Since the drying of the paint and the formation of the paint film are a very slow and continuous process, in order to observe the entire change in the drying process and the time required for actual drying, an automatic drying time Tester can be used. One is to use the motor to drive the gear through the reduction box, and move linearly on the paint film at a slow speed of 30mm/hour, and the whole process takes 24 hours. With the gradual drying of the paint film, the gear marks will gradually change from deep to shallow until they disappear completely.
The other is to use a motor to drive a funnel filled with fine sand and move it slowly on the paint-coated board, and the sand will continuously fall on the paint film to form linear traces of sand grains to measure the different stages of drying. the time required. Further, it is useful to slowly draw a circle with a radius of 5 cm on the paint film with a needle tip. It takes 24 hours to draw a circle, so that the drying degree of the paint film can be observed on a smaller test panel area over time. and the time it takes to actually dry.
