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for off-standard micronaire and since contracts are written-based on micronaire
specifications. With the Fibrofine 920, the modern mill can check each bale of incoming
cotton to verify that suppliers deliver the quality of cotton that was purchased.
Fineness tests are conducted by a Fibrofine, which cosists of a balance, a
microprocessor and mike chamber. Spinlab uses the Swiss-made Mettler balance to
determine a sample’s mass, which may fall between 9.5 and 10.5 grams.
Fiber fineness is determined by passing a metered air stream through
a known mass of fiber confined in a chamber of known volume.
The pressure differential across the chamber is then related to the specific surface
area of the fiber. The measurement of specific surface determines the micronaire value for
cotton. Test results are shown on the display screen. When the Fibrofine operates in
conjunction with the Fibrograph in measuring fiber strength, the micronaire value of
cotton becomes an important factor in the refined fiber strength value.
Variable weight micronaire testing offers greater latitude
than ever before available in weighing the sample.
Any amount of fiber between 9.5 and 10.5 grams will produce an accurate result, so
the user avoids the time-consuming process of selecting a specified weight of fiber.
Another innovation, the tilted mike chamber on the instrument’s table top, enables an
operator to check that a sample is completely ejected and permits effortless placement of
samples into the chamber. Sample compression from the bottom of the chamber eliminates
the safety problems associated with an overhead piston.
The Fibrofine’s reliability is ensured by use of a Swiss-made
Mettler balance and a sample that is more than three times
as large as those used by older air-flow devices.
The large sample size increases accuracy by producing results that are more
statistically representative of an entire bale than those produced by other instruments.
Automatic, computer-controlled calibration schemes, warning messages in case of drastic
shifts in pressure or component failure and ambient pressure as reference also contribute to
the stability of the measuring device.
The mike chamber is tilted on the console to enable easy placement of samples
inside the chamber and quick checks to insure that a sample is completely ejected.
Length and Strength Testing
Length and strength testing is performed on the Fibrograph, which is located in the
left console. The Fibrograph 910 measures five fiber properties that account for over half
of the explained variation in yarn spinability - length, uniformity, short fiber, strength and
elongation. These properties are critical in making decisions concerning cotton
purchasing, the assignment of bales to a particular laydown and the setting of draft roll
spaces.
for off-standard micronaire and since contracts are written-based on micronaire
specifications. With the Fibrofine 920, the modern mill can check each bale of incoming
cotton to verify that suppliers deliver the quality of cotton that was purchased.
Fineness tests are conducted by a Fibrofine, which cosists of a balance, a
microprocessor and mike chamber. Spinlab uses the Swiss-made Mettler balance to
determine a sample’s mass, which may fall between 9.5 and 10.5 grams.
Fiber fineness is determined by passing a metered air stream through
a known mass of fiber confined in a chamber of known volume.
The pressure differential across the chamber is then related to the specific surface
area of the fiber. The measurement of specific surface determines the micronaire value for
cotton. Test results are shown on the display screen. When the Fibrofine operates in
conjunction with the Fibrograph in measuring fiber strength, the micronaire value of
cotton becomes an important factor in the refined fiber strength value.
Variable weight micronaire testing offers greater latitude
than ever before available in weighing the sample.
Any amount of fiber between 9.5 and 10.5 grams will produce an accurate result, so
the user avoids the time-consuming process of selecting a specified weight of fiber.
Another innovation, the tilted mike chamber on the instrument’s table top, enables an
operator to check that a sample is completely ejected and permits effortless placement of
samples into the chamber. Sample compression from the bottom of the chamber eliminates
the safety problems associated with an overhead piston.
The Fibrofine’s reliability is ensured by use of a Swiss-made
Mettler balance and a sample that is more than three times
as large as those used by older air-flow devices.
The large sample size increases accuracy by producing results that are more
statistically representative of an entire bale than those produced by other instruments.
Automatic, computer-controlled calibration schemes, warning messages in case of drastic
shifts in pressure or component failure and ambient pressure as reference also contribute to
the stability of the measuring device.
The mike chamber is tilted on the console to enable easy placement of samples
inside the chamber and quick checks to insure that a sample is completely ejected.
Length and Strength Testing
Length and strength testing is performed on the Fibrograph, which is located in the
left console. The Fibrograph 910 measures five fiber properties that account for over half
of the explained variation in yarn spinability - length, uniformity, short fiber, strength and
elongation. These properties are critical in making decisions concerning cotton
purchasing, the assignment of bales to a particular laydown and the setting of draft roll
spaces.
