The dye bath of the airflow dyeing machine is a dye bath that participates in the exchange to make the fabric dyed (in fact, the amount of liquid required for the moisture absorption and swelling of the fabric itself and the flow of the fiber surface) and the circulation of the main pump and pipeline system to make the dye liquid energy. The dye bath is composed of two parts, which can quickly achieve uniform temperature and uniform concentration of dyeing materials. It is not used to drive the fabric, so the water consumption is small, so the bath ratio is small.
Dyeing with a small liquor ratio means that the probability of contact between the dye and the fiber is increased under other conditions being the same. Conducive to dye uptake. At the same time, since the dosage of auxiliaries decreases with the decrease of the bath ratio, the dosage of dyeing auxiliaries is greatly reduced. However. When dyeing with small bath ratio, the change of dye bath is easy to cause the fluctuation of bath ratio. The fluctuation of the liquor ratio will affect the concentration of the additive or the pH value. This is very detrimental to the reproducibility of dyeing and dyeing processes. Therefore, the accuracy and stability of controlling the liquor ratio during airflow dyeing are very important in the actual process of airflow dyeing. The liquid level in the filter can be preset. The fabric man tank is first watered to the water level beforehand. This part of the liquid. In fact, it is the above-mentioned amount of dye liquor required for the circulation of the main pump and pipeline. is a constant value. When entering the cloth. Due to the hygroscopic swelling of the fabric, part of the liquid will be taken away and the liquid level will be reduced. At this time, the automatic control system will automatically open the water inlet valve for automatic water replenishment. Until the fabric is completely hydrated and puffed. After the liquid level returns to the original set water level. The water replenishment automatically stops the replenishment amount of the fabric tank process. In fact, it corresponds to the amount of liquid required for the hygroscopic swelling and surface flow of the fabric. Different fabrics have different amounts of liquid. Therefore, when calculating the bath ratio. The liquid volume should be calculated according to the constant value of the above liquid level plus the liquid carrying amount of the fabric. For each fabric, under the condition of equal weight, the respective liquid carrying amount is constant, and at the same time. The liquid level of the filter can also be precisely controlled by the differential pressure transmitter and the computer automatic control system. Airflow dyeing gives complete control over the accuracy of the liquor ratio.
In order to control the stability of the liquor ratio. To prevent the fluctuation of the liquor ratio. during the dyeing process. Use as much liquid as possible. However, when dyeing with direct dyes and reactive dyes. Sometimes more neutral electrolytes need to be added. The dyes in the return liquid are easy to accumulate in the high concentration of electrolyte and cause dyeing defects. In order to avoid dyeing defects. Electrolytes can be added first and diluted with refluxing water. Add the dye but the alkali used for fixing the color must be dyed.
Color added later. If using the liquid back material. The dye in the dye liquor is precipitated in the saturated lye solution, resulting in dyeing defects such as color stains and color spots. Therefore, it must be dissolved and diluted in the chemical tank with water before pouring into the tank. This part of the liquid volume caused by the change of the bath ratio. If the color depth of the fabric is affected, this part of the dye liquor should be considered in the calculation of the liquor ratio.
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