Appeal No. 1997-1218
Application No. 08/268,687
lengths. As described in the specification at page 3, lines
24 through 33, glass fibers, obtained at the spinning stage,
are cut directly and, without previous drying, are ground to
milled glass fibers in a mixer defined as having a Froude
number much greater than 1, with the addition of liquids, such
as water and then dried. The formula for calculation of the
Froude number is given at page 4, line 15 of the specification
and appears in appealed claim 14, which representative claim
is reproduced below:
14. A process for the manufacture of milled glass
fibers having an average length of about 100 to 400
Fm, an apparent density of about 1 to 0.2 g/cm and a3
diameter of 10 to 14 Fm comprising spinning glass
fibers into bundles, cooling said bundles with water
to form wet bundles, directly cutting such wet
bundles, without previous drying, grinding said cut
wet bundles to milled glass fibers in a solid mixer
with a Froude number Fr of
R W2
Fr= ____________________>>1
g
where R = radius of the mixing elements in the mixer,
W = angular velocity of the mixing elements, and
g = gravitational acceleration
2
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