In the daily printing work, printing manufacturers often check the quality of printing products, and inevitably find problems, such as the drying effect during printing. What are the influencing factors?
Influence of exhaust system of printing press on drying
If the exhaust system of the printing machine cannot be kept unblocked, the volatile solvent will not be removed in time during printing. If the solvent in the oven is too high, it will also prevent the solvent from volatilizing faster and affect the dryness of the printed matter.
Influence of ink on drying effect
(1) The influence of mixed solvents on the volatilization rate in solvent based inks directly determines the drying performance of inks, and the volatilization rate of different combinations in mixed solvents will be different. Some mixed solvents produce different solvents and different proportions of solvents, which can easily change the solvent evaporation rate of the ink, so as to improve the drying performance.
(2) The drying effect of water-based ink is mainly related to pH value. Under the same conditions, the lower the pH value, the faster the drying speed of the ink. On the contrary, the drying speed of ink will be slow. Once the ink drying speed is slow, it is easy to cause dirt on the back of the printed matter.
Influence of printing speed on drying effect
Different printing speeds have different requirements for drying performance. The speed requirements are relatively high, and there are relatively high requirements for the heating distance and drying efficiency of the oven.
Effect of printing plate on drying
Jinan printing and packaging manufacturers believe that for gravure printing, the depth of the printing plate unit has a great impact on the drying speed. For example, the depth is 33 μ M mesh and depth of 18 μ M mesh, the drying time of the former printing ink is more than twice that of the latter.
Impact of environmental conditions
Generally, when printing at a temperature below 20 ℃, the natural drying of the ink is weakened. When printing in an environment above 30 ° C, the natural drying of ink tends to accelerate. The influence of high air humidity on drying: first, the moisture in the air enters the ink, resulting in poor comprehensive volatility of the solvent; Secondly, the presence of a large amount of moisture in the air will inhibit the volatilization of the solvent.
The five factors affecting the drying effect during printing are the contents explained above. You can use them as a reference, which will be helpful for your later use or other operations. Please pay attention to our website www.xinfengyinhua Cn for more information.济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/