WiN woodworking INTERNATIONAL 2022/1

USER REPORT
Efficient pump technology and a precise
surface result
With the Timmer pumps EGGER can pump
virtually all materials. A great advantage offered
by the double diaphragm pumps is the efficient
technology; the Timmer solution has an
extremely low start-up pressure. Conventional
market variants require a start-up pressure between
1.5 and 2 bar for the pump to even run at
all; the Timmer solution requires only 0.7 bar to
operate reliably even at 1 bar pressure. This results
in significant medium-term and long-term
energy savings, since compressed air requirements
are reduced by up to 50 %. Another advantage
is sustainable use of materials. For application
rollers the pumps work in a circulating
system: The medium is pumped between
the application roller and the dosing roller, excess
material runs back into the tank and is reused.
Thanks to the circulation system there is
no paint loss and EGGER saves valuable material
and it also saves costs.
Moreover, the proven control valve technology
developed by Timmer that is used
in the Timmer pumps, enables lower pulsation
and this is incredibly important for wood
coating processes: “With high pulsation, frequently
an irregular paint pattern occurs that
causes shadowing on the engineered wood”,
points out Rehker. Due to the fast changeover
time of the valve and the short-stroke principle
the pump generates a lower pulsation, so
that the medium flows uniformly through the
roller in a fine stream. This means that even
minimal quantities can be input into the process;
this is not the case with conventional
double diaphragm pumps. “For our customers
it is particularly important that the surface
of the wood always has the same appearance
– with a uniform paint application, the same
layer thickness and the same colour pattern.
Consequently, the high reproducibility that the
pumps make possible is critically important for
us”, states Rehker. Thanks to the Timmer solution
EGGER experiences far less microfoam in
the paint system; microfoam can cause small
air bubbles that impair the surface result. “The
advantage is that we don’t have to use an additive
and this protects the entire tubing and
the paint flow. Now we no longer need to add
anything and we can work without foam. Even
with low-viscosity fluids or varnish, there are
significantly fewer medium splashes, thanks to
the Timmer pumps”.
Maximum process reliability and easy
maintenance
Furthermore, the possibility of pump standstill
is excluded. This is ensured by a special,
low-wear, ceramic latching valve. All valve
plates in the heart of the Timmer pump are
made of ceramics in conjunction with precisionground,
high-performance plastics. This results
in minimum wear in the valve itself. In addition,
a short-stroke principle is used; the diaphragm
executes shorter strokes and therefore it is subject
to less wear. Also a flow monitor indicates
when varnish is no longer being pumped – this
is a customer-specific function that is a special
feature for EGGER. This prevents dry-run of the
application roller.
Timmer’s modern double diaphragm pumps ensure high-quality
coatings, optimal processes and efficiency at the highest level.
Another advantage: The double diaphragm
pumps from Timmer are extremely easy to
maintain and they are quite simply structured.
Because the valve is separated from the medium,
the diaphragms can be quickly replaced
when performing maintenance without having
to replace the air valve. Ball replacement and
cleaning are also quite simple. If specific pumps
must be inspected, they can be removed, i.e.
dismounted, very quickly and very easily. “The
pumps are so easy to maintain that they sustainably
increase the process efficiency in our
production and thus reduce costs long-term”,
says Rehker.
Timmer pump convinces EGGER
The surface coating of wood elements, for
which the high-performance double diaphragm
pumps are important components, quickly led
to the desired results: EGGER was able to optimise
the quality and the appearance of the coatings
and use the efficiencies to save valuable resources.
“The pumps were optimally tailored to
our process. The product quality and the minimal
service and maintenance effort required for
the Timmer pumps convinced us”, points out
Rehker and in addition he praises the short delivery
times, the service and reachability. With
this modernisation of the painting lines EGGER
and Timmer are laying the foundation for further
collaboration that will be continued and
expanded in the future. “EGGER is constantly
developing its capabilities as a company in the
wood coating industry. Naturally more systems
and pumps will be required”, says Rehker.
In wood processing, the coating is of particular importance, as it ensures durability and a flawless surface appearance.
www.timmer.de // www.egger.com
No. 1 • March 2022
19