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Ring
Com4®
ComfoRo®
ComforJet®
Fig. 6 Comparison
between the 4
different Rieter yarn
types: ring yarn,
Com4® compact yarn,
ComfoRo® rotor yarn
and ComforJet® air-jet
yarn.
During the development process, care was taken that
as many fiber materials as possible could be processed
with the same top roller cots. The previous
status of research and development with the aprons
is that for viscose, Modal, cotton and blends, the
same apron can be used. As top and bottom aprons
in the drafting arrangement are identical, fewer
aprons must be kept in stock as spares.
Low production costs per kilogram of yarn
For the majority of applications, the air-jet spinning
technology has a lower energy consumption per kilogram
of produced yarn than other spinning processes.
Rieter’s calculations take the energy requirement
for the compressed air preparation into account. The
intelligent shutdown of the individual spinning units
thereby pays off. The development process also paid
attention to the dimensions of the J 20, to ensure
that an installation in existing spinning rooms is possible.
A spinning plant with J 20 needs a 25% smaller
building area than a ring spinning plant for the same
production capacity. This reduces the cost for buildings.
A key for a perfect running behavior of the end
spinning machines is a stable climate. Here the 25%
lower space requirement of a J 20 compared to that
of a ring spinning machine is of financial benefit. The
smaller area that has to be air-conditioned results in
substantial savings.
LINK 58 . 2 /2011
PRODUCT NEWS
Practical experience has clearly shown that the airconditioning
in the spinning plant has a great influence
on the spinning quality and the production
stability with air-jet spinning. Under difficult conditions,
air-conditioning can be installed directly under
the spinning machine. It directs conditioned air
from below to the cans, i.e. to the sliver – exactly
where it is needed. Compared with the climatic conditioning
of a hall, such a system can save additional
energy.
ComforJet® yarn – noticeably different
A new yarn with new yarn characteristics, that opens
new market opportunities for spinning plants, was
the focus of development of the new spinning technology.
The development team has succeeded in
meeting this challenge. The type of yarn formation
– turbulence with an airflow in a spinning nozzle –
leads to a novel, noticeably different yarn structure.
This yarn from the J 20 machine is marketed under
the trade name ComforJet®. Air is a significant factor
in the formation of the ComforJet® yarn and influences
the yarn structure. For this reason, the ComforJet®
yarns differ from ring and rotor yarns (Fig. 6) and
have unique properties which show their advantages
not only in the processing but also in the end article
and end use.
ComforJet® yarn with defined hairiness
With the J 20 air-jet spinning machine, the hairiness
and the yarn volume can be changed and reproduced
via the machine setting. This flexibility is not found
with any other spinning system to this extent.
With the ComforJet® spinning process the drafted
fibers run into a spinning nozzle. The front part of
the fibers form the yarn core. The loose fiber ends
are wound around the parallel yarn core by the air
stream – it can be imagined as the fiber sun – in the
spinning nozzle (Fig. 7/Fig. 8). The yarn surface is
very smooth. The fibers that form the hairiness are
very short or form small loops. This produces the
typical properties of the ComforJet® yarn – very low
hairiness combined with a soft and voluminous yarn
character.
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