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Excessive short fiber affects yarn quality and spinning performance
As an option, the Fibrograph 910 measures the short fiber content of cotton
simultaneously with length and strength-adding another factor in the analysis of cotton
before its introduction into the spinning process.
Software allows you choice of the units in which measurements are made
Results in inches or millimeters and either span length or USDA modified upper-
half mean length measurements may be chosen. Strength measurements are available on
either the Pressley or Stelometer level on a 1/8-inch gauge basis. When two samples from
one bale are tested, the operator may request an automatic indication of a two-sided bale,
which would be accompanied by a request for a retest. Special calibration and calculations
for man-made fiber testing are available; man-made fiber measurements include modulus,
crimp factor and work (the area under the stress-strain curve). Finally, measurements of
length uniformity and total elongation are taken for every sample tested and fibrograms
and stress-strain curves may be plotted for any sample.
The Fibrograph consist of a brushing mechanism, an optical system for
measuring a fiber sample’s mass and length
and a clamping jaw system that measures strength
The instrument is accompanied by a Fibrosampler and Fibrocombs that are used in
preparing test samples. Once a fiber sample is prepared and presented to the Fibrograph,
the operation of the instrument is automatically controlled by microprocessors. First the
automatic brushing mechanism removes loose fibers and parallels the fibers in the sample.
The brushing is controlled with constant brushing speed, pressure and duration. The brush
itself is automatically cleaned and doffed by vacuum after every brushing cycle. After a
sample is brushed, it is transported by a mechanical finger to a traveling comb holder,
which presents it to the optical and clamping systems. Next, the sample is presented to the
fixed lens where the mass of the sample beard is determined by drawing the beard into a
narrow beam of monochromatic light absorbed by the beard’s individual fibers. From this
mass distribution, length and length uniformity are calculated. This optical system
eliminates the timeconsuming task of physically weighing each sample and it
simultaneously impoves accuracy. In addition, the optical system has contributed to the
Fibrograph’s high ratings for precision and repeatability in recent evaluations by the
United States Department of Agriculture (USDA).
Excessive short fiber affects yarn quality and spinning performance
As an option, the Fibrograph 910 measures the short fiber content of cotton
simultaneously with length and strength-adding another factor in the analysis of cotton
before its introduction into the spinning process.
Software allows you choice of the units in which measurements are made
Results in inches or millimeters and either span length or USDA modified upper-
half mean length measurements may be chosen. Strength measurements are available on
either the Pressley or Stelometer level on a 1/8-inch gauge basis. When two samples from
one bale are tested, the operator may request an automatic indication of a two-sided bale,
which would be accompanied by a request for a retest. Special calibration and calculations
for man-made fiber testing are available; man-made fiber measurements include modulus,
crimp factor and work (the area under the stress-strain curve). Finally, measurements of
length uniformity and total elongation are taken for every sample tested and fibrograms
and stress-strain curves may be plotted for any sample.
The Fibrograph consist of a brushing mechanism, an optical system for
measuring a fiber sample’s mass and length
and a clamping jaw system that measures strength
The instrument is accompanied by a Fibrosampler and Fibrocombs that are used in
preparing test samples. Once a fiber sample is prepared and presented to the Fibrograph,
the operation of the instrument is automatically controlled by microprocessors. First the
automatic brushing mechanism removes loose fibers and parallels the fibers in the sample.
The brushing is controlled with constant brushing speed, pressure and duration. The brush
itself is automatically cleaned and doffed by vacuum after every brushing cycle. After a
sample is brushed, it is transported by a mechanical finger to a traveling comb holder,
which presents it to the optical and clamping systems. Next, the sample is presented to the
fixed lens where the mass of the sample beard is determined by drawing the beard into a
narrow beam of monochromatic light absorbed by the beard’s individual fibers. From this
mass distribution, length and length uniformity are calculated. This optical system
eliminates the timeconsuming task of physically weighing each sample and it
simultaneously impoves accuracy. In addition, the optical system has contributed to the
Fibrograph’s high ratings for precision and repeatability in recent evaluations by the
United States Department of Agriculture (USDA).
