The invention provides a spinnerette assembly for forming
multicomponenthollow fibers of the sheath/core type. The spinnerette
assembly contains an extrusion orifice and a core forming material passage
in communication with the extrusion orifice. A hollow needle extends
through the extrusion orifice in a concentric manner to define an annular
passage surrounding the needle. The core forming material passage includes
a core forming material inlet port extending from a surface of the
spinnerette assembly to an interior of the assembly and a transverse
passage extending from the core forming material port to the annular
passage surrounding the needle. A bore forming fluid passage communicates
with the interior of the needle. The spinnerette assembly contains at
least one sheath forming material passage also in communication with the
extrusion orifice.
