If we talk about the appearance problem of composite aluminum foil, the first thing we think of is the problem of no white spots when the machine is unloaded. In fact, I personally think that the so-called white spots are not just white spots. It also includes the following aspects, which need to be carefully screened. Different situations The solutions are also different.
1. Different appearance problems
1. White spots appear in areas with white ink or light-colored ink;
2. Regular small bubbles or dots appear throughout the page;
3. Snowflake-like spots appear;
4. Small, shiny glue dots appear on the PET surface.
2. Corresponding solutions
1. White spots appearing in white ink or light-colored ink areas
If the problem of white spots occurs, we must first analyze and determine whether the amount of glue applied is enough? How is the leveling of the chosen glue? Whether the particle size of the white ink is too coarse, etc., the white spots can be easily solved by making appropriate adjustments according to different reasons.
2. Regular small bubbles or dots appear on the entire page.
Regular small bubbles appear all over the page: There may be two situations for small bubbles. One is irregular small bubbles formed by tiny dirt inside. If you look carefully or use a magnifying glass, you can clearly see that there is a tiny particle inside. of dirty things. The other is regular air bubbles or small dots.
