1. Effect of temperature on printing ink yellow viscosity The temperature and humidity of the printing environment will directly affect the change of printing ink yellow. The increase of temperature and humidity will accelerate the volatilization of ink, especially when the temperature difference is large in winter and summer; Therefore, ink suppliers generally make appropriate adjustments to the ink formula in the current season according to seasonal changes. For example, if the ink entered in winter is stored for use in summer, the viscosity of the ink must be tested and adjusted again. Printers must attach great importance to the impact of ink temperature. Before printing, the ink temperature should be stabilized at the temperature of the printing workshop. This measure is very important, otherwise the ink viscosity will change significantly in the printing process. 2. Effect of pH value on printing ink yellow viscosity The pH value of another index that needs to be controlled in the application of printing ink yellow, the normal range is 8.5-9.0. At this time, the printing performance of water-based ink is the best and the printing quality is the most stable. In the process of printing operation, the ink continuously circulates in the ink conveying system of the printing machine to the ink bucket, and the volatile components and water in the ink volatilize in the air over time. Therefore, the performance of the ink used for a long time must change due to the change of components, resulting in the decrease of pH value, the increase of ink viscosity and the slow drying speed. The influence of pH value on the printability of printing ink yellow is mainly reflected in the viscosity stability and dryness of ink and dot clarity. In the process of use, due to the continuous volatilization of ammonia in the printing process, with the decrease of pH value of ink, the viscosity of ink increases and the drying speed slows down, which will inevitably affect the normal progress of printing. Therefore, the operator needs to add new ink and various additives to the ink from time to time, and the pH value of the ink will change. The operator must master the ink mixing principle and process method of ink, and must not add and adjust at will. The ink supplier will provide technical support. When using the standard pH meter during operation, the pH value of ink can be easily measured and adjusted timely and accurately. Control the viscosity of printing ink yellow, so that the printing work can be carried out continuously and stably, maintain the pH value of ink, and stabilize the viscosity of ink.Printing Ink suppliers website:http://www.kageminks.com/printing-ink/