Melt spinning method and spinneret for flat section synthetic fiber

摘要

The present invention relates to a melt spinning method of a flat cross-section synthetic fibers, in particular polyamide fibers for producing a covering yarn for stockings, using a flat for multifilament punctured through the discharge hole of the slit type, In the step of melt spinning the polyamide-based multifilament of the phase and simultaneously supplying and cooling the cooling wind by the one-side blowing method, the long axis direction of the flat cross section is provided through the discharge holes arranged in the direction of the cooling wind by 5 ° or more and 25 ° or less. The present invention relates to a melt spinning method of flat cross-section polyamide fibers having improved spinning stability and uniformity.;The present invention also includes a melt spinneret of flat cross-section synthetic fibers perforated such that the angle θ between the major axis direction of the discharge hole and the cooling wind direction is 5 ° to 25 °.