Technische Mitteilung
Technical News
EliTe®CompactSet - Modernization of Ring Spinning Frames
with the EliTe®Compact Spinning System
1. General Situation rule, machines processing carded material require
more maintenance.
The EliTe®CompactSet for the production of com-
pact yarns of superior quality has been generally If not enough attention is paid to these fundamental
accepted on the market after a very short time. criteria, the inevitable results are unsuitably operat-
Spinning results have come up to our and our ing spinning positions, damaged lattice aprons and
clients’ expectations and have often surpassed an increased tendency towards lapping at the
them. The advantages achievable with EliTe Yarns ® EliTop.
in subsequent processing and in woven and knitted Cleaning cycles depend on raw material, yarn
end-products are exactly what customers imagined count and other parameters. Our customers’
and allow them to draw further benefit from this cleaning cycles differ from 2 to 4 weeks.
spinning method. EliTe® has proved to be the most
It is recommendable to combine the cleaning
flexible Compact Spinning System. Easier handling
process with a prophylactic change of the lattice
and maintenance also speak in favour of the
aprons. Lattice aprons removed from EliTubes can
EliTe®CompactSet.
be prepared for a further use on the machine after
The EliTe®Spinning System has now been used in sorting out of damaged aprons and a simple
industrial practice in many countries under very cleaning procedure (see item 3).
different conditions and the experience made has
Depending on ambient conditions like dust content
resulted in a series of general findings and techni-
of the air, in particular of siliceous particles, fibre
cal improvements.
material, yarn count, delivery speed and finally
The following essay will summarize the most cleanliness of the machine, lattice aprons have an
important information. maximum operating life between 7 and 14 months.
Fine dust can settle at the fans of the EliVAC
2. Cleanliness of the Machine system, whose function is not affected, however,
provided they are cleaned every 3,500 or 4,000
Although machines modernized with the EliTe®
operating hours at the latest.
Compact Spinning System create much less fly
than standard ring spinning frames, they act like a In any case, a prerequisite for putting a modernized
“vacuum cleaner” due to the negative pressure machine into operation is a perfectly set travelling
applied at the lattice aprons and attract dust and fly blower. SUESSEN has co-ordinated the position
from the surrounding and adjacent machines. It is and design of blowing nozzles with all renowned
therefore advisable to install modernized machines manufacturers of travelling cleaners. Of particular
in separate rooms from standard ring frames, or to importance is a special nozzle, only applied in
separate them at least by a curtain. Consequently, EliTe® Spinning, to keep the drafting system clean,
the conditions are quite similar to rotor spinning especially the EliTops. It blows onto the drafting
machines, which for the same reason should not be system from behind at an angle and thereby
installed together with ring spinning frames. prevents that the fibre strand on the lattice apron is
diffused.
The length of cleaning intervals of modernized
machines depends decisively on the contamination
of ambient air with fibres and dust particles. As a
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3. Cleaning of Lattice Aprons 5. General Operating Instructions
As a rule, it is sufficient to clean lattice aprons with EliTe®machines permit to achieve very low ends-
compressed air. If cotton containing honeydew, down rates. This may invite some spinning mill
core yarns or wool are processed, the aprons must manager to precipitately increase the number of
be cleaned with an ultrasonic cleaning device. machines to be supervised per operator disregard-
ing the fact that the percentage of “inspection and
We recommend portable ultrasonic cleaning
control activities” is slightly higher. For example,
devices with a content of about 20 litres, with which
hunchback cops should not only be pieced-up as a
approx. 1,000 lattice aprons can be cleaned at a
matter of routine, but they must be removed from
time. Such devices cost about EUR 1,300.— and
the machine, and after repairing the defect, a new
are offered for example by
tube must be placed and pieced-up.
