How to improve the dyeing quality of overflow dyeing machine?

1. The influence of the capacity of the overflow dyeing machine on the dyeing quality.

Overflow dyeing machines have a maximum nominal capacity, and this nominal capacity is not suitable for any fabric. Therefore, in production, the actual capacity of the overflow dyeing machine needs to be determined according to the thickness, width, and other conditions of the fabric. For fabrics of the same width, the thinner and lighter the fabric, the smaller the capacity. This is because if the light fabric is fed according to the nominal capacity, it will inevitably cause the fabric length to be too long, and the cycle period during dyeing is long. It is easy to make the fabric knotted in the dyeing room due to disorder and cause fabric mottling.

2. The influence of winch speed and nozzle pressure on dyeing quality.

The fabric in the dyeing room is drawn into the nozzle by a winch. The nozzle is a ring-shaped outlet, and the dye liquor is sprayed from the gap of the nozzle. With the pressure of the nozzle, the dye liquor is sprayed on the rope-like fabric, and the speed of the fabric is determined by the speed of the winch. And nozzle pressure. In the temperature region where the fabric absorbs the dye, increasing the number of cycles of the fabric, that is, increasing the running speed of the fabric, is conducive to the leveling of the fabric. When the liquid volume is constant, by increasing the dyeing liquid flow rate (that is, increasing the nozzle pressure), the cycle times of the dyeing liquid can be increased, the temperature in the dyeing machine, the uniformity of the dye distribution, and the number of contact between the dye and the fabric are increased, and the dyeing time is increased. shorten.

While increasing the fabric speed and increasing the number of dye liquor circulation, the overflow dyeing machine should pay attention to the mutual cooperation between the winch speed and the nozzle pressure, otherwise it will directly affect the product quality. For example, if the winch speed is too slow and the nozzle pressure is too high, then the cloth speed is greater than the winch speed, which will easily cause fabric scratches; if the winch speed is too fast, the fabric will accumulate at the nozzle if it exceeds the nozzle’s ability to pass through the fabric. Blocking the nozzles causes the dyeing machine to stop running, causing fabric spots.

3. The influence of bath ratio on dyeing quality

The size of the bath ratio not only affects the color of the fabric, but also affects the normal operation of the fabric in the dyeing machine. If the liquor ratio is too small, the fabric will be difficult to run, the winch will not be able to lift the fabric from the dyeing room smoothly, and the fabric will run slowly. If the bath ratio is too large, the fabric floats on the water surface, and it is prone to disorder and knotting, making the fabric dyed. Furthermore, if the bath ratio is too large, it will inevitably increase the amount of dyes and additives, and at the same time increase the labor intensity of the batching operation. Therefore, the determination of the bath ratio should be as small as possible without affecting the operation of the fabric and ensuring the quality of dyeing.

4. the effect of dyeing process on dyeing quality

(1) The main factors that affect the quality of the dye overflow dyeing machine are the use and adding method of dye, dyeing temperature, the type, dosage and adding method of salt and alkali, dyeing time, dye liquor bath ratio and so on. Among the above influencing factors, in addition to the way of adding dyes, salts, and alkalis, and the bath ratio, the other factors only affect the color depth of the fabric, that is, the factors that affect the fixation rate of reactive dyes.

(2) For disperse dyes. For disperse dye dyeing at 90°C, the heating rate can be higher, and above 90°C, especially close to 130°C, 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 the fabric wrinkles caused by the sudden cooling. When the temperature drops to 100°C, the temperature can be quickly lowered 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 carried out at a higher temperature, it is easy to form fabric creases and affect the dyeing quality.