E-mobility Technology Summer 2020

THINK HOLISTIC
BATTERY
MATERIALS
SYNTHETIC
RUBBER
bonded core sheet has very limited tolerances:
an under-cured varnish can be squeezed out
of the stacking, while an over-cured varnish
might no longer bond the laminations. An
optimised, uniform curing level and process
control is therefore paramount. And that
is exactly what TAU’s LILIT now delivers - a
real-time, in-line, non-destructive curing
control that offers peace-of-mind at both
the steel mill and the punching line.
LILIT uses spectroscopy boosted with
industry 4.0 artificial intelligence data analysis
to identify relevant inconsistencies and
defects in the coating. This allows the steel
mill operator and the puncher to set or to
adjust their production parameters correctly,
according to the target product specifications.
It minimises the possibility of poorly cured
self-bonding composites and provides
accurate insight - at a rate of more than 95
percent - into the electrical steel coil coating.
Consequently, LILIT removes the need for timeconsuming
and destructive laboratory tests.
Shedding light on the curing of selfbonding
paint – making it work
Every steel mill and every puncher have
their own individual process requirements
for core sheet manufacturing, stacking and
laminations, so tailoring the system to their
individual needs is key. This consists of three
steps: installation, calibration and learning.
For the installation, TAU engineers go on-site to
work closely with the plant’s process operators.
After evaluating the premises and addressing the
real operational and environmental conditions
- such as temperature, humidity and luminosity -
they indicate the right positioning for LILIT, which
is no bigger than a large shoebox, and suggest
the best installation set-up. Depending on the
number of control channels the user wants to
run simultaneously, the installation is finalised
by TAU within a few days. Electrical and network
connections are provided by the plant operators.
LILIT relies on contactless spectrometric
analysis to detect fluctuations in the curing
level of self-bonding varnishes. The position
of the probe must be as precise as possible.
TAU works on-site until this precise calibration
is complete and the probe is firmly attached
with the supporting holder. Nominal production
parameters like core sheet speed, oven
temperature and ventilation for the selected
Axalta Voltatex varnish are set up by the user.
The TAU engineer selects this signal as a
reference spectrum. The acquired spectrum of
one line can later be used for further channels
in case of multi-channel installations.
LILIT is then taught how to define whether
the Voltatex polymeric surface is under-cured,
FIBERS &
TEXTILES
ELECTRONICS
PERFORMANCE
PLASTICS
FOAM
MATERIALS
e-mobility Technology International 48
WE MAKE FUTURE MOBILITY WORK .
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