Infobox0810 Agnati upgrades - Vonderheiden

Infobox 08/ 2010
Successful upgrades of single facer Agnati S 90 and Master
Hydraulic Soft Touch System Package
Glue dam package and web edge detection
Exchange of existing pneumatic- against hydraulic-system
After many successful upgrades of several
types of single facers from Peters, Langston,
Simon and MHI, the company
Vonderheiden add two new single facers,
Agnati S 90 and Master to their product
portfolio. By this upgrade the users will
achieve better quality and higher
availability, combined with less glue
consumption and reduced waste.
The conventional paper gap system on an
Agnati single facer requires frequent gap
adjustment and frequent calibration by the
operator.
Occurring inaccuracies are mostly
compensated by increased glue
application and higher glue consumption is
the result.
The company Vonderheiden upgraded an
Agnati S90 and Master single facer
successfully in two customer sites from
pneumatic glue gap setting to proven
hydraulic Softtouch-system.
The existing glue gap adjustment will be
replaced by the VDH hydraulic Softtouchsystem.
This system works with a low
hydraulic pressure, which allows running
without glue gap adjustment during
production and final calibration afterwards.
The applicator roll touches slightly the
paper on the tips of the corrugating roll
and makes any adjustment for different
paper thickness or flute profiles at any
speed redundancies.
Advantages
• Production of all paper thicknesses
without paper gap adjustment
• No calibration required
• Thermal expansion of the corrugating
rolls at different speed will be
compensated
• No inaccuracies of read-outs
• Maintenance free components
• Waste reduction (especially after
profile change)
• Reduction of glue consumption
Standard System Soft Touch System
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Direct drive for single facer glue
unit
In order to use the sofftouch system
successfully , the speed of the applicator
roll must be adjustable in relation to the
corrugating roll speed.
Up to now the S90 glue unit is mechanical
driven by a clutch and cardan shaft.
These components are sensitive to failure,
but even more critical is non-adjustabilitiy
of the speed ratio of the relative speed
applicator to corrugating roll.
Therefore the existing system had to be
replaced by a servo drive, which was due
to the restrictive available space a difficult
task. This problem was due to precise
engineering solved and finally installed.
One of the customer has two S90´s in
his corrugator and has a very good
comparison from old to new system.
Right after the start-up a direct
comparison was run (same order,
same paper, same glue) and they are
very pleased with the results (ECT,
operator friendliness).
The result about savings in glue
consumption couldn´t be submitted at
this stage, but we will inform you
immediately after the availability of
these data.
Due to the positive experiences the
second machine of this customer will
be upgraded soon.
New glue dams
The existing glue dams didn’t seal very
well, plus the holders and fixation are
relatively instable. The existing rubber
glue dam sealing leads to an inexact
glue edge, which can transfer the glue
to corrugating- and press-/calander
roll, causing production and quality
problems.
As done on other single facers too, the
existing glue dam system was
replaced by state-of-the-art bronze
glue dams, improved sealing together
with stronger levers.
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The glue dam package can be seen as first step into improving the machine.
The new glue dam modification can be done separately without any other upgrade
and immediately a much smaller and more accurate glue edge will be the result.
By doing only this single modification the user should not loose his vision of the
required result and that his key problem must be solved sustainable.
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Existing, undefined New , accurate glue line
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Improved glue dam positioning
What are the advantages of improved
glue dams if the positioning isn’t
reliable and accurate?
Within the existing pneumatic system
there’s always remaining air in the
tubes, which leads to an inexact and
uncontrolled positioning of the glue
dams.
In order to get rid of this problem VDH
replaced the pneumatic by new
electronic motors and achieve a very
precise positioning.
Web edge detection
After doing all these improvements to
the machine it only remained the
weak point of a proper functioning
web edge detection.
Due to the tough environment (steam,
dust, moisture etc.) all known available
systems can’t guarantee any
precision, which again leads to wrong
positioning.
In order to overcome this problem the
customers decided to install the
newest BHS technology.
The BHS light grid has one sender and
receiver, which are protected behind
special glass, which prevents dust
contamination. The accuracy of this
system is with ± 1 mm much better
than conventional systems.
There are no moving parts or no
sensors, which must follow the web
edge.
Additional advantages are the
reduction of required maintenance
and reduced calibration.
Due to the immediate detection of the
actual web edge the glue dams will
follow immediately into the new
position.
Receiver
Sender
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As reported both users are very satisfied with the results of the modifications done.
Shortly there will further single facers upgraded.
Naturally all described upgrades can be done separately, but it must be understood
that the final planned achievement must be reached and that the upgrades must
solve the problem sustainable !!!
Summary of the described upgrades:
.
1. Hydraulic Softtouch package
2. Glue dam package
a. Direct drive for glue unit
b. New glue dams by improved design and bronze material
c. Improved glue dam positioning by new motor
3. Web edge detection by BHS light grid
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Vonderheiden Maschinenbau und Messtechnik GmbH
Tel.: +49 (0)40-589 55-0
Fax: +49 (0)40-589 55-21
info@vonderheiden.com
http://www.vonderheiden.com
24h-Hotline Electrical & Mechanical
+49 (0)160- 714 09 00
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