Water open fiber polyester is a new generation of water-soluble polyester designed by our company in 2015 according to the environmental protection regulations. It overcomes the disadvantage that high concentration of lye must be used when opening the fiber of island silk. Only 10% of the original concentration of lye is used to complete the fiber opening,reducing the pollutant NaOH in the process of fiber opening by 90%. It also retains the advantages of the original COPET and WDPET.The appearance of this produet makes the island silk get rid of the defect of heavy pollution and become a kind of sustainable product.It is the original product of our company and the related patent is being applied for.