Welcome to the Xianghuai Website.We are mainly engaged in designing and manufacturing flexographic printing machines.

In the printing process, if the overprinting is inaccurate, it will affect the actual printing effect. What are the reasons for the inaccurate printing of the flexographic printing machine? How to solve these problems? Let's take a look at it below.

1. Guarantee plate accuracy, accurate alignment.

   When installing the plate, it is generally hand-applied, which requires a high degree of proficiency. The edge of the plate must be parallel to the axis of the plate cylinder, and the seam should be as close as possible. Otherwise, it is easy to cause the plate at the seam. Rolling and beating. If a plate is replaced separately, the plate is often overprinted due to different plate making time. At this time, the plate can be softened by a hair dryer, and then stretched longitudinally or laterally to be consistent with other plates.

2. Tension control.

   In the printing process, due to the unstable tension, a large amount of waste is likely to occur, so the tension of the material should be strictly controlled. Generally, there is a magnetic powder tension controller and a tension driving roller at the unwinding and winding of the machine, and both have tension display. Because the material has joints, the tension will always fluctuate each time the joints come over, and the rules can be adjusted in advance to reduce the amount of waste. If the printing job is to be replaced, if the newly changed material is wider, the wear of the tension driving roller will often be caused by the narrower material in front, and the wide material is replaced by the wide material to form a bridging effect on the middle of the rubber roller. Tight, loose in the middle, has a great impact on the slitting unit in the back. At this time, the rubber roller needs to be replaced, or the surface of the old rubber roller can be flattened and used. In addition, the air-up shaft core will become loose after a long time, and it is necessary to check it.

3. Constant speed printing.

   For large-volume printing, under the condition that the process is relatively mature, it is better to adopt fixed-speed printing, so that the influence of the drying device on the material deformation is relatively uniform, and it is easy to overprint. Other process parameters such as ink viscosity, tension setting, etc. can all have a fixed range, so that the quality can be guaranteed.

   Therefore, in the printing process, the flexographic printing machine encounters inaccurate overprinting and needs to be solved in time to ensure good printing results.