Site: Textile Value Chain
During the last few years, easy care concept has expanded rapidly to include Oil and water resistant features in many apparel applications. Easy care concept now encompasses both minimizations of ironing and easiness to clean garments that get stained in day to day use. Fabric manufacturers and chemical manufacturers have made significant advances in finishing processes to ease stain removal and prevent stain penetration Substrates that possess water and oil repellency are desirable for in many textile applications. Water repellency is increasingly becoming the focus of interest for protective clothing. This repellency can be achieved by implementing water repellent chemicals on textile fibres with minimal effects on other functional properties like strength, flexibility etc. Water and oil repellant fabrics can be used for a variety of end uses such as outerwear, where the requirement is for a high degree of water repellency and general wear such as expensive silk sarees, where the focus is more both water and oil repellency. Other common end uses for these finishes include upholstery, rugs, carpets, protective clothing Filter fleece, Uniforms, Table cloths, wallpaper, etc, etc.
Water repellency is defined as the ability of a textile material to resist wetting. In principle, water repellent treatments are based on the deposition of hydrophobic substances on the fibre. The difference between waterproof and water repellent finishes is that in the former the interstices between warp and weft yarns are completely blocked by the continuous hydrophobic film of the substance and not only water pass through the fabric, but the fabric will become impermeable to air also. Water repellent finish, on the other hand, is one in which the material is made water repellent without filling up the interstices of fabric completed which results in fabric permeable to air but not to water. Mechanical treatment, chemical treatment and coating methods are three main methods for imparting water repellency to textiles. In these processes, generally durable repellency effects are obtained. In addition to the desired repellency effects, other undesirable fabric properties are often found with repellent finishes. These include problems with static electricity, stiffer fabric hand, greying during aqueous laundering and increased flammability. Research is going on to reduce the above-mentioned problems and obtain a durable water repellent fabric.