RECYCLED POLYESTER STAPLE FIBER USING WASTE POLYESTER AND METHOD THEREOF

摘要

The present invention In the polyester short fiber using recycled polyester manufactured by depolymerizing waste polyester, the depolymerization process of mixing waste polyester and ethylene glycol (EG) to produce bis-2-hydroxyethyl terephthalate (BHET), A regenerated polyester chip manufacturing step comprising a polycondensation step of polycondensing the bis-2-hydroxyethyl terephthalate (BHET) with regenerated polyester; A fiber manufacturing step of manufacturing a fiber by melt spinning and stretching the dried regenerated polyester chip; A first heat treatment step of increasing the degree of crystallinity by heat-treating the prepared fibers on a roller surface at 170 to 220 ° C. for 5 to 30 seconds; A crimping step of imparting crimp to the heat treated fiber; A second heat treatment step of drying and heat-treating the crimped fiber in a hot air of 65 to 175 ° C. for 5 to 30 minutes; And it relates to a recycled polyester short fibers using the waste polyester comprising a cutting step of producing the heat-treated fibers into short fibers and a method for producing the same.