RESEARCH & DEVELOPMENT
AquaPress excels thanks to its special surface structure
New polyurethane cover for press rolls
In summer 2010, Voith Paper is launching the efficient AquaPress polyurethane cover for press
rolls into the market. Thanks to its innovative WebNet technology and a sophisticated groove
concept, it provides optimal dewatering and better paper quality.
Roll covers for press rolls, by their
is more elastic than standard
minimum width of 2.0 mm between
very nature, have to offer more
polyurethane roll covers.
grooves, AquaPress covers can
efficient dewatering than covers
meet the dewatering requirements
for suction rolls. Since there is no
Deep grooves, higher drainage
of most press applications. Deeper
vacuum applied to press rolls, the
capacity
grooves provide additional cover
combination of the roll cover and felt
are the key factors in dewatering.
storage capacity and allow for
These improved material
increased water removal in
characteristics allow for innovative
demanding positions. In addition,
The new >>> AquaPress roll cover
surface patterns. The depth and
the excellent hydrolytic behavior of
meets this core requirement with its
width of the dewatering channels
the AquaPress polyurethane means
special surface structure. The
can be enlarged without impairing
the cover absorbs far less water.
AquaPress technology is primarily
the stability of the product. With
The material does not swell, which
a result of two Voith Paper develop-
a maximum groove depth between
results in reduced wear and longer
ments: an innovative polyurethane
2.0 and 2.5 mm and an allowable
running times of up to 12 months.
functional layer and the new WebNet
bonding technology. The functional
layer has a dense molecular structure
with improved material characteristics.
It has enhanced mechanical strength,
outstanding hydrolytic behavior and
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>>> Info: AquaPress
Starting in summer 2010, AquaPress will be available in the market and will complete the series
of high-performance roll covers from Voith Paper. The rest of the series consists of the SolarPress
and G2000 covers for press rolls, SolarFlow and AquaFlow for suction rolls and the SolarMax roll
cover-felt combination.
30 I 2010 I Voith Paper I twogether
RESEARCH & DEVELOPMENT
Continuous
operational
temperature on
the cover surface
Hardness
Primary applications
AquaFlow
75 °C
5, 10, 15, 20,
25, 30 and 35
P&J
SolarFlow
80 °C
AquaPress
Groove dimensions
Groove width
Web width
Groove depth
Suction roll
0.5-0.9 mm
2.0-2.5 mm
2.0-2.3 mm
Roll cover for all
current applications
5, 10, 15, 20,
25, 30 and 35
P&J
Suction roll
0.4-0.9 mm
1.8-2.5 mm
2.5-3.0 mm
Premium roll cover
for high demanded
applications
75 °C
5, 10, 15, 20,
25, 30 and 35
P&J
Press rolls, smoothing press
rolls, counter rolls in double
felted shoe presses
0.5-0.9 mm
2.0-2.5 mm
2.0-2.5 mm
Roll cover for all
current applications
SolarPress
80 °C
5, 10, 15, 20,
25, 30 and 35
P&J
Press rolls, smoothing press
rolls, counter rolls in double
felted shoe presses
0.4-0.9 mm
1.8-2.5 mm
2.5-3.0 mm
Premium roll cover
for high demanded
applications
G 2000
85 °C
4 P&J
Press rolls and counter rolls in
double felted shoe presses
Steel roll replacement
0.4-0.9 mm
1.8-2.5 mm
2.5-3.0 mm
Premium roll cover
for high demanded
applications
The right cover for each application: Voith Paper offers different polyurethane roll covers for the press section.
AquaPress is available in three
blind-drilled holes with the newly
WebNet is based on the
different surface designs:
developed groove structures.
interpenetrated network technology
grooved, blind-drilled or a
used in aircraft and automobile
combination of grooved and blind-
WebNet technology as the
construction. The close cross-linking
drilled. AquaPress can therefore be
successor to AST
of polymers in the bonding layer
adapted to meet the dewatering
results in improved temperature
demands of the customer’s
The WebNet layer is an additional
resistance and increased stability
application. It is also worth noting
innovative component of AquaPress.
of the roll cover against chemical
that in some applications a high
WebNet has an enhanced three-
damage and high mechanical stress.
void volume grooved surface pattern
dimensional cross-linking of polymers
may be used instead of grooved
and provides an improved bond
and blind-drilled. These patterns can
between the polyurethane functional
provide improved dewatering and
layer and the base layer. WebNet
eliminate the potential for nip flooding
is an evolutionary advancement of
and shadow marking. AquaPress
the AST bonding layer developed
compensates for the capacity of the
by Voith Paper in the 1990s.
Contact
Michael Weinzettl
michael.weinzettl@voith.com
The grooved AquaPress roll
cover (left) stands out due to
the new WebNet technology
(right).
30 I 2010 I Voith Paper I twogether
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