During continuous long-term operation, the ink circulation system of the automatic screen printing machine prevents ink sedimentation and drying mainly through the following methods:

Stirring device: Ink circulation systems are usually equipped with stirring devices, such as stirring paddles or magnetic stirrers. The stirring blade is driven by a motor and continuously rotates in the ink tank, keeping the ink in a continuous motion state. This mechanical stirring method can effectively break the aggregation of pigment particles in ink and prevent them from settling under gravity. For example, for inks containing a large amount of metallic pigments, stirring can prevent metal particle precipitation and ensure the uniformity and consistency of printing colors. The magnetic stirrer uses a magnetic field to drive the internal magnetic components to rotate, achieving the stirring of ink, especially suitable for high-precision ink that may be contaminated by mechanical stirring.

Ink circulation flow: The system will continuously circulate the ink, transporting it from the ink tank through pipelines to the printing area of the screen printing machine, and then flowing back to the ink tank. This continuous flow not only prevents sedimentation, but also ensures even distribution of ink throughout the system. For example, by designing the pipeline layout and pump flow rate reasonably, the ink can maintain a certain flow rate during the circulation process, avoiding the sedimentation phenomenon caused by local ink being stationary for a long time.

Adding diluents and desiccants: Adding an appropriate amount of diluent to the ink can adjust its viscosity, maintain good fluidity, and reduce the risk of sedimentation. At the same time, according to the characteristics of the ink and the working environment, appropriate desiccants are added to control the drying speed of the ink and prevent premature drying in the circulation system. However, the amount added needs to be precisely controlled. Excessive diluents can affect the adhesion and printing quality of the ink, while excessive desiccants may cause the ink to dry excessively in a short period of time.

Sealing and environmental control: Various components of the ink circulation system, such as ink tanks, pipelines, joints, etc., have good sealing properties to prevent external air from entering, reduce the contact between ink and oxygen, and thus delay drying. In addition, controlling the temperature and humidity of the work environment is also crucial. Generally speaking, a suitable temperature and humidity range can maintain stable physical properties of ink and reduce sedimentation and drying problems caused by environmental factors. For example, in high temperature and dry environments, temperature and humidity can be adjusted by installing air conditioning and humidifiers.