Manufacturing method for polyester fine denier multifilament. The length
of a protective delay shroud of the radial outer-flow quenching system used in
melt spinning process for manufacturing fine hollow polyester filaments is expressed
as (28060throughputfilaments square), and the length of quenching
air tube is from 15 to 40 centimeters. The velocity of quenching air is between
0.2 m/sec to 0.6 m/sec. For the layout of the spinneret orifices, the diameter
difference of outermost layer orifice and the innermost layer orifice is set less
than 20 mm; and the distance between the diameter of innermost orifice layout and
the diameter of quenching air tube is at least 12 and less than 33 mm. The orifice
density of spinneret layout (orifice density) is set as 715 orifices per
square centimeter.
