Research on color difference between PLA and PET fibers dyed with disperse dyes

15 typical disperse dyes were selected and applied to the dyeing of PLA and PET fibers. The color characteristic value and maximum absorption wavelength of the two fibers were examined and significant color difference was shown between the two fibers. Light shade effect displayed on the PLA fiber when compared with PET. Less color difference was shown between the two fibers when they were dyed with anthraquinone type and heterocyclic azo type dyes which were more suitable for dyeing PLA, PET union fabrics or blended fabrics. Having analyzed the properties of PLA and PET as well as the compatibility of dyes,the dyes suitable for PLA/PET blend system was put forward.