The Comparison, Measuring & Labelling of Energy-efficient Textile Machinery
“High performance and re-
source protection are indispens-
able over the entire life of a prod-
uct. Dyeing lines can now be
operated efficiently with ultra-
short liquor ratios and greatly
reduced energy consumption.”
Johannes Schmitz,
Head of Development,
THIES GmbH & Co. KG
Amongst the key parameters of dyeing lines in relation to
high energy and resource efficiency are :
-Type of machine
-
-Pre-treatment
Dyeing process
-
-Class of dyestuff
Colour depth
-
-After-treatment
Desired fastness requirementsThe user has a great influence on the energy and resource
consumption through the choice of suitable dyeing
processes and the process design. To list the individual
process parameters and the factors influencing these for
the dyeing process is beyond our scope here.In the dyeing process, the variety of processes is clear to
the extent that different equipment and machinery is used
for the different precursor products.
Due to the high energy consumption of the dyeing process,
there is a growing tendency to use heat recovery for
subsequent or parallel processes and bleaching and rinsing
baths. The degree to which heat recovery is practised
depends very much on the textile manufacturer and the
marginal conditions, with the result that the assessment of
energy efficiency will lead to wide-ranging results.Examples of precursor products and accompanying dyeing
processes: fibres are finished in loose stock bleaching and
dyeing equipment, the slubbing in the pack cylinders,
combed sliver in sliver cans, yarn in yarn dyeing machines,
warp threads on warp beam dyeing machines, rope yarn on
rope yarn dyeing machines, woven fabric on jiggers, beam
dyeing machines or continuous dyeing machines, warp
knitted fabric on air jet or water jet dyeing machines and
ready-made textiles are finished in specially constructed
facilities.Finishing of fabrics – dryers
Each of these dyeing processes has a different energy
efficiency. However, there is scarcely a single manufacturer
that operates all processes in parallel under one roof. The
application of each method is determined not by energy
relevance but by product requirements. As well as variations
resulting from the shape of the original product when dyeing,
all dyeing processes are divided into pre-treatment, dyeing,
rinsing and after-treatment.In many textile processes and not only in the dyeing
process, the drying process is part of the process sequence.
Dryers are sometimes integrated into linked systems, e.g.
in the bonding of nonwovens or, in the case of continuous,
open width washing machines, in the finishing of woven
fabrics. In other areas of finishing such as the finishing of
knitted fabrics, dryers are operated as stand-alone machines
(single units).
Amongst the key parameters that influence the energy
efficiency of textile dryers are :
NCM-APRIL 2020
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