The invention discloses a
manufacturing technology for far-
infrared polyester short fibers, which takes recycled PET (
Polyethylene Terephthalate) as a
raw material, and the recycled PET is processed sequentially through pretreatment,
rotating drum drying,
melt spinning, cooling formation, winding, drawing,
curling, oil application,
cutting and
heat setting, so as to obtain finished products, wherein in the
rotating drum drying step, the recycled PET is dried for 5.5 to 6.5 hours firstly, then far-
infrared master batches are added, the final
mass fraction of the far-
infrared master batches ranges from 5 to 7 percent, the total
drying time ranges from 9.5 to 10.5 hours, and far-infrared
ceramic powders account for 19 to 21 percent in the far-infrared master batches; in the
melt spinning step, the temperatures of a screw bolt and a
spinning box body of a screw bolt extruder range from 268 to 278 DEG C, and cooling formation is carried out through circular air blow; in addition, the total
drawing ratio is 3.0 to 3.5, the
heat setting temperature ranges from 162 to 168 DEG C, and the
heat setting time ranges from 8 to 12 minutes. The
manufacturing technology can save cost and is beneficial to
environmental protection, and the prepared finished products achieve good warmth retention and
health protection properties.