There are many reasons for the phenomenon of white spots in Ningxia yin and yin aluminized packaging bags. There are three main reasons: 1. The particle size of the ink is large or the particle size distribution is not wide, and the particle size of the white ink generally has a large influence. Ethyl ester in the binder is a good solvent for the ink. The results of infiltration of ink particles of different particle sizes are different. The difference in chromaticity after heating or baking in an oven will make a difference, and it seems that a "white point" is produced. Generally, in this case, when the machine is off, the white point phenomenon will be alleviated and may disappear. When printing, it is best to add 1.5-3% M-27 coupling agent such as Tianyang Chemical Factory to increase the tightness of the pigment filler in the ink system to resist the large area caused by solvent infiltration and destruction in the adhesive system. White spots or spots. 2. The surface tension of the adhesive is high, and the effect of infiltration and spreading on the aluminized film is poor. This is the "white point phenomenon" of the current aluminized film, and it is also the main cause of spots on other composite films. The coating effect of the adhesive is not good, and after the printing layer is covered, the color of the different parts is changed, and the same effect as before is generated, and sometimes large spots are generated. 3. Equipment process reasons. On the one hand, the workers are not aware of the special characteristics of the aluminized film composite. The aluminized film composite has its unique place. On the other hand, the pressure on the two sides of the sizing process is inconsistent, even in the drying and coating systems. The problem cannot be ensured that the adhesive is sufficiently uniformly coated or that the ethyl ester is not sufficiently volatilized. There are other reasons, such as the full-bottom printing screen roller web is too shallow, reducing the ink hiding power.
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