Ultrafine polyester drafting and setting process method

The invention relates to the technical field of textile, and discloses a superfine polyester drafting and setting process method which comprises the following steps: raw material preparation: selecting polyester particles with the purity of at least 98%-99.5%; double-layer extrusion: firstly heating and melting polyester particles through a primary extruder, and then refining and extruding molten polyester through a secondary extruder with a precise temperature control system to form primary non-oriented fibers; fine cooling: using a combined cooling system, including primary direct water cooling and secondary air cooling, to gradually reduce the temperature of the fibers to room temperature; and accurate drafting: in a constant-temperature environment, fibers are drafted according to a certain proportion through an electronically controlled drafting machine. By means of the fine cooling system, gradual cooling of fibers from high temperature to room temperature is achieved, generation of thermal stress is pr