The invention discloses a production method of a fine-denier porous POY black
yarn. The method comprises the following steps of:
drying semi-dull slices,
drying black
masterbatch, adding the slices and the black
masterbatch material into a screw extruder, fusing the added materials in the screw extruder, respectively
processing the fused materials in a
metering pump and a
spinning beam,
spinning on a pack, cooling the materials by lateral blowing, applying oil on strands,
processing the strands in draw-off godets GR1 and GR2, winding and shaping, and inspecting products. The method is characterized in that the step of
drying the black
masterbatch comprises the following sub-steps of: based on a continuous drying mode, firstly, adding the black masterbatch into a
crystallization and drying tank, introducing heated dry air from the lower part of the
crystallization and drying tank, and blowing out the heated dry air from the top of the
crystallization and drying tank so as to dry the black masterbatch, wherein the
drying time is 2 hours, the dried black masterbatch falls into an intermediate
material storage bin for storage under the crystallization and drying tank, and the black masterbatch is further injected by a masterbatch
injector under the intermediate
material storage bin. The production method of the fine-denier porous POY black
yarn has high masterbatch spinnability and better
cooling effect, and can improve the oil application uniformity of
spinning cakes and the productivity.