What are the factors that affect the drying effect of envelope printing

09-10-2019

        Envelopes will have a poor drying effect during the printing process. What is the reason? What are the factors that affect the drying effect of envelope printing? The following is a detailed explanation of the factors affecting the drying effect of envelope printing, I hope to help everyone.


  1. The effect of ink on drying


  (1) The drying effect of the aqueous ink is closely related to the pH of the ink. Under the same conditions, when the pH value is too low, the drying speed of the ink is increased; when the pH value is too high, the drying speed of the ink is slow, and the back surface of the envelope is liable to be dirty.


  (2) The volatilization speed of the mixed solvent in the solvent type ink directly determines the drying performance of the ink, and the volatilization speed of the different components in the mixed solvent is different. By mixing different kinds and different proportions of solvents, the solvent evaporation rate of the ink can be conveniently adjusted to improve the drying performance.


  2. Influence of printing machine exhaust system on drying


  If the exhaust system is not smooth, the solvent that is volatilized cannot be eliminated in time. Excessive solvent concentration in the oven will hinder further evaporation of the solvent, which will affect the drying effect of the envelope printing.

        

envelope printing


  3. The effect of printing plates on drying


  For gravure printing, the depth of the plate pocket has a great influence on the drying speed, for example, a cell with a depth of 33 μm and a cell of 18 μm. The ink drying time of the former is more than 1 times longer than that of the latter.


  4. The effect of envelope printing speed on drying


  Different printing speeds have different requirements on the performance of the drying system. In the case of relatively high speed requirements, the heating distance and drying efficiency of the drying oven have relatively high requirements. If the associated drying system does not allow the solvent to fully evaporate, it is easy to cause excess solvent to exceed the standard.


  5. Impact of environmental conditions


  Generally, the envelope is printed in a temperature environment below 20 ° C, and the natural drying property of the ink is weakened. When the envelope is printed in an environment of 30 ° C or higher, the natural drying property of the ink tends to increase.


  The effect of excessive air humidity on drying: First, the moisture in the air enters the ink, causing the overall volatility of the solvent to deteriorate; second, the presence of a large amount of moisture in the air inhibits the volatilization of the solvent.


  The above is about the factors that affect the drying effect of envelope printing. I hope everyone can understand the five factors that affect the drying effect of envelope printing, and it will help everyone.


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