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Abstract:
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As textile weaving operations strive to obtain world
class manufacturing status, the need for higher weaving
efficiencies and better yarn quality is required today more
than ever before. Weaving machine speeds are increasing
with advances in technology and along with this comes an
increase in machine price. Therefore, higher machine
efficiencies are required to cover machine cost. Although
this is an overview of what weaving operations are
encountering today, increases in machine speeds place
tremendous tension on both warp and filling yarns. These
tensions break yarns and as a result, weaving efficiencies
are lowered because of machine downtime. To eliminate
machine downtime related to insufficient yarn strength,
weaving operations will have to slow down their machinery
or use yarns of higher quality.
Therefore, the objective of this thesis was to reduce
filling yarn stops by coating the yarn with size. In
addition to coating filling yarns, determine the optimum
size pick-up level that would produce maximum weaving
efficiency. The final objective of this thesis was to
determine whether it was economically feasible to size
filling.
Yarns of varied structural compositions were used to
assess the effect of various size pick-up levels and
tension on filling yarns. The Dornier Rigid Rapier machine
at the Institute of Textile Technology was used as a sample
loom for testing the theories of this thesis.
Results of accelerated weaving (five times the normal
tension) tests based on filling stops per ten thousand
picks were used as an indication of weavability.
Conclusion drawn from the results of this experiment
were as follows:
1. Variations in size pick-up levels have various
affects on weavability of different spun yarns.
2. There were few filling stops for Murata Air-Jet and
Open-end yarns at 4% size pick-up. Ring yarns
on the other hand, had few stops at 6% pick-up.
Four and six percent appeared to be the best size
levels for Open-end and MJS yarns during this
research.
3. Size reduces filling stops; however, it is not
economically feasible to size filling for an entire
weaving operation. Under special circumstances
where filling stops are excessive because of
insufficient yarn strength, sizing filling may be
practical.
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