Working principle of airflow dyeing machine
Oct 19, 2021
In addition to the continuous circulation of the fabric and the dyeing liquor such as jet dyeing, the airflow dyeing also has a circulating flow of air flow. It uses the principles of aerodynamics. The high-speed airflow produced by the centrifugal high-pressure fan. The dye solution is atomized by the nozzle. The atomized dye liquor is sprayed onto the fabric. Make the fabric color and drive the fabric to run.
The main function of high-speed airflow in the dyeing process: First, the dye liquor is atomized through the nozzle, so that the atomized dye liquor is sprayed to the fabric, the air pressure penetrates, and the fabric and the dye liquor are in full contact. At the same time, due to the effect of the airflow field, the fabric will be The position and cross-sectional shape during operation are constantly changed by the bending and shaking of the airflow. This effect of airflow on the fabric.
Conducive to the dye liquor approaching and breaking through the fabric fiber interface layer. Make the fabric easy to get color and level dyeing. And it is beneficial to release the stress generated in fabric processing. Therefore, the fabric without crease processing has a soft and plump hand feel: the second is as a driving force for traction of the fabric. Drive the fabric to run. Due to the low gas density and low resistance, the fabric runs fast. The tension is small. no damage.
During the heating process when the airflow is dyeing. Through the fast circulation of the dye liquor, the temperature of multiple dye liquors tends to be uniform, however. The temperature of the fabric is obtained after the dye liquor exchange in the nozzle system. There is actually an instantaneous temperature difference between the fabric and the dye liquor. Dyeing machine manufacturers also have a cycle due to the fabric itself. Therefore, there are actually instantaneous differences in the temperature of the fabric. if. The heating rate of the dye liquor is every 2℃/min. The cycle period of the fabric is 2.5 minutes, so after one cycle of the fabric, the large temperature difference of the fabric may reach 5°C. The instantaneous temperature difference on the surface of the fabric may cause differences in dye uptake and result in uneven dyeing or segmentation.
When the thermoplastic fiber is dyed, if the heating speed is too fast around the glass transition temperature (the dyeing rate block increases at this time), it is very easy to cause uneven dyeing. Therefore the temperature control of the airflow dyeing. During the heating process, the instantaneous temperature gradient of the fabric is reduced in the temperature range where the dye is dyed quickly. It is the key to make the temperature of the fabric tend to be uniform. Decrease the heating rate, increase the circulation frequency of the dye liquor and the running speed of the fabric. It is an important measure to improve the uniformity of the fabric surface temperature during airflow dyeing to obtain level dyeing.