It is important for researchers developing dyeing technology to improve the dyeing techniques of polyester micro fiber fabrics in terms of the time efficiency. The empirical observations have led to the deploying of the O-type dual-nozzle flow dyeing machine developed by Asia Kingdom Machinery Industry Co., Ltd. to serve such purpose. The economic advantages include reducing the liquid ratio to 1:8 and reducing the water volume required by 20-40. The electricity required by 48-80 less compared to conventional upward or downward type dyeing machines. Therefore the CO{sub}2 production is decreased by 60, demonstrating energy efficiency and environmental friendliness. The nozzle pressure of a single nozzle machine is 1.6-3.0 kg/cm{sup}2, whereas by adjusting the flux passing front and back nozzles, the dual nozzle pressure is maintained in the range of 0.2-1.6 kg/cm{sup}2. The reduced pressure decreases the frequency of yarn hairness occurrence, thus improving the dyeing quality. The low liquid ratio results in dye exchange increase by 1.3-1.66 fold, significantly increasing the uniformity. Despite 40 times fewer contacts between the nozzle and the fabrics (total 244 times) compared to conventional machines, similar results were observed.
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