Synthetic fiber: is a kind of chemical fiber, is made of synthetic polymer compounds as raw materials and chemical fiber collectively, with small molecular organic compounds as raw materials, after polymerization reaction or polycondensation reaction synthesis of linear organic polymer compounds, such as polyacrylonitrile, polyester, polyamide, etc. Raw materials are obtained by synthetic method, production is not restricted by natural conditions, in addition to the general superior properties of chemical fibers, such as high strength, light weight, easy to wash and dry, good elasticity, not afraid of mildew, etc., different varieties of synthetic fibers have some unique properties.