Three Roll Mills is used for the manufacture of paints, inks, pigments, plastics, and other slurries. It is achieved by grinding the surfaces of three horizontal rollers by mutual extrusion and friction at different speeds. Each three roll mill must be tested for a 30 min no-load at rated speed before leaving the factory. The product shall meet the following requirements.

1. Three Roll Mills operates normally, smoothly, without abnormal sound, with a flexible and reliable control device.

2. The joints and fasteners of three roll mills shall not be loosened.

3. At least two sets of three roll mills in batch production shall be sampled and tested annually according to JB/T9820.3. The results shall be in conformity with the requirements and the paint coating quality shall be checked according to JB/T5673.

4. Three Roll Mills shall be inspected and accepted in accordance with this standard. If the product is not up to standard, it should be resubmitted for acceptance after repair by the manufacturer. Under the condition that the user complies with the operation manual prescribed by the manufacturer, the manufacturer shall guarantee repair, replacement, and return of the damaged parts within one year from the date of purchase due to the poor quality of the products.