How to improve the dyeing quality of overflow dyeing machine?

1、 The influence of fabric capacity of overflow dyeing machine on dyeing quality.

Overflow dyeing machines have a maximum nominal capacity, which is not suitable for any fabric. Therefore, the actual capacity of the overflow dyeing machine needs to be determined according to the thickness and width of the fabric in production. For fabrics of the same width, the thinner they are, the smaller their capacity is. This is because if the lightweight fabric is fed according to the nominal capacity, it will inevitably cause the fabric length to be too long and the dyeing cycle to be long, which is easy to make the fabric knot due to disorder in the dyeing room, resulting in fabric spots.

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

The fabric in the dyeing room is pulled by the winch and then enters the nozzle. 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 fabric, changing the position where the fabric is folded due to accumulation in the dyeing chamber. The speed of the fabric depends on the winch speed and nozzle pressure. In the temperature area where the fabric absorbs dyes, increasing the cycle times of the fabric, that is, improving the running speed of the fabric, is conducive to the level dyeing of the fabric. When the liquid volume is certain, by increasing the dye flow (i.e. increasing the nozzle pressure), the circulation times of dye can be increased, the temperature in the dyeing machine and the uniformity of dye distribution can be improved, the contact times between dye and fabric can be increased, and the dyeing time can be shortened.

While improving the fabric speed and increasing the number of dye circulation, we should pay attention to the coordination 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 large, then the cloth speed is greater than the winch speed, which is easy to cause fabric abrasion; If the winch speed is too fast, which exceeds the ability of the nozzle to pass through the fabric, the fabric will accumulate at the nozzle, block the nozzle, stop the dyeing machine, and cause fabric stains.

3、 Effect of bath ratio on dyeing quality

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 bath ratio is too small, it will be difficult for the fabric to run, and the winch will not smoothly lift the fabric from the dyeing room, and the fabric will run slowly. If the bath ratio is too large, the fabric floats on the water, which is prone to disorder and knot, making the fabric dyed. Moreover, if the bath ratio is too large, it is bound to increase the amount of dyes and additives, and increase the labor intensity of batching operation. Therefore, the determination of bath ratio should be minimized without affecting the fabric operation and ensuring the dyeing quality.

4、 Influence of dyeing process on dyeing quality

(1) The main factors affecting the overflow dyeing quality of inclusive dyes are dye use and addition method, dyeing temperature, the type, dosage and addition method of salt and alkali, dyeing time, dye bath ratio, etc. Among the above influencing factors, except for the adding method of dyes, salts and alkalis and the bath ratio, the other factors only affect the depth of fabric color, that is, the factors that affect the fixation rate of reactive dyes.

(2) For disperse dyes. When dyeing with disperse dyes at 90 ℃, the heating rate can be higher. When it is above 90 ℃, especially when it is close to 130 ℃, the heating rate should be controlled to make it slowly approach the dyeing temperature, so as to avoid uneven dyeing. The dyeing of disperse dyes is strongly affected by temperature. Therefore, increasing the circulation times of fabric and dye solution in the temperature area of dye absorption can make the dye and temperature in the dyeing room evenly distributed, which is conducive to the level dyeing of fabric.

After dyeing, the temperature should be lowered slowly to avoid creases caused by sudden cooling. When it is reduced to 100 ℃, rapid cooling can be adopted, and then overflow cleaning can be carried out to further reduce the temperature in the dyeing room. If the drainage and water inflow are carried out at a higher temperature, it is very easy to form fabric creases and affect the dyeing quality.