Appeal No. 95-2622
Application 08/125,524
Bradley describes an improved spinneret assembly,
including specially shaped extrusion die orifices, for
extruding molten polymer into filaments of noncircular cross
section and melt spinning the filaments into yarn. See
Bradley, col. 2, l. 2-15, and col. 2, l. 42-44. See
especially Figures 4 and 5 for five and ten-lobal cross
sectional filaments (Bradley, col. 4,
l. 1-21). Bradley’s modification of conventional spinneret
assemblies (Bradley, col. 6, l. 65, col. 7, l. 11):
. . . extends the range of shape definition possible
for a given spinneret orifice under practical operating
spinning conditions. It is particularly applicable to
orifices comprised of multiple intersecting slots, such
as Y-section, cruciform, star, and like sections. The
invention is applicable to wet spinning and dry spinning
but is especially useful in melt-spinning. Specific
polymeric materials capable of being melt-spun include
nylon-66 (polyhexamethylene adipamide), nylon-6
(polycaprolactam), nylon-4, nylon-610, nylon-11 and
their filament-forming copolymers; e.g., nylon-6/66,
nylon-6/610/66, etc.; polyesters derived for example
from terephthalic acid or derivatives thereof . . . .
With an appropriate molten polymer distribution system
the spinneret herein can be used to produce multi-
component
filaments having an eccentric arrangement of dissimilar
polymers. The actual dimensions of the openings and ball
depend, of course, upon the characteristics of the
polymer,
the filament size or denier, the spinning speed, the
temperature, and other factors in the particular spinning
process.
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