PVA fiber is a kind of functional differential fiber made from PVA, Which can be dissolved in water at different temperatures. According to the different dissolution temperature in water, it can be divided into high-temperature water-soluble PVA fiber(71C-100C),medium temperature water-soluble PVA fiber(41C-70C) and low- temperature water-soluble PVA fiber(0-40C).According to different used of products, water-soluble PVA fibers can be divided into water-soluble filament, water-soluble staple and ultra short water-soluble staple.