The invention aims to provide a method for preparing
polyester staple
fiber. The invention is characterized in that the method adopts the process
route of directly
spinning melt
mass to manufacture, and uses purified
terephthalic acid (PTA) and
ethylene glycol (EG) as raw materials and adds small quantities of mono-
pentaerythritol, DEG,
antimony trioxide,
titanium dioxide and other catalysts, flatting agents and
stabilizing agents. The method uses the process flow of five autoclaves
polymerization to perform polyreaction so as to receive the melt which is finally spun into tows, and prepares the
polyester staple
fiber via primary drawing, secondary drawing, 18 roller tension
heat setting, third drawing, crimping, relaxation
heat setting and
cutting. The method has the advantages of stable
raw material supply, high product strength, few defects, good
crimp, moderate oil applying rate and stable dry-heat shrinkage percentage; products prepared by the method have good spinnability, so that
yarn spun by the product is high in each quality index, and produced
textile has soft and smooth hand feeling; and the manufacturing cost is lower than
chip spinning, so that the marketing competitive power of the products is stronger.