eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-06-22 12 Spl.Edn.2 827 837 10.13005/bbra/2266 13696 article Gelareh Nazeri 1 Amir Noorbakhsh 2 Danial Mohammadnezhad Karafestani 3 MSc., Amir Kabir University (Tehran Polytechnic), Tehran, Iran. MSc., Islamic Azad University, Tehran, Iran. BSc. , Islamic Azad University, Shahrood, Iran. Polyester fibers & blends of polyester/cotton fibers are commonly used in the textile industry. Properties of polyester depends on the production method. Beside the advantages of polyester, there are certain disadvantages that affect the dyeability & dyeing process. By the application of chemical process, such as surface hydrolysis, using of solvents, surfactants & enzymes or physical process like using Plasma, Gamma & UV irradiation some improvement can be made. The UV irradiated fabric (Wavenumber of UV Irradiation is 230-280 nm) was dyed with Disperse & Cationic Dyes, which showed high improvement in dyeability of the fabric with cationic dyes, whereas no pronounced effect was noticed with disperse dyes. https://www.biotech-asia.org/vol12_nospl_edn2/effect-of-uv-irradiation-on-polyester-printing/ Polyester; Chemical Modification; Dyeing; UV Irradiation