The relationship between ink temperature and viscosity

The relationship between temperature and viscosity in ink is very close. When the temperature rises, the viscosity will decrease, and vice versa. This is a general rule, and the relationship between them can be expressed by the following formula.

For some inks, the viscosity may decrease by more than 20% when the temperature increases by 1°C. For ink , the control of viscosity is so important. In addition to this factor, when the temperature rises , the mobility of resin chain segments in ink will increase, the interaction between molecules will weaken, and the viscosity of the polymer will also decrease . , increased mobility.

Therefore, in the printing process, to keep the quality of the printed product consistent, it is necessary to keep the ink level consistent, so it is necessary to strictly control the temperature of the printing workshop and keep the temperature of the ink constant during the printing process. This measure is very important, otherwise the quality of the printed product will be affected. Unstable (because the temperature rises, the viscosity decreases, and the density of the printed matter will decrease). In addition, during the ink production process, the temperature in the grinding machine should be controlled ( because mechanical grinding process is accompanied by heat generation), otherwise, it will cause the ink to start to work hard, and the viscosity will increase after a period of time. This kind of problem is encountered in the later experiments, and the circulating water cooling method can usually be used. This also tells us at the same time that the determination of the ink load needs to be carried out after the ink is obtained and left to stand for several hours (to keep the temperature constant and uniform), otherwise, the determination of the anvil value of the ink will not be accurate.