Soft flow dyeing machines and airflow dyeing machines are currently developing towards high quality, good hand feel, wide applicability, short process flow, energy saving, water saving, small batch and large capacity, automatic control and conformity to ecological and environmental protection.
Jet dyeing machine is usually defined as a dyeing machine with nozzle pressure between 2-3kg/cm2. Its characteristic is that the nozzle pressure is large, and the ejected liquid stream produces enough thrust to push the fabric to run, and the cloth guide roller only plays the role of guiding and counting the speed of the fabric. Due to the fast cloth speed, the dye liquor and the fabric are exchanged frequently within a unit time, thereby improving the leveling effect and avoiding permanent wrinkles. This type of equipment is more suitable for dyeing purified fiber fabrics or woven fabrics. For fabrics with loose structure, due to the large continuous friction and pulling force, it is easy to cause fluffing, pilling and elongation. Jet dyeing machine can be used not only for dyeing fabrics, but also for desizing, pre-shrinking and alkali reduction of polyester fabrics.
In order to reduce the impact of water on the structured loose fabric, reduce the phenomenon of pilling, improve the feel and appearance of the fabric, lifting rollers (cloth guide rollers) are widely used to assist the operation of the fabric and reduce the nozzle pressure to 0-1kg/cm2, This type of low-pressure nozzle dyeing machine is called an overflow dyeing machine, and a dyeing machine with a nozzle pressure of 1.2kg/Cm2 is usually called a slow-flow dyeing machine. Due to the slight impact of the nozzle liquid on the fabric, the application of the overflow dyeing machine is more extensive than that of the jet dyeing machine and the slow flow dyeing machine. According to the needs of different dyeing temperature, the overflow dyeing machine can be divided into high temperature and high pressure type and normal temperature and pressure type.
The main difference between an soft flow dyeing machine and an overflow dyeing machine is that the overflow dyed fabric is driven by liquid flow, while the airflow dyeing machine uses an aerodynamic system to push the fabric. The running speed of the fabric is related to the fabric's grammage, air permeability (related to the square grammage of the fabric and the structure of the fabric), the wet and dry state, and the wet and dry friction factor.
Airflow dyeing also has an independent liquid flow circulation system. Airflow atomization dyeing is to mix airflow and overflow at the nozzle. Because there is no liquid circulation, it can achieve ultra-low bath ratio, and the fabric is dyed in the dye liquor in the atomized state. Atomized dyeing is suitable for processing ultra-fine fiber fabrics and chemical fiber simulation fabrics.
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