When dyeing, before the fabric enters the tank, first open the water inlet valve through the control system to enter the water. This water inlet is automatically controlled by the electric control system through the preset liquid level. When the water inlet reaches the set liquid level, The water inlet valve is automatically closed to stop water inlet.
This amount of liquid is actually the amount of liquid required for the main pump and pipeline to circulate and dissolve the dyestuff, which is the first part of the dye solution.
Because the dyeing machine adopts the differential pressure transmitter analog quantity accurate liquid level control, the analog quantity value is displayed on the control computer instead of the actual liquid quantity value. In the actual application process, the equipment is in the initial installation and debugging , Through calculation and water level adjustment, the actual liquid volume corresponding to each level is obtained. Therefore, the actual liquid volume value of the water can be known through the simulated liquid level displayed by the computer.
For the same tank type, the water inflow is the same, that is, the liquid level set by the control system is constant. In fact, it is the protection level that satisfies the normal operation of the dye liquor circulation system of the airflow dyeing machine. Once set, the general The situation does not need to change at will.
The exchange between the dyed fabric and the dye liquor is completed in the nozzle system. If in the cloth storage tank, part of the fabric accumulated below is immersed in the dye liquor, and part of the fabric accumulated on the top is not soaked in the dye liquor. It will cause inconsistencies in the probability of each section of the fabric in contact with the dye solution. At the same time, because this part of the dye solution exchanges with the dye solution in the nozzle system and the fabric, there is a certain temperature difference and dye concentration difference, so it is easy to cause dyeing Dyeing quality problems such as poor dyeing sections.
Too high water level actually increases the dyeing bath ratio and dyeing production cost. On the premise that the bath ratio can meet the dyeing conditions, it is completely unnecessary to increase the bath ratio artificially.
In the dyeing production process of the dyeing machine, dyeing basically goes through four stages from cloth feeding to cloth discharging. One of the important links is the dyeing process, which is called the dyeing process.
The influence of dyeing process on dyeing quality
　　●Dyes and adding methods
　　●Dyeing temperature
　　 ●Types of salt and alkali
　　●Dyeing time
　　●Dye liquor bath ratio
Among the above influencing factors, in addition to the way of adding dyes, salts, and alkalis, and the bath ratio, other factors only affect the shade of the fabric, that is, the factors that affect the fixation rate of reactive dyes.
For disperse dyes. For disperse dye dyeing at 90℃, the heating rate can be higher, and above 90℃, especially close to 130℃, the heating rate should be controlled to slowly approach the dyeing temperature to avoid uneven dyeing. The dyeing of disperse dyes is strongly affected by temperature. Therefore, in the temperature region where the dye is absorbed, increasing the number of cycles of the fabric and the dye liquor can make the dye and temperature distribution in the dyeing room uniform, which is beneficial to the level dyeing of the fabric.
After the dyeing is finished, the temperature should be lowered slowly at the beginning to avoid fabric wrinkles caused by sudden cooling. When the temperature drops to 100°C, the temperature can be quickly cooled down to 80°C, and then overflow cleaning is performed to further reduce the temperature in the dyeing room. If the discharge and water inflow are performed at a higher temperature, it is easy to form fabric creases and affect the dyeing quality.