Curling causes and solutions of the hottest flexo

2022-10-24
  • Detail

Reasons and solutions for the curl of flexographic digital products

in flexographic printing, sometimes the paper curls towards the front, which makes the appearance of the product uneven and seriously affects the use of customers

the reason for this phenomenon is that in the flexo printing process, there is a trend towards "functionalization, ecology and high-end" high-tech development, which has helped the drying profit continue to grow in recent years. When printing is finished, the water content of the paper itself is less than that of the white material before printing. Plus printed matter, UV glazing is generally required. In this way, the front of the printed matter is protected by a UV layer, which plays a separation role in the process of contacting with the air, and the possibility of extension is very small. Because there is no protective layer on the reverse side, the paper must be lengthened under the influence of air humidity, and the deformation of the paper itself under different humidity is that the reverse side is larger than the front side, which causes the product to curl up. We might as well do a small experiment: put the flexographic UV polished product into a cup with a certain temperature, then wipe the surface clean and apply a thin layer of mechanical oil on it, and the water vapor will damp the paper upward. We can see that UV faces the mouth of the cup, accepts moisture, and the product is almost deformed; However, if the back faces the mouth of the cup, the product will immediately deform and curl towards the front

after knowing the reason, we can take countermeasures: coat the back of the paper with a minimum amount of substance to make it play a protective role in contact with the air. For example, Arabic gum 3% - 5%, this phenomenon is basically solved

source: keyin

sound 2 Nylon material and traditional oil pan material performance on lighting:

Copyright © 2011 JIN SHI