| abstract |
(57) [Summary] [Structure] When producing polyester short fibers for spun yarn containing 1% by weight or more of titanium dioxide and a fineness of single fiber of 0.5 denier or more, alkyl ether or alkyl of polyoxyethylene or polyoxypropylene. A specific composition oil agent consisting of phosphate potassium salt, fatty acid ester, cationic surfactant and polysiloxane is added to the fiber. Add 0.1 to 0.4% by weight. [Effect] It is possible to prevent scum from occurring and to perform spinning with good operability for a long period of time. |