|
Abstract:
|
With the latest increase in rotor speeds, the greatest opportunities for growth of
rotor spinning are available in spinning fine counts. Although the current generation
spinning frames are capable of speeds of up to 130,000 rpm, current production of
fine yarn counts (28/1 Ne) has been limited to between 100,000 and 110,00 rpm for
carded cotton. One of the factors that has prevented industry from spinning at higher
speeds is the quality of the feed sliver, in particular trash content.
The objective of this thesis was to determine the effects of the Hollingsworth
Lintmaster, a recently developed cotton cleaning machine, used in two different
cleaning configurations on sliver quality, and how that sliver quality translated into
yarn quality and spinning performance for Ne 28/1, 100% cotton open-end yarns spun
at rotor speeds of 105, 110, 115, and 120 thousand revolutions per minute. The first
cleaning configuration employed the Lintmaster as the primary cleaning machine,
whereas the second configuration utilized the Hollingsworth MasterClean as the
primary cleaning machine followed by the Lintmaster.
The Lintmaster removed less waste while achieving a card mat with 50% less
trash than the control, which was the Hollingsworth Lintmaster. However, the card
equalized the amount of trash in the card slivers, eliminating the benefit of improved
cleaning efficiency. Yarn quality and spinning performance for the stock cleaned on
the Lintmaster was similar to that of the control line.
|