Appeal No. 95-2622
Application 08/125,524
l. 46-61). The polyester filaments “are prepared by melt-
spinning filaments of higher denier and then drawing by known
methods to produce filaments with denier in the required
range” (McKay (‘363), col. 5, l. 8-11). McKay (‘363) teaches
(McKay (‘363), col. 5, l. 15-20):
The drawing operation may occur after melt-spinning as a
separate step or may be part of a coupled spinning and
drawing operation as in Example 1. [On the other hand,
the drawing may be done as part of a unitary draw-
texturizing process as in Example IX. If one elects
a “simultaneous” draw-texturizing process, partially
oriented yarn is passed over a hot plate where it is
both drawn and false-twisted.
McKay (‘363) indicates (McKay (‘363), col. 5, l. 33-44;
emphasis added):
While [draw] ratio may vary according to tension and
other
factors, the maximum . . . ratio (R) of output-to-input
speed in the draw-texturing operation which is operable
without excessive filament breakage is established by
testing the feed yarn under a number of draw-texturing
conditions. For high-speed spun partially oriented
filaments, the ratio (R) is between 1.2 and 2. For slow
speed spun partially oriented yarns, the ratio may be as
high as 6. For so-called drawn yarns which are highly
oriented, the maximum ratio may be as low as 1:1; in
practice, such drawn yarns may be overfed to the machine
to give an actual operating ratio as low as 0.90.
The respective minimum and maximum diameters of the orifices
used to melt-extrude the oriented polyester monofilaments
- 14 -
Page: Previous 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Next
Last modified: November 3, 2007