Effects of Alkali Pre-Treatment on the Appearance and Structural Properties of Lyocell Woven Fabrics with Different Weave Types

Alkali process of cellulosic fibres is an important process in terms of improving dyeability and surface properties of fibres. Mechanical and structural properties, appearances, colours and fibrillation tendencies of Lyocell fibres change depending on types and concentration of alkali, material form, process temperature and auxiliary chemicals used. In this study, effects of alkali pre-treatment at different concentrations on appearance as fibrillation, abrasion and pilling resistance and on structural properties as density, thickness and weight of 100% Lyocell fabrics in different weave types (plain, twill, ribs) are investigated. Alkali pre-treatment decreased the tendency of fibrillation of Lyocell fibres, resulting in increased abrasion resistance and reduced pilling tendencies. Alkali pre-treatment increased the volume of yarns in the fabric due to increase in the Lyocell fibre diameter and caused to open twist spirals and shrinkage in the fabric. Warp and weft densities, fabric thickness and weight of Lyocell fabrics in all weave types increased by the increase in alkali concentrations