The invention discloses a production process for coloured
polyester staple fibre. In the production process, regenerative PET (
Polyethylene Terephthalate) material is used as the
raw material, and the finished product is acquired by pre-treating, rotary
drum drying,
melt spinning, cooling forming, winding, drafting,
curling, oil applying, thermosetting and
cutting-off in sequence, wherein the rotary
drum drying comprises the steps of firstly
drying the regenerative PET material for 7.5h-8.5h and then adding master batches with the final
mass fraction of 2%-10%, and toner; the total
drying time is 9.5h-10.5h; both the screw rod and the
spinning beam of a screw extruder in the
melt spinning step are at the temperature from 265 DEG C to 275 DEG C; spinneret plates are provided with 3500 bores having the
diameter of 0.2mm and are arranged in 14 circles; cooling forming is realized through circular air blow, the temperature of the circular air is 22 DEG C to 26 DEG C, and the velocity of the circular air is 4.0m / s to 5.0m / s; the total draft multiple is 3.0-3.2 times; and the thermosetting temperature is 168 DEG C to 172 DEG C, and the thermosetting time is 13 minutes to 17 minutes. Theproduction process can save the cost and is helpful for
environmental protection; the produced product has smaller
linear density, higher
colour fastness and smooth and comfortable hand feeling.