The invention discloses a production technique of three-dimensional curly hollow
polyester staple fibers, wherein the production technique comprises the steps of: utilizing regenerative PET material as
raw material; sequentially performing the following procedures to obtain a finished product: pre-treating,
drum drying, melting
spinning, cooling forming, winding, stretching,
curling, oiling,
cutting and
heat setting, wherein the
drum drying duration is 9.5-10.5 h, a spinneret plate in the melting
spinning procedure is three-dimensional hollow
helical, the cross section of a spinneret orifice is a sealed space formed by sealing the circular arcs of two concentric circles, the temperatures of the
threaded rod of a
threaded rod extruding
machine and the box body of a
spinning box are 265-275 DEG C; a circular air blowing asymmetrical cooling forming mode is utilized, the circular blowing blast temperature is 20-24 DEG C, and the circular blowing
wind speed is 4.7-5.7 m / s; the total stretching fold is 2.5-2.7 folds, the main
curling pressure of a
curling wheel is 0.05-0.1 MPa, and no backpressure exists; the
heat setting temperature is 175-180 DEG C, and the
heat setting duration is 10-14 min. The production technique of the invention has the advantages of saving the cost and protecting the environment, and the prepared finished product not only has good three-dimensional configuration and bulkiness, but also has better
thermal stability.