In the printing production process, the printing screen often appears plugging plate, once the plugging plate not only reduces the printing quality but also greatly affects the printing efficiency. Once the plug version will increase a lot of downtime, resulting in low production efficiency, but also cause film production losses. How to start to solve the problem of plug version.
Generally speaking, FMCG product packaging bags have more outlets and are more delicate, so what causes the plugging problem? We usually find that it is caused by the ink and the printing plate as well as the operation.
Ink
1. Poor ink flowability During printing production, some operators like to adjust the ink back into the ink cartridge slowly to allow more ink to be stored between the anilox roller and the rubber roller. This method is suitable for full-plate printing, because the ink fluidity is slow, resulting in an increase in the amount of ink on the printing plate, but printing dots or fine characters will appear plugging phenomenon.
Solution: To prevent printing plugs, you must speed up the fluidity of the ink, which can be solved by adjusting the air pressure of the ink supply pump.
2. Ink drying too fast When the ink is transferred from the anilox roller to the printing plate, and then the printing plate is transferred to the film, because the ink dries too fast, the ink dries on the printing plate, so that the accumulation of ink is formed on the printing plate Plugging phenomenon.
Solution: This kind of situation is better to judge. When wiping the printing plate, the ink on the printing plate is more difficult to wipe, usually caused by the ink drying too fast, which can be solved by adding new ink or adding a slow drying agent.
3. Ink viscosity is too high, too high ink viscosity will also cause plugging, the reason is the same as poor fluidity, reduce the viscosity of the ink can be solved.
Once again, the dust and paper powder in the ink fall into the ink, and the dust is transferred to the printing plate through the ink system to form a plugging phenomenon. You can install a filter screen in the ink inlet tube, and the mesh is only 120 mesh. To control the printing viscosity and increase the color density of printing, it is generally appropriate to control the viscosity at about 9 seconds.
The printing plate does not match the anilox roller
The printing plate is mainly due to the mismatch between the printing and the anilox roller. For example, if the 300 mesh anilox roller is to print an 80-line pattern, then the ratio will be blocked regularly because the mesh of the 300 mesh is too large and the ink The amount of transfer will lead to too much ink on the printing plate, causing printing dots to block the plate, resulting in a mismatch between the printing plate and the anilox roller.
Solution: The conventional ratio is 1: 4.5, which is more reasonable.
Human error
The personnel operation is mainly due to the excessive pressure and the deformation of the printing plate, resulting in the expansion of the printing dots, and the resulting dots are clogged. The printing pressure gap is generally about 0.1-0.2 mm of the film thickness.
Liberation method: To train production operators to prevent printing plugging caused by excessive printing pressure.
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