Maximum dewatering plus energy savings - Paper Technology International 2023 - Paper Technology International 2023 - Flipbook - Page 26

Maximum dewatering plus energy savings - Paper Technology International 2023

PAPERTECHNOLOGYINTERNATIONAL - Paper Technology International 2023
Maximum dewatering plus energy savings
Franz Kiefer, Strategic Product Manager Pressing, Heimbach
INTRODUCTION:
Faced with a backdrop of spiralling energy costs paper manufacturers are more than ever confronted with the difficult task of
keeping the cost of production as low as possible. The motto is – less energy, more productivity. The implication of this is that paper
machines have to be pushed to their performance limits: High machine availability, optimum runnability and maximum possible speed are
the focus. A top priority in achieving these goals would normally be to obtain maximum dry content coming out of the press section. This, of
course, places high expectations on the performance of press felts. Atromaxx and Atromaxx.Connect from the NewTech product portfolio
are well placed to satisfy these expectations.
The concept is based around multi-axial carrier modules
providing a structure that is essentially incompressible. On the
one hand, this allows a designated void volume to be maintained
throughout the lifetime of the felt, whilst on the other hand the open
drainage channels are able to handle large volumes of water. The
result: exceptionally high dry content!
Thanks to its modular design, Atromaxx is highly versatile
in terms of paper grade application as well as speed range and,
combined with a suitable non-woven layer , should be suitable for
every machine and nip configuration.
Safe and fast
The outstanding properties of conventional Atromaxx are
certainly replicated in the seamed version of the felt. Atromaxx.
Connect can be installed quickly and safely while requiring few
personnel and brings the additional benefit of drainage values
that conventional seamed felts cannot match. High speeds are no
problem either, as the seam area and seam itself are designed with
this in mind.
Turn off Uhle boxes
Nip dewatering can come into play when machine speeds
exceed 600 m/min, making it possible to reduce – or even
completely switch off – vacuum in felt suction boxes. When this
occurs, the door is opened to huge energy savings. A prerequisite
for this would be an individually designed and precisely matched
press felt design such as Atromaxx, whereby higher dry content,
better runnability and faster start-up can be realised. Numerous
references provide compelling confirmation of this.
The Atromaxx family - Product Features
Unmatched flexibility
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The dewatering behaviour of a press felt is significantly
influenced by machine speed, pressure pulse and felt saturation
level. So, at speeds below 600 m/min nip dewatering is more or less
impossible. Even under these conditions, however, Atromaxx can
achieve considerable dry content values. This flexible design can
come into its own on machines where, depending on paper grade,
speed fluctuations necessitate switching between nip and suction
box dewatering.
Multiaxial felt
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Modular construction: Combination of totally
different base properties possible within one
felt
Outstanding compaction resistance due to
multiaxial structure
Outstanding void volume retention
Absorption of huge amounts of water
Excellent dewatering throughout felt lifetime
High stability
Operation modes for nip and uhle-box
dewatering
Applicable for all paper grades

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