Optimizing Dyeing Vessel Liquor Ratios for Fabric Quality
Optimizing liquor ratios requires balancing steam and salt savings against pump turnover rates to prevent severe shade unlevelness and mechanical creasing.
Airflow Dyeing
Gaseous Transport
Pressurised gas represents the primary medium for circulating fabric ropes within modern jet dyeing machines. In airflow dyeing, a high-velocity stream of air or inert gas drives the textile through the transport tube rather than relying on a liquid bath stream. This method isolates the transport of the fabric from the application of the liquor.
Aerodynamic Circulation
Atomisation nozzles inject the dye liquor directly into the gas stream where it is distributed onto the moving rope as a fine mist. This aerosol mist ensures uniform contact across the substrate without immersing the fabric in a continuous volume of liquid. Because the rope is propelled by air, tension is reduced, which prevents the formation of running creases during the cycle.
Resource Consumption
Liquid requirements are limited to the volume necessary for fabric saturation and chemical penetration, yielding a very low liquor ratio. Typical values for this ratio fall between one to three and one to four, compared to the much higher volumes of conventional jet processing. Reducing this volume decreases the thermal energy needed for heating and cooling the bath, resulting in lower steam demands.
Substrate Limitation
Delicate knitted fabrics made from synthetic or blended yarns respond well to this process, but extremely heavy woven materials may resist even distribution of the mist. If the construction is too dense, the atomised droplets cannot penetrate the inner core of the yarn, which results in surface-only coloration.