The invention discloses a production method of circular-blow multi-end bright profiled
polyester filament yarns more than 3dpf (denier per filament), which is characterized in that a melt conveying
pipe is used for conveying melt within a temperature range of from 277 DEG C to 283 DEG C; a
spinning box is used for
spinning within a temperature range of from 288 DEG C to 295 DEG C,
spinning components, each having one-spinneret two-
yarn independent cavity for metering, are used for spinning,
polyester melt enters the independent cavities of the spinning components and filtered and extruded to form, and 20 yarns are extruded to form at each spinning
station; and a calm area of a circular blower is 50mm-65mm high, a circular blow cylinder is more than 230mm high, circular blow pressure is more than 35Pa, and circular blow position for the yarns is more than 900mm away from a
nozzle. By the method, the problems of insufficiency in cooling
air volume and cooling uniformity are solved effectively. The volume of circular air blow is only 30% of that of lateral air blow,
energy consumption is lowered evidently,
yarn levelness of products is high, and variation coefficient of
product profile degree is small.