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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.

This paper is about auto-control system of the dyeing equipment by supercritical CO2, and then design the fuzzy logic controller (FLC) and study the application in practice. After dyeing with this equipment, the fastness to rubbing, sunfast and laundry resistant of fibre textile can all be grade 4. The dyeing uptake rates can reach to 86%. Furthermore, the solubility of dyeing using this equipment can reach the uniformity effect. Getting across to analyse the characteristic of the technics, the parameter of the pressure and the temperature must be controlled, which is the key to develop control system and to achieve the favorite effect. Therefore, the FLC is introduced into the auto-control system. It is realized that the parameters of this process are measured in real time and controlled accurately. When the parameters controlled are close to the condition of optimization, the favorite effect has been achieved.

Supercritical CO2 fluid dyeing, a new type of anhydrous dyeing technology, has the advantage of high uptake rate, short dyeing process, recycling of dyes and CO2, and zero discharge. This study investigated a dyeing technique of loose fibers using supercritical CO2 as solvent to replace water. Based on the existing characteristics of the self-developed supercritical CO2 dyeing equipment, a special dyeing frame of loose fibers was designed. Using the dyeing frame and inner and outer dyeing processes, polyester fibers were dyed with disperse red 153# maternal dyes at temperatures of 80–140?, pressures of 17–29MPa and time of 20–80min, respectively. The experimental results revealed that the dyeing performance of fibers was good on the dyeing frame, as well as with a favorably increased temperature, pressure and time. Dyeing temperature had a strong influence on the color yield. The dyeing results were compared with those of polyester fibers dyed with disperse red 153# dyes. With the special dyeing frame of loose fibers, color fastness to washing and artificial light was generally similar to conventional aqueous medium methods.