· BRANSONIC, M/s. Heinemann,
Possible malfunction causes:
Schwaebisch Gmuend, phone No. 07171/
61142 or · Defective lattice apron
· POWERSONIC P 2666 S/R, M/s. Erdmann, · Accumulation of fly between lattice apron
Iserlohn, phone No. 02371/944800. and EliTube (check lattice aprons for smooth
running)
The following should be observed for washing and
drying: · Fibre accumulations in the area of the guide
rod (use your finger to check whether there
· ultrasonic intensity 60 to 80%
is enough play)
· air-drying of aprons; do not use a tumbler
· Defective cot of the front top roller due to
(risk of shrinkage)
laps (use your finger to check cot when
EliTop is running)
4. Room Conditions
· Defective traveller (this may happen in
We have learned that room conditions have an
particular during the last shifts before chang-
important influence on the frequency of roller laps
ing the travellers)
on the EliTop. Air change > 33 per hour is
recommendable. It is our experience, that the · General malfunctions known from ring
absolute water content of the air should not exceed spinning, such as: incorrect centering,
11 g/kg. This leads to the following temperature defective roving, clogged suction tube etc.
and relative air humidity range: In addition, care should be taken right from the start
Relative air humidity: 40 to 60% that roving packages should be changed before the
drafting system runs without roving. This will avoid
Temperature: 32° to 23° C
unnecessary fly due to clogged suction tubes and
We want to point out again, that maintaining of serial ends-down, and the top weighting arm need
these conditions alone is not sufficient, but that not be opened for placing a new roving.
general cleanliness of the spinning room, as well as
As a general rule, the top weighting arm should not
fibre and dust content of the air are of equal impor-
be closed rapidly when placing the roving in the
tance.
drafting system.
Due to the air current, the roving will not remain in
the centre of the roller. Lapping between outer ring of
the top rollers and the EliTop housing can be the
result.
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6. EliTube / Lattice Apron 6.3 Damaged Lattice Aprons due to Inexpert
6.1 Negative pressure Mounting
It is admissible to dismantle and reinstall the
The negative pressure that can be measured at the
EliTube with lattice aprons when the machine is
suction slot of the EliTube is can be learnt from the
running. However, care must be taken that prior to
chart below. Deviations not exceeding ± 3 mbar
reinstalling the EliTube the lattice aprons are
between the spinning positions are of no influence.
positioned exactly in the recesses of the guide rod.
Short-staple fibres (6 or 8 spindles per box length)
Otherwise there is a risk that the lattice aprons are
Vacuum Lattice Apron Slot Design Application
clamped temporarily between the guide rod and the
26 mbar 959.3164 without Delta combed
24 mbar 959.3164 with Delta carded rotating fluted bottom roller and get damaged. In
20 mbar 959.3164 without Delta EliTwist®* extreme cases, the fabric is distroyed and small
20 mbar 959.4920 without Delta core-yarn holes are produced. (See Figure below)
Long-staple fibres (6 spindles per box length)
also
20 mbar 959.4920 without Delta
core-yarn
16 mbar 959.4920 without Delta EliTwist®*
* Slot width 1.3 mm SH50789B
We have made the experience that spinning results
are not improved by increasing this negative
pressure with a higher fan speed, but that this will
only increase the energy consumption.
6.2 Traverse motion
The traversing stroke of the roving should be set at a
maximum of 4.5 mm.
SH50712
It is recommended to check this setting carefully
during general cleaning or the like to ensure that no
7. EliTop / Buffing of Cots
deviation exists between the spinning positions.
Inappropriate conditions like fibre fly and room
2 mm 2 mm
climate can result in increased lapping at the
delivery top roller of the EliTop, finally blocking the
Form A Form B
whole EliTop. The cot of the top roller lying on the
front fluted roller can be downright milled off and
needs to be replaced.
EliTops with laps at the delivery top roller should be
replaced without exception. For this purpose, the
operator should always have a new EliTop with him.
The replaced EliTop is checked and repaired in the
2 1 SH50550e
Form A - carded cotton workshop. Only these measures will ensure that no
Form B - long-staple, combed cotton, bad yarn quality is produced by an EliTop with
core-yarn, worsted yarns
X - Traversing stroke defective cot.
1 - Wear-resisting insert
2 - Plug
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Of great importance to the functional reliability of the 8. Spinning Rings/Travellers
EliTe®CompactSet is that the lattice apron is safely
The compact structure of EliTe®Yarns and the
driven by the delivery top roller. For this reason,
significantly reduced number of fibres over 3 mm
the cot of this roller must have a Shore hardness
standing out from the yarn is the reason why it is
of about 65°. Cots with hardness over 70° Shore
much more difficult - compared with conventional
and cots with Berkol treatment can affect the
ring yarns - to build up the lubricating film between
spinning process.
ring and traveller. This should be taken into consid-
Our customers buff the cots after 1200 to 1600 eration when selecting rings and travellers, for the
hours. The corresponding replacement at the running-in period of rings and change cycles of
EliTe® Machine is usually done while the machine is travellers.
thoroughly cleaned.
