PillowBlock Tensiometer Systems Web Tensiometer in the Paper and Board Industry
The measurement problem solved with PillowBlock Tensiometer Systems The importance of a good load cell For the quality of the paper or board to be constant, web tension must be controlled. Effective tension measurement is therefore important for the result, both in terms of quality and quantity. This applies to paper and board as well as wire and felt. The PillowBlock Tensiometer System from ABB is the perfect answer for all these applications. The PillowBlock Tensiometer System has modern signal processing electronics. This makes for easier measurement, partly because it offers several signal outputs. The PillowBlock Tensiometer System permit direct measurement and control of the tension and is easy to install in the process. With continuous direct measurement by PillowBlock Tensiometer Systems in a process, the web tension can be kept constant, even during transitions from one operating mode to another. In many situations PillowBlock Tensiometer Load Cells, with their extremely rugged design, is the only usable option. Simple but brilliant electronics Optimum measurement and control of tension in wire, felt and web call for more than sensitive, rugged transducers. The electronics that process the signal from all load cells are also of crucial importance. With PillowBlock Tensiometer Systems, everything except certain optional functions is grouped on a single circuit board. This board carries circuits that amplify, rectify, filter and process the output signals for two or up to six load cells. All the outputs needed for indication and control are provided. The signal processing part has identical channels, one for each load cell. The measurement signals can be taken off separately or as a sum or difference signal. Each of these signals has a fast control output, and a filtered output to which indicating instruments may be connected. The PillowBlock Tensiometer Load Cell has a solid stainless steel construction that combines sensitivity and accuracy with exceptional ruggedness and stiffness.
PillowBlock Tensiometer Systems an investment that soon pays for itself Help to avoid downtime With the direct measurement principle, PillowBlock Tensiometer Systems contribute to higher yield, higher quality and greater reliability. An increase of one hour per year in the available operating time is equivalent to some USD 50 000 at the time of investment. Direct measurement of web tension avoids much of the downtime due to web tearing. A sense of security When comparing web tensiometers, you ll need to consider the sense of security they bring. You re looking for more than a good product; your supplier must have experience and resources. With more than 25 000 installed PillowBlock Tensiometer Load Cells world wide, ABB has an outstanding track record. ABB holds certificates of compliance with the ISO 9000 quality standard, so all PillowBlock Tensiometer Load Cells undergo comprehensive testing and calibration before they leave the factory. PillowBlock Tensiometer Load Cells bring you that sense of security. The performance of a PillowBlock Tensiometer Load Cell is outstanding in applications characterized by heavy rolls, high speed and severe conditions.
PillowBlock Tensiometer Systems proven accuracy wherever and... however the load cell is located in the paper machine PillowBlock Tensiometer Systems are the ideal measuring equipment for papermaking machines robust, easy to place and accurate. The measurement signal provided by PillowBlock Tensiometer Load Cells can be used to indicate the web tension and, via a control system, to keep web tension constant. PillowBlock Tensiometer Systems are a measuring system that soon pays for itself in reduced wastage, higher availability and better quality. A PillowBlock Tensiometer Load Cell has five properties that are especially important for web tension measurement: 1. Measurement and control of wire and felt tension are crucial for the operation and endurance of these components. High mechanical rigidity Two directions of measurement Equal sensitivity in both directions of measurement A linear measuring range twice as wide as the nominal range Insensitivity to electrical interference These properties neutralise the effect of imbalance and vibration, and are the foundation of effective, reliable web tension measurement.
2. For accurate control of the drive control, web tension measurement should start already at the drying section. 3. The PillowBlock Tensiometer Load Cell, here mounted at the end of the drying section, before entry to the calender. 4. The PillowBlock Tensiometer Load Cell is also used to control web tension during winding.
High mechanical rigidity Two directions of measurement Equal sensitivity in both directions of measurement A linear measuring range twice as wide as the nominal range Insensitivity to electrical interference 5. Web tension measurement is a way of detecting and avoiding diagonal shear stresses in the web. This is especially important in the coating section. 6. A PillowBlock Tensiometer Load Cell at the entry to the calender. The same arrangement may be used before and after winder and rewinder.
The measurement principle that became a world success PillowBlock Tensiometer Load Cells are based on the same well-known measurement principle as many of ABB s other successful force measurement systems, the Pressductor Technology. This type of load cell is in many ways unique, mainly as a result of its combination of accuracy, overload capacity and ability to withstand severe environments. In PillowBlock Tensiometer Load Cells this principle has been developed and adapted to correspond to the special requirements of web tension measurement. This is why the transducer in a PillowBlock Tensiometer Load Cell is sensitive only in the direction of measurement. No moving parts There are no moving parts in a PillowBlock Tensiometer Load Cell at maximum deflection it is compressed by only a few hundredth of a millimetre! The rigidity of the load cell overcomes the risk of critical speeds adversely affecting the measurement results. The load cell is also totally insensitive to electrical interference from the mains. Easy to install many alternative mounting arrangements Normally the load cells are installed immediately below the two bearing housings of the roll. Often they can be fitted directly to an existing machine. Major modifications are seldom required. Load cells do not have to be mounted horizontally. You can choose the position and orientation of the load cells, disregarding any tilt. Even where the load cell is affected by the weight of the deflector roll it is perfectly possible to obtain a reliable measurement result. Due to the Pressductor Technology the characteristics of the load cell do not change during operation, which means that no regular recalibration is necessary. 7. A modern paper machine, showing suggested locations and alternative installation arrangements for the PillowBlock Tensiometer Load Cell.
ABB is a world-wide organization committed to providing solutions for the generation, transmission, distribution and use of electrical power. It consists of 1000 companies in 140 countries. As part of that group ABB Automation Products is one of the world s largest suppliers of industrial automation, products and services. Unique global resources provide the highest levels of customer value growing from in-depth knowledge and understanding of industry needs. Leading edge technology, specific application knowledge and an uncompromising commitment to quality make ABB Automation Products an important partner for industries in their drive for productivity, quality and profitability. ABB Force Measurement is a division within ABB Automation Products. It provides equipment for accurate, reliable measurement and control in a broad range of applications from steel making to paper converting industries. Printed at: Västra Aros Tryckeri, Västerås 1998-11 Pressductor is a registered trademark of ABB Automation Products AB 3BSE000491R0301 ABB Automation Products AB S-721 59 Västerås Sweden Phone: +46 21 34 20 00 Fax: +46 21 34 00 05 Internet: www.abb.com/pressductor We have local representatives in: Argentina Buenos Aires, Australia Melbourne, Austria Vienna, Belgium Brussels, Brazil São Paulo, Canada Montreal, Chile Santiago, China Beijing, Denmark Odense, Finland Helsinki, France Décines, Germany Düsseldorf, India Bangalore, Indonesia Jakarta, Italy Milan, Japan Tokyo, Korea Seoul, Malaysia Kuala Lumpur, Mexico Guadalajara, South Africa Johannesburg, Spain Bilbao, Taiwan Kaohsiung, Thailand Bangkok, United Kingdom Manchester, USA Brewster N.Y., Venezuela Caracas