The Comparison, Measuring & Labelling of Energy-efficient Textile Machinery
Process chains and their
impact on energy efficiencyInfluenced
by :
B = Textile
Manufacturer
R/M = Raw
Material/
Material
P = Product
H=
Machine
ManufacturerOnly in a few cases, such as in spinning preparation or
finishing, are textile machines comparable with a stand-
alone device such as a domestic washing machine. Often
they are part of a system or a process chain in which there
can be interactions in terms of energy use amongst the
sub-processes. Thus the energy consumption of a machine
which is being studied is also greatly influenced in many
cases by the upstream process, e.g. by the quality of input
goods.
Examples
Spinning preparation – spinning :
A heavily contaminated raw material or inadequate cleaning
during preparation for spinning lead to a large number of
yarn breaks and cleaning cuts in the spinning machine.
This results in reduced efficiency and high specific energy
consumption in terms of kWh/kg yarn.G=
Legislation
Twisting machines :
Ring-spinning compact yarn allows less rotation – each
rotation costs more energy. Also in the next step of twisting,
fewer twisting rotations are then necessary with the result
that the effect achieved through the spinning process, pays
off once again in the subsequent step.
Stentering machines with upstream application devices:
Using a standard solution with a padding mangle, the total
energy consumption of the system is much higher
Interim conclusion
The examples illustrate that the main factors influencing
energy efficiency are many, and very varied, and that the
combination of processes and process parameters is almost
infinite. The textile manufacturer, the demands on the textile
product, the material, the fibre supplier and the machine
manufacturer all have an influence on setting the
parameters.
The examples also show that the influence of the machine
manufacturer on the energy efficiency of the process is
very limited.
If you wish to assess energy efficiency, this would only be
possible in a very limited way for an entire individual process
for manufacturing a textile product. The VDMA Textile
Machinery Association will check with its member
companies the machine groups or isolated process steps
for which it makes sense for a framework and a defined
operating point to be established for a textile product in
order to provide comparable energy efficiency information.
NCM-APRIL 2020
61