USTER®
HVI 900
Instruction Manual
Uster Technologies, Inc..
Chapter 9
Version 4.0 (1.99) HVI Applications - Page 9-4
The next graph shows the influence of yarn strength, as well as yarn
strength CV%, on the weaving end breaks. Higher speed weaving
machines need yarn that is not only stronger but also yarn that has a
better yarn strength CV%. This improvement in CV% is needed to
reduce the strength variation and reduce the number of weak places in
the yarn.
According to research, a correlation between many fiber and yarn
properties exists. For ring spun yarns, one can see that neps, trash and
fiber fragments influence yarn imperfection values the most. This is
because of the yarn construction, which causes foreign matter to be on
the exterior of the yarn core. For rotor spun yarns, it is evident that neps,
trash and fiber fragments influence imperfection values and breaking
tenacity. Again, this is due to the construction of rotor spun yarns, where
foreign particles and neps tend to be on the inside of the yarn core.
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