holes of the orifices of each group of the outer ring of groups more closely spaced than those of the inner ring of groups has eliminated the power differences between inner and outer threadlines the closer spacing within each group of the outer ring of groups also increases the spacing between groups thereby reducing filament migration application_number US 88794686 A description referring to fig1 in the dry spinning of spandex filaments a solution of the segmented polyurethane is first prepared preferably by carrying out the polymerization in the solvent to be used for the spinning operation the spinning solution of suitable viscosity is pumped to a spinneret assembly 10 mounted in the dry spinning cell 12 as the solution is extruded from the spinneret it is met by a co current stream of hot inert gas introduced to the cell through inlet 14 the solvent of the spinning solution is evaporated into the hot inert gas thereby converting the several streams of spinning solution into continuous filaments 16 as they proceed down the cell a counter current stream of inert gas may also be introduced at the bottom of the cell through inlet 18 to minimize dripping of solvent from the cell the two streams of inert gas meet and are drawn off through an aspiration device 20 near the bottom of the cell the.