In offset printing, it is very important to maintain the balance between water and ink at all times. In daily operations, in addition to the actual situation of the actual layout of the layout, the size and distribution of the layout, the properties of the printing paper, and the performance of the ink, special attention should be paid to the following points:
1. Before starting the machine, you must add enough moisture to the dry water roller.
2. When the machine is idling, stop water supply and ink supply immediately to prevent the ink from losing its balance due to large ink and water.
3. The new-changing ink velvet sleeve is tight and flat, and the two ends must be sewn firmly. Before the machine is on, we must first fully wet the water roller, and at the same time, minimize the moisture during printing. Newly replaced water rolls tend to have higher water content than older rolls and can easily cause excessive moisture problems.
4. Never adjust the ink too thin when adjusting the ink. If the adjustment is too thin, its fluidity is too large, and its viscosity and cohesion force are naturally reduced, resulting in a drop in water resistance, which can cause severe emulsification, which causes the ink trace to spread under the pressure of the roller. In severe cases, a paste plate will be produced and the product quality will be affected. . Therefore, the amount of varnish should be controlled below 10%.
5. In the printing process, the ink tends to stick to the surface of the water roller, and the thicker and the larger the area. After the machine shuts down, the ink will quickly dry. If it is not removed in time, it will cause uneven water supply. Even if the ink is out of balance, it will affect the service life of the printing plate and the water roller. Therefore, sufficient attention should be paid to it.
6. The correct adjustment of the pressure of the water roller and the ink roller is a prerequisite for ensuring the ink-water balance. If the pressure is improperly adjusted, it often causes poor water transmission.
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