Influence of Dyeing Process of Overflow Dyeing Machine on Dyeing Quality

Flood dyeing machines have a maximum nominal capacity which 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 and width of the fabric. For the same width of fabric, the thinner it is, the smaller the capacity. This is because if the light and thin fabrics are fed according to the nominal capacity, the length of the fabric will be too long, and the cycle period during dyeing will be long, which will easily cause the fabric to be knotted due to disorder in the dyeing room, resulting in fabric mottled. The main factors that affect the dyeing quality of the overflow dyes include dye usage and addition method, dyeing temperature, type of salt and alkali agent, dosage and addition method, dyeing time, dye liquor bath ratio, etc. Among the above influencing factors, in addition to the addition method and bath ratio of dyes, salts and alkali agents, the other factors only affect the depth of fabric color, that is, the factors affecting the fixation rate of reactive dyes.

for disperse dyes. When dyeing with disperse dyes at 90°C, the heating rate can be larger. Above 90°C, especially when it is 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, so in the temperature region of absorbing dyes, increasing the number of cycles of fabric and dye liquor can make the dye and temperature distribution in the dyeing chamber uniform, which is beneficial to the leveling of fabrics.

After the overflow dyeing machine is finished dyeing, the temperature should be lowered slowly to avoid the wrinkling of the fabric caused by the quenching. When the temperature drops to 100 °C, rapid cooling can be used to reduce the temperature to 80 °C, and then overflow cleaning is performed to further reduce the temperature in the dyeing room. If the discharge and water are carried out at a higher temperature, it is easy to form fabric creases and affect the dyeing quality.