With the ring/traveller combinations available up to
The diameter is reduced by not more than 0.3 mm. now the service life of travellers known from con-
Roughness after buffing should be approx. Ra = ventional ring spinning has not yet been reached. In
0.9. In order not to change the chosen tension draft some cases, the maximum traveller speeds for a
of the EliTop after buffing, the diameter ratio of the given material may be up to 10% lower when
two top rollers must be calculated again after each producing EliTe®Yarns.
buffing. Suitable charts can be found in the manual.
Studies of manufacturers of rings and travellers
It is recommendable to mark all EliTops of one
have not yet been completed in this respect, so we
buffing interval with the same colour.
can expect that soon such restrictions will be
minimized or eliminated.
Tension Drafts
The tension draft set through the top roller cot 8.1 Ring / Traveller Combination
diameters of the EliTop has a decisive influence on
We recommend spinning rings with antiwedge or
the spinning results. The tension drafts differ in
asymmetrical profile for high delivery speed and
accordance with the fibre material applied.
superior quality.
We recommend:
The space between traveller and yarn should
Short-staple fibres definitely be narrower to facilitate build-up of the
• Cotton 1.065 lubricating film. Good results are obtained with the
• Synthetic fibres and their blends with cotton C1 EL udr for finer yarns (> Ne 50), and C1 UL udr
1.025 for coarser yarns or El 1hft.
Long-staple fibres For lower traveller speeds of up to max. 28 m/s, i.e.
for coarse yarns or core yarns, rings with a lower
• Wool 0.975
quality level may be used, too. In addition, please
• Synthetic fibres 1.00
note that the cleaning settings mentioned in the
• Blends of wool and synthetic fibres 1.00
manuals of ring manufacturers can be chosen 0.1 to
If there is a frequent change between these three 0.2 mm closer.
materials or blends respectively, the best compro-
The ORBIT system is suitable in individual cases
mise is a tension draft of 0.975.
only. For further questions, please contact a re-
This proposal does not exclude that different tension nowned ring/traveller manufacturer.
drafts can have better results in certain applications.
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8.2 Running-in Periods of Rings This gives the impression that the yarn twist has
been increased. But there is an explanation to this
Utmost care should be taken regarding the running-
effect:
in of rings. Ring manufacturers’ recommendations to
reduce or to even cancel the running-in period for · Due to a different interior structure, the
their coated high-performance rings should not be interfibre friction is higher in EliTe®Yarns.
followed when processing EliTe®Yarns. This has an influence on the twist testers
which are operating by the method of
The following procedure has shown good results:
untwining and twisting.
Traveller change after:
· This different structure is due to the virtual
1h 75% of desired max. spindle speed )** elimination of the spinning triangle. When the
3h 0,9 twist enters the yarn, peripheral fibres and
6h 0,9 core fibres are not exposed to uneven tensile
12 h 100% of the desired max. speed, using stress. The interior yarn structure is more
the running-in program of the machine
homogeneous, fibre parallelization is better.
after each change
EliTe®Yarns, compared to conventional ring
12 h
24 h yarns, have an increased tendency to
24 h snarling, i.e. the yarns are more “lively”.
48 h
Lighter pre-tensioning weights should be used.
48 h
72 h
72 h
120 h
)** after one hour use a dry cotton cloth
to clean the rings
SH50551B
8.3 Traveller Change
Depending on raw material, twist and traveller
speed, the service life of a traveller actually is
between 200 and 300 hours.
It has proved to be of advantage, that the spindle
speed after changing the traveller must be reduced
for a longer period than in conventional ring-
spinning to build up a sufficient lubricating film.
9. Remarks on Checking and Setting of
Yarn Twist
When using twist testers to check the yarn twist,
the values of EliTe®Yarns are by 5% higher than
those of conventional ring-spun yarns without
changing the gearing ratio.
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