fig4 a and 4b the respective main orientation axis of the geometrical arrangements shown is indicated with a dotted line the cross sectional shapes which are obtainable from the hole arrangement shown depending on the respective hole diameters are self explaining the shaded structure according to figure a shows a hollow cross sectional structure which is obtainable by suitably choosing the respective distances of the four spinneret holes the preferred blowing direction with regard to both fig4 a and 4b is essentially parallel to the main orientation axis as indicated therein the same applies to fig5 a and 5b showing cross sectional shapes resulting from spinning the solution through a spinneret orifice with five adjacent spinneret holes fig6 and 7 show further embodiments including cross sectional shapes resulting from spinning the solution through a spinneret orifice with seven adjacent spinneret holes fig7 and including hollow cross sectional shapes fig8 and 9 demonstrate the influence of the direction of blowing air on the obtainable cross sectional shape of the staple fiber of the invention in each case a spinneret with various spinneret orifices each consisting of three holes arranged in the form of a triangle were used in each orifice two of the holes had a diameter of 80 u03bcm and one of the holes had a diameter of 120 u03bcm the distance from the center of the bigger hole to the center of the adjacent holes was 250 u03bcm each fig8 a 8 b and 9 a respectively show the respective spinneret configuration and the direction of the blowing air employed all other spinning parameters being constant the only variation resided in the direction of the blowing air indicated by the arrows in fig8 a 8 b and 9 a respectively as apparent from fig8 c showing the.