Continuous compressing and decompressing processes are necessary to get deep shade in supercritical fluids dyeing. In this experiment, we tried to find cosolvent in fine denier polyester fabric dyeing with carbon dioxide as a solvent in order to raise the exhaustion of dye. From the results, we can see solvents like carrier which can swell the fibers have no sufficient effect in the increment of dyeability. But another solvents such as DMF (dimethylformamide) and DMSO (dimethyl sulfoxide) which can disperse the dye particles can raise the dye exhaustion to twice about the normal procedure (dyed only with carbon dioxide), and cannot effect the properties of crystallize and heat of these fiber. After treatments are still needn’t in this technology and materials used in this process can be recycled. So dyeing polyester by supercritical carbon dioxide technology with little cosolvents is more economic than water dyeing method.
