|
The RoCoS compact spinning system, developed by Hans Stahlecker
of Rotorcraft Maschinenfabrik, Switzerland, has been recently
introduced in Pakistan.
| Mr. Stahlecker is instrumental in the development
and introduction of the concept of Compact Spinning. After
parting ways amicably with the company that he founded decades
earlier he embarked upon the development of new technology
to produce Compact Yarn in his own company Rotorcraft Maschinenfabrik.
In a short span of three years different teams working simultaneously
but independently emerged with the |
Mr. Hans Stahlecker presenting RoCos,
Compact Spinning System |
practical solution RoCos for producing compact yarn for ring
spinning through a magnetic compacting system as against the
conventional compact yarn system which needs compressed air.
Mr. Stahlecker presented this new concept in two seminars held
in Karachi and Faisalabad. The seminars were organised by Investco,
representatives of Rotorcraft in Pakistan. In the Karachi session
the-then Zonal Chairman, APTMA, Mr. Omar Soomro was the Chief
Guest and Mr. Anjum M. Saleem the then Chairman APTMA was the
Chief Guest in Faisalabad
Following are the excerpts of the two presentations.
The Principle
Compact Yarn as explained by Mr. Stahlecker is produced by compacting
the strand of fiber in a condensing zone - arranged after the
drafting system - to such a degree so as not to allow the formation
of a spinning triangle while twisting the strand of fibers into
yarn. The undesirable yarn hairiness and the reduction of yarn
strength resulting therefrom are thus avoided.
Until now, the condensing of the strand of fibers is brought
about by air suction. The power required to produce this suction
is substantial, the pneumatic compacting devices are expensive,
and may require elaborate maintenance. RoCoS, the Rotorcraft
Compact Spinning System, works without air suction and uses
magnetic mechanical principles only.
The bottom roller 1 supports the front roller 2 and delivery
roller 3. The condensing zone extends from clamping line A to
clamping line B.
The very precise magnetic compactor 4 is pressed by permanent
magnets without clearance against cylinder 1. It forms together
with the bottom roller an overall enclosed compression chamber
whose bottom contour, the generated surface of cylinder 1, moves
synchronously with the strand of fibers and transports this
safely through the compactor.
According to Mr. Stahlecker RoCoS 1 is suitable for cotton,
pure and as blends with synthetic fibres, as well as for pure
synthetics with a maximum staple length of 60 mm (21/2 ").
On the other hand RoCoS 2 is suitable for wool, pure and as
blends with synthetic fibres as well as for pure synthetics,
having a minimum staple length of 50 mm (2").
In respect of yarn fineness and yarn twist, the standards usual
in the industry are applicable. Compactors for coarse, medium
and fine count yarns ensure ideal compacting.
The RoCoS device consists of cylinder 1, front roller 2, delivery
roller 3, the precision-ground and with Supra-Magnets equipped
ceramic compactors 4, the supporting bridge 5, the yarn guides
6 and the top roller holders 7 with the weighting spring 8.
|
RoCoS Device
The Design
The bottom roller has very precise flutes and its diameter
corresponds exactly to the radius of the compactor. RoCoS
is equally suitable for application in new machinery as
well as for retrofit introduction in existing machines.
The conversion of a standard ring spinning frame to RoCoS
can - as a rule - be undertaken by the mill maintenance
personnel without any problems.
Maintenance and operating instructions for high-drafting
systems as common in the industry today are equally applicable
for RoCoS.
According to Hans Stahlecker of Rotorcraft Maschinenfabrik,
RoCoS does not require an investment in new spinning machines.
The newly developed Compact Drafting System is available
as a draft zone retrofit to most of today's ring spinning
equipment.
Pakistan’s Textile Industry: Comments and Suggestions
Mr. Stahlecker commented that Pakistan should concentrate
on producing high quality of textile goods to remain competitive
in the future. He gave the example of the once vibrant
textile industry in the US that concentrated on the production
of mass
|
Mr. Saleem Habib of Investco, Mr.
Hans Stahlecker, Mr. Anjum M. Saleem and Mr. Muhammad
Arif of Investco
Mr. Stahlecker with the Chief Guest
Mr. Soomro, Mr. Idrees, the Textile Commis-sioner, the
Swiss Consul General, Mr. Julius F. Anderegg & Mr.
Arif of Investco
The audience at the Seminar in Karachi
Mr. Hans Stahlecker and Mr. Werner
Hoeher of Rotorcraft with a guest
|
market lower quality products leaving the higher end textiles
to Europe. This factor contributed to the downfall of US textile
industry which is practically non existent today. Pakistan should
pay close attention to changing the image of a producer of low
quality textile products. He appreciated the dynamism and vision
of textile industrialists in Pakistan, who are now investing
heavily in the latest technology.
The technology was on display at Shanghaitex 2003 where many
leading industrialists from Pakistan saw the demonstration of
RoCos at the booth of Rotorcraft.
|
