USTER®
HVI 900
Instruction Manual
Uster Technologies, Inc..
Chapter 9
Version 4.0 (1.99) HVI Applications - Page 9-9
6 Using HVI Cotton
Merchandising
6.4 Invention of Fiber Testing
Instruments
During the 1940’s, several innovations in fiber instrumentation were
developed. These include the micronaire, which estimates fineness; the
Spinlab Hunter-Nickerson Cotton Colormeter; the Pressley and Spinlab
Stelometer, which estimates fiber strength; and the Spinlab Fibrograph,
which estimates fiber length. In 1982, cotton was subjected to length
measurements by the Suter-Webb Fiber Sorter and, if found to have
proper length, selected cotton was used to produce the official
standards. For the past 30 years, staple length standards have
remained amazingly constant as verified by the Suter-Webb Sorter and
the Uster Fibrograph.
6.5 Using the Fibrograph
The Fibrograph has long been established as the instrument to measure
fiber length for purchasing and setting machinery in the spinning mill
based on a combination of visual and quantitative analyses.
A fundamental principle of marketing is to put yourself in the place of
your customers and to consider problems from the customer’s point of
view. The most common problem to all cotton spinners is the desire to
purchase fibers that will allow them to select even running nixes.
Although we cannot physically change the fiber characteristics in bales,
we can group bales together so that they may spin consistently. This
concept is generally termed by the spinning mill as bale management.
Upon testing several bales for fiber length, one will quickly see a
distribution. In other words, there will be an average with bales below
or above that average.
To Next Page
Loading...
