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Natural fibers are easy to be creased during the process of using which can be perceived as the results of external forces bending fibers and the fibers fail to restore after the external force disappearing. Wrinkle principles are that there are a mass of hydrogen bonds in fiber amorphous region and the fibers lack chemical cross-linking. So when the external force or water molecules act on fibers, hydrogen will be destroyed and translocation will happen between molecular chains. The deformation can not restore thoroughly when external force disappear because there are not enough constraining force between molecules to make the fibers return to their original shape. Therefore, the wrinkles appear.
1. Covering theory: textile finishing chemicals can form high elastic film nets that can cover the surface of fiber and form viscosity nodes between fibers after high temperature condensation and addition reaction which, as a consequence, can promote elastic recovery of fibers.
2. Resin deposition theory: textile finishing chemicals form resin nets inside the fiber after being baked and the resin deposition deposit on amorphous region. Resin deposition stop fiber macro molecules and basic structural units from deformation by mechanical friction and hydrogen bonds. Therefore provide textile wrinkle resistance.
3. Covalent cross-linking theory: finishing chemicals can react with fibers under certain conditions which can form covalent cross-linking among fiber molecular chains and basic structural units. Therefore it can reduce the deformation of fibers that can not restore immediately which caused by hydrogen bonds destruction during the process of deformation. As a result, it can enhance the fibers' ability of restoring from deformation and achieve the goal of anti creasing.