When performing UV printing, sometimes the graphics of the previous work order will appear on the back of the print, so that the unprinted image will appear on the next print, resulting in waste of the print.
Why change the printing plate to start the next printing, there will be the image of the previous printing on the printed sheet. There are two reasons for the analysis. First, some components of the UV ink in the image gradually penetrate into the blanket, and the cleaning ability of the UV car wash Poor, so that the UV ink of the previous printing on the blanket is not completely washed, resulting in the image of the previous printing being transferred to the next printed printing; the second is due to the poor quality of the car wash water or It does not match the characteristics of the blanket. When cleaning the blanket, it causes the non-graphic parts of the rubber material to swell and swell, causing the outer dimensions of the rubber cylinder to change or the blanket to relax. When printing, the local printing pressure is too large or too small. It is possible that the outline of the previously printed image and text is transferred to the subsequent print again.
The former reason mostly appears on the initial printed sheet of the next print. After dozens of sheets of paper are passed, the residual ink of the original image on the blanket is transferred, and the fault will be solved to a certain extent. The latter reason is due to the improper selection of car wash water, which has caused local uneven deformation of the blanket, which will inevitably cause the loss or deformation of some graphic dots on the existing printing. In particular, the local expansion deformation of the blanket is equivalent to the uneven printing pressure between the blanket and the substrate, which will inevitably cause the mechanical dot change to be more serious, and this uneven change in printing pressure is more difficult to control. It cannot be completely solved by other adjustment methods.
Therefore, it is very important to use high-quality UV car washing water for the cleaning of the blanket when printing with UV ink. To choose the appropriate UV car wash water, you must first clearly understand the UV blanket. The UV blanket contains not only EPDN, but also natural rubber. It must have good corrosion resistance to be suitable for UV ink printing and UV car wash water cleaning. Enterprises can test the matching of the blanket and the ink and the matching of the blanket and the car wash water according to the ISO12636 standard test method. Secondly, the performance of the UV car wash water directly affects the cleaning effect of the blanket and the impact on the performance of the blanket. The high-quality UV car washing water is formulated with high-quality formula and high purity, which has no damage to the printing machine and has a high flash point (60oC). It has the advantages of fast cleaning speed, good cleaning effect, reduced downtime, and effective restoration of rubber surface characteristics. Create a safe printing production environment and improve the operating working environment, so that the rubber blanket maintains good ink transfer performance, and the amount of consumption is saved, which effectively reduces costs and improves efficiency.
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