Page 54 - TEXtalks October/November 2021

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Drawing fibers to perfection: Godet rolls made

in Switzerland meet topmost expectations

The popular phrase ‘hanging by a thread’ really
means something in yarn applications for
protective wear, as well as in medical,
automotive and aviation. Man-made fibers for
these sectors have to fit specifications precisely,
to be on the safe side for both producers and
end-users – and Retech develops godet rolls as
the key manufacturing components to ensure
these standards are met.
Swiss Review These threads – some literally life-saving – are made temperature profile of +/- 1.5 °C over the whole
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working width of the godet roll.
of polyamide, polyester, polypropylene, aramid,
carbon, bio-based and many other polymers,
Reaching to the limits of strength boundaries
categorized as technical yarns and high-performance
“We continuously touch today’s technical limits and
fibers. Retech is the expert, backed by over 45 years
of experience, in heat treatment and drawing
We take the risk, and try to optimize at the edge,”
man-made fibers of any material. The Swiss
says von Arx. The new type Ø 320 mm, specially
company launched two innovative godet rolls lately: stretch to tomorrow’s possibilities when developing.
the Ø 250 mm model developed for technical yarns developed for high-performance fibers, has become
and the Ø 320 mm model, reaching out to today’s Retech’s latest pride, and evidence of its efforts to
temperature conditions, as needed for support today’s yarn engineering ideas.
high-performance fibers such as aramid.
Featuring various length, this type is ideal for
High-tech for a secretive business serpentine yarn paths to multi-enlacement, and suits
“Comparing required customized solutions shows us practically all machine concepts and yarn paths. For
trends regarding the market demand for godet rolls. high-performance fibers it’s essential to optimize heat
It becomes our ambition to innovate the one godet entry into the yarn, so the first step must be to extend
roll meeting these latest customer needs,” says the dwell time, which in turn is influenced by speed
Ralph von Arx, CEO, Retech AG. and diameter. The top diameter of Ø 320 mm allows
the number of revolutions per minute to be reduced,
Identifying a strong demand for technical yarns with resulting in optimum dwell time – while taking the
maximum strength, Retech addressed this with the advantage of an enlarged contact area. Unique yarn
newly-launched type Ø 250 mm roll, with an ideal characteristics are made possible by impressive
length of 420 mm to process eight or twelve threads temperatures up to 400 °C, along with torque values
at a time. The extended diameter of 250 mm allows a of 35 Nm and speeds up to 1500 m/min.
significantly higher speed with the same dwell time.
Additionally, the higher motor torque guarantees the Until the ultimate
very best results in yarn tenacity. The culture of ongoing enhancement and the desire
for perfection make Retech a reliable partner when it
Further technical parameters are as remarkable: comes to yarns for challenging – and especially
speed can be ramped up to 6500 m/min – applying a life-saving – applications. “Producers can rely on us.
torque value of 15 Nm through the full speed range – We never stop until we can draw our customer’s
and the temperature reaches 250°C with an excellent fibers to perfection,” says von Arx.

October/November 2021