Ink thixotropy

The thixotropy of the fluid, that is, the fluid becomes thin when agitated, but it returns to its original thick state after being left for a while. In the silk screen printing process, the ink is thickened after standing for a certain period of time, the viscosity becomes large, and the ink becomes thin after stirring, and the viscosity also becomes a reversible phenomenon. It is generally believed that the thixotropy of ink is mainly caused by the flocculation of the pigment in the ink, and the flocculation of the pigment in the binder is often reversible. The thixotropy of screen printing ink is as small as possible. In order to eliminate this unfavorable factor, the ink must be fully agitated before printing to return it to its normal state and then printed.