When dyeing, before the fabric enters the vat, the water inlet valve is first opened through the control system to allow water to enter. The amount of water entering is automatically controlled by the electrical control system through the pre-set liquid level. When the amount of water entering reaches the set liquid level, position, the water inlet valve automatically closes and stops water inflow.
This liquid volume is actually sufficient to meet the requirements of the main pump and pipeline circulation and dissolved dye materials. The required amount of liquid is the first part of the dyeing liquid.
Since the dyeing machine uses a differential pressure transmitter for analog precise liquid level control, what is displayed on the control computer is Analog value, rather than actual liquid volume value. In the actual application process, during the initial installation and debugging of the equipment, the actual liquid volume corresponding to each liquid level is obtained through calculation and water level adjustment. Therefore, the actual liquid volume displayed by the computer is By simulating the liquid level, you can know the actual liquid volume of the incoming water.
For the same cylinder type, the amount of water input is the same, that is, the liquid level set by the control system is constant. In fact, it satisfies the dye liquor circulation system of the airflow dyeing machine. The protection liquid level for normal operation, once set, generally does not need to be changed at will.
The exchange of dyed fabrics and dye liquor is completed in the nozzle system. If it is in the cloth storage tank, the part of the fabric accumulated below is soaked in the dye liquor and the accumulation If the upper part of the fabric is not soaked in the dye liquor, the probability of contact between each section of the fabric and the dye liquor will be inconsistent. At the same time, there is a certain temperature difference between this part of the dye liquor and the dye liquor exchanged with the fabric in the nozzle system. Because of the difference in concentration of dyeing materials, it is easy to cause dyeing quality problems such as dyeing and uneven dyeing.
If the water level is too high, it actually increases the dyeing bath ratio and increases the dyeing production cost. On the premise that the bath ratio can meet the dyeing conditions, artificially increase the bath ratio. The ratio is completely unnecessary.
In the dyeing production process of the dyeing machine, dyeing basically goes through four stages from the cloth input to the cloth output. One of the important links is the dyeing process, which is called the dyeing process.
The impact of dyeing process on dyeing quality
●Dye and adding method
●Dyeing temperature
●Types of salts and alkali agents
●Dyeing time
●Dye liquor liquor ratio
Among the above influencing factors, except for the addition method of dyes, salts and alkali agents and the liquor ratio, the other factors only affect the shade of fabric color. , that is, the factors that affect the fixation rate of reactive dyes.
For disperse dyes. When dyeing with disperse dyes, the heating rate can be larger at 90°C. Above 90°C, especially when it is close to 130°C, the heating rate should be controlled so that it approaches the dyeing temperature slowly to avoid uneven dyeing. The dyeing of disperse dyes is strongly affected by temperature, so increasing the number of cycles of the fabric and the dye solution in the temperature area where the dye is absorbed can make the dye and temperature distribution in the dyeing room even, which is conducive to leveling the fabric.
After dyeing is completed, start to slowly lower the temperature to avoid fabric wrinkles caused by sudden cooling. When the temperature drops to 100°C, rapid cooling can be used to lower the temperature to 80°C, and then overflow cleaning can be performed to further reduce the temperature in the dyeing room. If the water is discharged and water is introduced at a higher temperature, it will easily form fabric creases and affect the dyeing quality.
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