USTER®
HVI 900
Instruction Manual
Uster Technologies, Inc..
Chapter 13
Version 4.0 (1.99) Fibrosampler - Page 13-3
3.6 Theory of Operation
Sample beard preparation is a critical step in any scientific test
procedure that strives to achieve statistically valid and repeatable
results. The Fibrosampler 192 selects a random sample by presenting
to the Fibrocomb a series of small staggered tufts. These are created by
the hole pattern in the sample plate against which the fiber is pressed.
The result is that the comb does not select fiber only at the point of initial
contact with the sample, but it continues to select fibers from each tuft as
it passes over the entire sample.
The sample beard is cleaned of loose fiber and combed by the card
cloth. The card cloth is positioned at a gradually decreasing distance
from the Fibrocomb as it passes. This ensures the gradual cleaning and
parallelization of the sample while minimizing fiber damage.
The Fibrosampler is responsive to operator technique, allowing an
experienced technician to use variations in hand opening and pressure
against the sample plate to achieve consistent high-quality sample
beards. The technician's recognition of a given sample's need for
opening and quantity of pressure, along with the ability to inspect and
add fibers in additional passes, ensures control of the sample beard
quality.
The Fibrosampler 192 is mechanically simple and durable. It will
produce top-quality samples for the testing of span length, length
uniformity, and strength.
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