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Drives for Web Handling

Blogmaster: Clarence Klassen

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Diameter

24

Wrong Calculated Diameter

Posted by Clarence Klassen on October 24, 2011
Wrong Calculated Diameter
I recently had a call about a winder shutting down due to oversized rolls. This only happened when orders for large rolls were run. The rolls were not actually oversized. The diameter calculator was calculating incorrectly. Before discussing the cause and cure for the incorrect diameter, I want to...

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Posted in: Diameter, Maintenance
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09

Web Length Changes

Posted by Clarence Klassen on May 9, 2011
Web Length Changes
Web tension is complicated whenever the web path changes. This may happen when nips open or close. It has a huge impact during and index or cutover in a turret winder. Whenever the web length changes, the speed of at least one roll or roller must change to maintain tension. If the web length shorte...

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Posted in: Diameter, Tension Measurement and Control, Inertia Compensation, Design, Center Winding
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25

Winder Diameter Measurement - Method 5

Posted by Clarence Klassen on October 25, 2010
Winder Diameter Measurement - Method 5
Method 5 for determining the diameter of a winding roll is to use a sensor on a rider roller or layon roller to measure the distance to the outer layer of the winding roll. This method can be quite satisfactory if its disadvantages are accounted for. The sensor may be a Linear Variable Differential...

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Posted in: Diameter
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18

Inertia Compensation for a Winding Roll

Posted by Clarence Klassen on October 18, 2010
Inertia Compensation for a Winding Roll
While Inertia Compensation should be considered for a fixed roller, it is almost always required for winding rolls if the line speed changes. That is because there is a huge change in inertia between core diameter and maximum diameter of a roll. Inertia of the roller increases with the 4th power of ...

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Posted in: Diameter, Tuning, Inertia Compensation, Center Winding
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11

Winder Diameter Measurement - Method 4

Posted by Clarence Klassen on October 11, 2010
Winder Diameter Measurement - Method 4
Method 4 for determining the diameter of a winding roll is to use a laser or ultrasonic sensor to measure the distance to the outer layer of the winding roll. This method can be quite satisfactory if its disadvantages are accounted for. The sensor (laser or ultrasound) is pointed toward the center ...

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Posted in: Diameter, Center Winding
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27

Winder Diameter Calculation - Method 3

Posted by Clarence Klassen on September 27, 2010
Method 3 for calculating the diameter of a winding roll is re-invented and found occasionally. This method uses a mathematical model of the winding roll. If the gauge of the product is known and constant (it never is), then each revolution of the winding roll adds twice the gauge to the roll diamete...

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Posted in: Diameter, Center Winding
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22

Winder Diameter Calculation - Method 2

Posted by Clarence Klassen on September 22, 2010
In the April 8th blog, I discussed Method 1 for calculating the diameter of a winding roll based on the ratio of two speed feedbacks. Method 2 diameter calculation uses the same two encoders or tachometers, but the diameter is based on the ratio of position feedback. This method has advantages over ...

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Posted in: Diameter, Center Winding
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08

Winder Diameter Calculation - Method 1

Posted by Clarence Klassen on April 8, 2010
Since motors regulate RPM and web handling is concerned with producing web at a controlled speed measured in FPM or MPM, we must know the winding diameter accurately. There are many methods to derive the diameter. The trivial case is for a roller of fixed diameter. In this case the manufacturer&rsqu...

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Posted in: Diameter, Turret Winders
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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.