(57) A spinneret assembly for spinning multi-ingredient composite fibers, each of which
has a large number of core ingredients finely dispersed in an intervening ingredient,
includes at least three kinds of elements W, X and Z. A first element W has at least
a composite stream forming region 10 in which two separately guided polymer streams
I and II are joined, and channels (4, 5, 7) and (9) respectively for the two polymer
streams I and II. A second element X has a stationary type dividing device 11. A third
element Z has a converging portion 12 and a nozzle orifice 13 discharging the resultant
composite stream to form a multi-ingredient composite fiber. From the fibers thus
produced, extremely fine filaments are obtained by dissolving the ingredients other
than core ingredients.
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