1. Operating steps

① Hold the chronograph stopwatch in one hand and the 3 # Zahn viscosity cup in one hand, and adjust the stopwatch to the timing preparation state.

② Put the clean viscosity cup into the tested ink, and ask the whole cup to sink in the ink.

③ Lift the viscosity cup upwards, press the chronograph stopwatch at the moment when the ink surface of the cup is exposed, and start timing.

④. Observe the change in the viscosity of the outflow ink at the bottom of the cup. When the outflow ink changes from continuous to drip, press the stopwatch to stop timing.

⑤ Read out the calculation time on the stopwatch, which is the viscosity of the measured ink (time: seconds).

2, matters needing attention

① Before measuring the viscosity of the ink, check the inner wall of the viscosity cup and the outflow hole for solid matter adhesion or blockage. If necessary, clean it before measuring. Otherwise, the measured viscosity is not true.

② When measuring the dark ink and then measuring the light ink, the cup ink must be washed (or wiped) to avoid contaminating the light ink and causing hue change.

③ When adding the solvent, it is necessary to stir while adding, and slowly add it. It is easy to damage the ink structure too quickly and cause the ink layer to precipitate.

Relationship between viscosity, external force and temperature:

The ink has a non-Newtonian viscosity, and the dispersion density of the solid fine particle nuclei is so large that they almost contact each other. It can form a network structure after being combined with an organic carrier, so the viscosity is very large. It must destroy this structure only after the external force is applied, so that the viscosity becomes smaller and flows. After removing the external force, the viscosity becomes larger, and

The restored mesh structure. On the one hand, because the organic carrier is a polymer group colloid, the temperature can destroy its aggregation and make it "dilute". Changed.