Automatic Control of Supercritical CO2 Fluid Dyeing

The home-made equipment and its working principle were introduced. Dyeing by this equipment makes the color fastness to rubbing, sunning and washing of modified cotton fabrics to reach level 4-5, as well as a good dyeing evenness. Design the automatic control system of Supercritical CO₂ Fluid dyeing equipment, and research on practical applications of fuzzy controller is investigated. On analysis of the features of technique, in order to reach a good dyeing effect, controlling the temperature and pressure of dyeing equipment is the key technology development of control system. Those variables have the characters of non-linearity, time-variation, and inter-coordination, etc. Fuzzy control strategy can enhance the capacity of resisting disturbance of system in different states and external conditions, which can reach an excellent control effect. Therefore, the research utilizes fuzzy controller to control the equipment, which makes its process parameter realize the real-time monitor and accuracy control under the condition of close to the optimal condition. Also, human-machine interaction interface increases the programming quality, and makes the functions of monitor and control reasonably arranged.