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Drives for Web Handling

Blogmaster: Clarence Klassen

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Tension Measurement and Control

07

Drives tuned too slow

Posted by Clarence Klassen on May 7, 2012
Drives tuned too slow
At the IWEB conference at Oklahoma State University in 2011, one of the feature speakers, Dr. Günther Brandenburg, presented an interesting paper about tension control for printers. In the course of his research with a major printer manufacturer, he noted the requirement for faster tension regu...

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Posted in: Tension Measurement and Control, Tuning, Design
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30

Simple as Possible, Accurate as Necessary

Posted by Clarence Klassen on April 30, 2012
Simple as Possible, Accurate as Necessary
Dr. Günther Brandenburg, speaking at the IWEB conference at Oklahoma State University in 2011 spoke of making the controls as Simple as Possible, but as Accurate as Necessary. His keynote address was titled "Advanced Process Models and Control Strategies for Rotary Printing Presses". This soun...

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Posted in: Tension Measurement and Control, Tuning, Design, Measurement
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09

Torque Boost

Posted by Clarence Klassen on April 9, 2012
Torque Boost
  Often the Torque Hold function provides adequate tension during most of the index, but may not provide enough tension for a good clean cut. The knife may require a very taut web if the web is stretchy. In this case, Torque Boost is required. Torque Boost is used instead of Tension Boost, be...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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26

Torque Hold

Posted by Clarence Klassen on March 26, 2012
Torque Hold
Many events happen during a turret winder index that make it very difficult to control tension. An old, but practical, technique for surviving an index is to put the outgoing spindle into Torque Hold mode. Torque Hold is a drive function that memorizes the torque at a particular instant, and then...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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19

Tension Boost

Posted by Clarence Klassen on March 19, 2012
Tension Boost
One of the drive tools available for turret winder applications is tension boost. This function is different than torque boost. Tension boost is not always required. It may be required if the winder includes a layon roller or rider roller. The layon roller is removed for the turret index and thus t...

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Posted in: Tension Measurement and Control, Definitions, Design, Center Winding, Turret Winders
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05

Tension Variations Cause Web Displacement (MD and CD)

Posted by Clarence Klassen on March 5, 2012
Tension Variations Cause Web Displacement (MD and CD)
While not the only cause, it is well known that tension variations cause a web to move in the cross machine direction. The web displacement or movement can be in either direction, to the operator side or to the back side. With many webs the displacement can cause severe problems. Some of the proble...

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Posted in: Tension Measurement and Control, Design
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12

Running without tension

Posted by Clarence Klassen on December 12, 2011
Running without tension
This week I was called in to a paper mill to look at a problem following a drive upgrade. This was an old machine that had one section running in tension control for about 40 years. The old drive used a dc generator. The new drive was a previously enjoyed digital dc drive. After the upgrade, the ...

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Posted in: Tension Measurement and Control, Upgrades
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21

Tension Indicators

Posted by Clarence Klassen on November 21, 2011
Tension Indicators
20 years ago, tension was indicated with a 4” (100mm) analog meter on the operator console. These meters were rugged, accurate to about 1%, and provided a nice degree of damping or filtering. Today, the analog meter is rare, replaced with a number or bar on the operator console. The nu...

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Posted in: Tension Measurement and Control, Communications
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07

Dancers vs. Load Cells

Posted by Clarence Klassen on November 7, 2011
Dancers vs. Load Cells
The debate about which tension control scheme is better is not resolved to date. I can say I have had better success with load cells than dancers. The dancer is essential when the egg shaped (core off center) rolls are used, particularly on unwinds. I heard one vendor from Asia ask “Why woul...

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Posted in: Tension Measurement and Control, Tuning, Design
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31

Regulator Tuning - Guidance

Posted by Clarence Klassen on October 31, 2011
Regulator Tuning - Guidance
There is very little if any information on selecting the target Bandwidth (BW in radians/second) or response for the drive regulators used in web handling. We can safely assume the drive vendor’s instructions for tuning the torque loop are adequate. For the speed regulator, the guidelines are...

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Posted in: Tension Measurement and Control, Tuning, Design
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Blogmaster

Clarence Klassen photo

Clarence Klassen

President. Designated Consulting Engineer with Professional Engineers Ontario (PEO). KlassENgineering was incorporated in 1999. Clarence applies 31 years in the Pulp and Paper industry to solving problems with drives for web handling. He has 10 years experience as a drives engineer with GE Canada and 10 years experience with Opcode Systems Inc., a PLC and Drives Systems Integrator. Much of Clarence's experience was gained in onsite installation of new equipment and troubleshooting of existing equipment. KlassENgineering performs Pre-Start Health and Safety Reviews as required by the Ontario Ministry of Labour.