Applications of Ultraviolet Irradiation in Surface Modification and Improvement of Dyeing and Finishing Processes of Proteinous and Cellulosic Fibers

Nowadays, numerous chemical and physical methods are being used for modification of properties of textiles. In recent years, due to stringent ecological restrictions, textile industry has been forced to use green and eco-friendly technologies. Ultraviolet (UV) irradiation, as a clean, eco-friendly, simple, inexpensive, and promising technology has been extensively used for surface modification of fibers and production of functionalized textiles. UV irradiation enhances dye-ability, color strength, wet-ability and reduces pilling and felting and does not impair bulk properties such as strength and handle. In addition, using UV technology, optimal dyeing time and temperature can be decreased resulting in saving energy and lower process cost. The aim of this study is to review the latest literature published on the applications of UV irradiations for modification of properties and characteristics of natural protein (wool and silk) and cellulose (cotton) fibers. For this purpose, different types of UV sources, ranges of effective UV irradiation, and its application in different industries as well as modification of fibers are described. Then, the results of the latest investigations are reviewed according to natural fiber type of wool, silk and cotton.