What is the working principle of the gas-liquid dyeing machine?

The working principle of the gas-liquid dyeing machine is to use the synergistic effect of airflow and dye liquid to dye the fabric. The specific process is as follows:
Airflow generation and action: The gas-liquid dyeing machine is usually equipped with a fan and other devices to generate high-speed airflow. These airflows serve as the power for the fabric to move in the dyeing machine. Compared with the traditional dyeing machine that relies on water flow to drive the fabric, airflow driving the fabric can reduce the impact and wrapping of the water flow on the fabric, reduce the probability of creases and uneven dyeing of the fabric, and enable the fabric to move more freely in the dyeing machine, which is convenient for effective mechanical finishing.
Dye circulation and injection: The dye is drawn out from the water collection tank at the bottom of the cylinder under the action of the dye circulation system. After heating and other treatments, the dye is supplied to a specific nozzle (such as a water flow nozzle or a front-mounted combined dye nozzle). Then, the dye is sprayed out from the nozzle and contacts the fabric driven by the airflow to color the fabric. After the dye is exchanged with the fabric, it flows back to the water collection tank through the pipeline, and the cycle repeats over and over again.
Temperature control: Temperature control during the dyeing process is very critical. Gas-liquid dyeing machines are generally equipped with heating and cooling systems to accurately adjust the temperature of the dye solution to meet the dyeing requirements of different dyes and fabrics. For example, during the dyeing heating process, the fiber is swollen or the chemical fiber macromolecular chain is stretched by reasonable temperature control, thereby controlling the dyeing rate of the dye; during the cooling process, it is also necessary to ensure that the temperature changes smoothly to avoid problems such as creases on the fabric due to excessive temperature differences between the gas phase, liquid phase and fabric.
Assisted by special structural design: Some gas-liquid dyeing machines are also equipped with special structures to improve the dyeing effect. For example, the design of the front-mounted combined dye liquid nozzle allows the fabric to contact the dye liquid faster in a single cycle and obtain the heat transfer of the dye liquid in time. The dye liquid has various spraying methods and exchange forms, which can be selected according to the dyeing characteristics of the fabric fiber, which is conducive to shortening the thermal equilibrium time of the heat transfer system; in some gas-liquid dyeing machines, the dye liquid nozzle is set before the cloth lifting roller. After the dye liquid exchanges with the fabric, a part of the dye liquid will flow in the opposite direction of the fabric operation and pre-exchange with the fabric before entering the nozzle, preheating the fabric in advance and shortening the thermal equilibrium time of the fabric; the extrusion effect of the cloth lifting roller on the fabric with liquid and the osmotic pressure effect of the airflow on the fabric with liquid, etc., are all helpful to accelerate the heat diffusion between the fiber surface and its interior, and provide favorable conditions for the temperature field required for the uniform dyeing of sensitive colors.
In addition, in the actual dyeing process, it is also necessary to reasonably select dyes and auxiliaries according to factors such as the material, color requirements and dyeing process of the fabric, and correctly set various parameters in the dyeing process, such as air flow velocity, dye liquid flow, dyeing time, etc., to ensure the quality and stability of dyeing.
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