roller is too large (2) The anilox roller is poor and appears large The radial runout (3) The bearing installation is poor in three aspects The vibration ink is more complex, mostly related to the performance of the machine and the maintenance and maintenance of the equipment and other factors, often caused by the vibration of the relevant parts. For example, the vibration caused by bearing wear, the vibration caused by poor printing and pasting, the vibration caused by the steady loss of the printing pressure, and the vibration caused by poor drive motor stability. It is necessary to point out that once the above-mentioned failures occur, all tests and inspections should be immediately stopped to find out the fundamental cause of the failure and eliminate them.
During the printing process, the paper fiber and the filling material are peeled off or pulled off. What causes this phenomenon and how to eliminate it?
The problem refers to the phenomenon of pulling hair. The fundamental reason for the generation of pulling hair is that the ink viscosity and the surface strength of the paper are out of balance, that is, the viscosity of the ink is higher than the surface strength of the paper.
The solution is:
(1) Composition and Viscosity of Ink: Adding a varnish and thinner, pay attention to the amount of diluent added not to be too much, to the minimum is appropriate.
(2) Performance of paper: Appropriately improve the smoothness of the paper and reduce the ink absorption performance of the paper.
(3) Printing pressure: Adjust the ideal printing pressure to meet the minimum printing pressure for basic requirements.
(4) Reasonably choose the printing speed.
How to control the tension between the feed shaft and the feed roller?
Due to the action of the pulling roller, the printing material is pulled from the feeding shaft into the printing part at a certain speed and tension. The tension of this part is greater than the tension of the printing part. Usually, the tension is controlled by the brake connected to the feeding shaft. . As we all know. At the same time, the diameter of the roll gradually becomes smaller. Due to the high speed, the variety of materials used, and the large change in the diameter of the coil, it is impossible to obtain high-quality prints using manual mechanical brakes. Now choose the automatic control method, use the tension measurement table to use the data management, its detection method has the spring shaking roller type and the micro displacement type examination.
Mechanical brakes have been used since very early, and they are cheap, but they are not accurate, so there are other forms. Magnetic powder brakes use magnetic powder as a friction medium to generate braking force through current, because of its good linearity in torque-current characteristics. Although pneumatic brakes are used in many printing machines, they are gradually replaced by large-capacity magnetic powder brakes because of the non-linear torque characteristics and large wear factors.
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