Soft flow 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 soft flow 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. The main factors that affect the quality of dyeing by overflow dyeing include dye use and adding method, dyeing temperature, 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.
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 soft flow dyeing machine finishes dyeing, the temperature should be slowly lowered to avoid fabric wrinkles caused by 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.
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