Page 42 - TEXtalks March/April 2022

43
Resource-saving in Textile Processing
Successful Webinar
Over 600 delegates from 58 countries subscribed to
the latest VDMA textile machinery webinar on
sustainable dyeing held in February, 2022 – a record
since the monthly online series started in June 2020. Engineer Jonas Beisel observed that the current
The webinar, entitled ‘Resource-saving in Textile
Processing – Continuous Dyeing and Washing’,
involved the three companies Monforts, DyStar® and
Goller.
March/April 2022
In outlining the capabilities of Monforts Thermex
hotflue lines for the Econtrol® continuous dyeing
process, the company’s Textile Technologies
industry focus is very much on cleaner processes
and products in accordance with the Corporate
Social Responsibility (CSR) commitments of the
major fashion brands, and with further regulations to
be expected.
“It is clear the textile industry has to adjust to this dyeing processes such as Econtrol®, Cadira®
situation through new investments that enable a Continuous and CPB knit. In these processes Sera®
significant reduction in resource consumption to be auxiliaries are also employed for optimised wash-off
achieved, but are easy to integrate into existing results.
production systems, and Econtrol® lines fit the bill,”
he said. Guido Seiler, Area Sales Manager at Fong’s Europe,
also introduced the latest developments of the Goller
Cellulosics brand for the washing process, which can reduce
Econtrol® is a continuous process for the dyeing of water consumption by between 10 to 20%, as well as
woven cellulosic fabrics that has already been well reductions in both heating energy and waste
proven on the market, with over 150 Monforts generation, depending on the specific fabric
Thermex lines already in operation at mills worldwide. construction and required shade.
Reactive dyestuffs are fixed into the fabric in a “The Goller Sintensa Cyclone has a unique washing
one-step dyeing and drying process with a controlled mechanism which is not affected by the fabric
combination of steam and air. The entire pad-dry speed,” Seiler said. “The concept of the line is based
process takes just two-to-three minutes at a on a programmable washing action – from low to
temperature of between 120-130°C and a relative very high – and on a washing effect independent of
humidity volume of 25-30%. the fabric speed, with simultaneous gentle fabric
transport. The continuously adjustable speed of the
“The parameters for fixing reactive dyes are the internal rotor causes on one hand an overpressure
temperature, the duration and the alkali content, but which presses the liquor through the transport drum
reactive dyes need a certain temperature in order to and the fabric and on the other hand an
be fixed quickly,” Beisel said. “The Monforts solution underpressure which sucks the liquor through the
is to raise the so-called “wet bulb temperature” inside fabric and transport drum. This interaction ensures a
the dyeing chamber with steam. This ensures the very good and intensive flow of the washing liquor
surface of the fabric is heated up to a stable through the fabric on the drum and results in a very
temperature of around 68 degrees before being high washing effect, independent of the fabric
increased as the residual moisture of the fabric is speed.”
drawn away.”
The Goller Effecta module has been developed to
Benefits meet customer requests for a lower space
The Econtrol® pad-dry process has a number of requirement, as well as low liquor content to optimise
immediate benefits. Compared to the common the use of water.
pad-dry-pad-steam process, no salt is used and no
steamer is required for a separate fixation step. “The smaller distance between the upper and bottom
roller helps the system to reduce edge curling on
Compared to the pad-dry-thermofix process, no urea non-dimensional stable articles and additionally, the
is used and no smoke or deposits are generated,
Thermplate heating system ensures a good, even
and unlike with the cold pad batch process, direct
and effective heating of the liquor inside the
feedback of the dyeing results ensures no batching compartment,” Seiler explained, adding that the
time is necessary and guarantees good
washing process comprises three separate steps –
reproducibility from the lab to bulk production.
surface cleaning, soaping and rinsing and
neutralisation with final rinse. “Depending on the
An immediate wash off is also unnecessary, allowing requested fabric speed, different washing
for flexible production planning. The process is compartments are required. During surface cleaning
suitable for pale to dark shades with very good the main target is to remove the unfixed dyestuff from
fastness properties. the fabric by high washing action. The Goller solution
for this process is the Sintensa Cyclone, whereas the
Complementary services and systems Effecta is employed in the other steps where more
Complementing the Monforts presentation during the time is required to achieve the required result.”
webinar, Bertram Seuthe, Global Business
Development Manager at DyStar, outlined the Econtrol® Levafix®, Remazol®,Dianix®,
importance of specific Levafix® /Remazol® reactive Cadira®,Sera® are registered trademarks of DyStar
dyes and Dianix® disperse dyes for sustainable Colours Distribution GmbH, DE.
March/April 2022