Soft light special-shaped polyester pre-oriented yarn and manufacturing method thereof

The invention discloses a soft light special-shaped polyester pre-oriented yarn and a manufacturing method thereof, the technological process of the manufacturing method comprises a part C, and the part C comprises a dynamic mixer, melt conveying, a metering pump, spinneret plate extrusion, cooling forming, bundling oiling, primary pre-interlacing, a first godet, secondary pre-interlacing, a second godet and winding; the air pressure of 0.02 to 0.05 MPa is adopted in the primary pre-network; the air pressure of 0.05 to 0.09 MPa is adopted in the secondary pre-network; the actual oil content of the soft light special-shaped polyester pre-oriented yarn ranges from 0.58% to 0.69%; the oil agent in the finally prepared soft-light special-shaped polyester pre-oriented yarn is uniformly distributed, and few loose loop yarn and broken yarn are generated at 18 spinning positions within 24 hours. Through two times of pre-interlacing, the oiling agent homogenizing effect is improved, spinning cakes are oiled evenly, th