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Vishay installs Reel Optimizing System in European paper mill

  • July 09, 2008
  • Case Study

Summary

July 9, 2008 — Vishay Intertechnology delivered and installed a Reel Optimizing System in SCA's Ortmann Mill, located in Pernitz, Austria. SCA is a global consumer goods and paper company. Its Ortmann Mill produces toilet paper, facial tissue, and napkins for European markets. Vishay's customized Reel Optimizing System, delivered in April to the Ortmann Mill, uses strain gage-based load cells to improve roll density by controlling the nip force throughout the entire reel spool change-over process. The system replaces the existing pneumatic cylinder pressure control system with a hydraulic cylinder force and position control system.Vishay's Reel Optimizing System is designed to provide online measurement and control, on each side of the machine, of all force and movement. This method eliminates all problems caused by friction, non-parallelism, and general wear and tear. The effect of different spool weights on nip force is eliminated by automatic weighing of each spool, which is carried out when changing reel spools in the primary arms. Each system controls nip force during the shifting phase and corrects for angle changes when lowering reel spools. Parallelism, acceleration, and speed are all controlled during the lowering process, which greatly reduces machine vibration. This process minimizes variations in reel drum speed and web tension. When shifting, the forces between the primary and secondary arms are added to ensure that the required nip force is maintained.Reel Optimizing System measurement data is presented online as current data. The system's optimizing logger stores the data for later analysis in servicing as well as quality and product research. Multiple nip force set values for different qualities can be pre-programmed and even adjusted within selected areas by an operator. Vishay's Reel Optimizing System was installed on Ortmann Mill’s paper machine number 4, which produces consumer tissue. The machine was installed in 1992 and has an annual capacity of 88,000mt/y. It has a trim width of 7.0m and a maximum speed of 1,830m/min. About SCASCA (Svenska Cellulosa Aktiebolaget) is a global consumer goods and paper company that develops, produces, and markets personal care products, tissue, packaging solutions, publication papers, and solid-wood products in more than 90 countries. SCA creates value through knowledge of consumer and customer needs, regional presence, and efficient production. About Vishay SystemsVishay Systems manufactures, installs, and services systems for weighing and force measurement and control. These include systems with transducers and instruments to control process weighing in food, chemical, and pharmaceutical plants; force measurement systems to control web tension in paper mills, roller force in steel mills, and cable tension in winch controls; on-board weighing systems that are installed in logging and waste-handling trucks; and special scale systems for aircraft weighing and portable truck weighing. Vishay Systems is a division of Vishay Measurements Group, which develops, manufactures, and markets components, instruments, and systems for a wide variety of test and measurement applications. These include electrical resistance strain gages for both stress analysis testing and transducer manufacturing applications, as well as strain gage instrumentation; PhotoStress coatings and instruments, which use a unique optical process to detect stress and other physical forces; and transducer products such as load cells, force transducers, and instruments. Vishay Measurements Group is part of Vishay Intertechnology.Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, and optoelectronics and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and ability to provide "one-stop shop" service have made Vishay a global industry leader. Learn More

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