Browsing Proceedings of the International Conference on Web Handling by Title

Now showing items 385-404 of 429

    • Web bagginess: Making, measurement and mitigation thereof 

      Roisum, D. R. (Oklahoma State University, 2001-06)
      Web bagginess is a defect so tenacious that few machines will totally escape its grip. It is so pervasive that it can be found on materials as diverse as tissue, writing paper, carpet, nonwovens, plastic film and steel. ...

    • Web flutter at circular-tube air-turn bars 

      Moretti, P. M.; Chang, Y. B. (Oklahoma State University, 1997-06)
      Circular tubes having air-emitting holes are often used for non-contact handling of photographic and magnetic media and for printed paper webs. One of the problems of circular-tube air-turn bars is their tendency to cause ...

    • Web handling for flexible display manufacture 

      Walton, R. L. (Oklahoma State University, 2005-06)
      Flexible displays manufactured in a continuous roll-to-roll fashion are the "Holy Grail" of the display industry. This paper offers an assessment of the development efforts related to web handling, which are required to ...

    • Web handling technologies, past, present and future 

      Swanson, R. P. (Oklahoma State University, 2001-06)
      This paper gives a brief description of the evolution of technical knowledge. The evolution of beam theory is given as an example from the field of strength of materials. Technical knowledge starts with information gained ...

    • Web instability at open draw and its impact on paper machine efficiency 

      Parent, Frederic (Oklahoma State University, 2015-06)
      Paper machine efficiency is mostly affected by machine down time, resulting from maintenance work and web breaks. One of the main factors affecting breaks is the web instability at open draws on paper machines, especially ...

    • Web lateral dynamics with buckling in sheet metal rolling 

      Tarnopolskaya, T.; Yuen, W. Y. D.; Gates, D.; deHoog, F. R. (Oklahoma State University, 2005-06)
      The stability of web lateral motion is of importance in many engineering applications where the deviation of the web from the processing direction is highly undesirable and can cause various defects. This is especially ...

    • Web length creep in wound rolls 

      Mollamahmutoglu, C.; Gajjalla, A.; Markum, Ron E.; Azoug, Aurelie; Good, J. K. (Oklahoma State University, 2019-06)
      For convenience, webs are stored in wound rolls. The available web length in a wound roll is one mark of roll quality and a concern for many who process and convert webs. Elastic winding models have proven very precise at ...

    • Web line resonant frequencies 

      Pagilla, P. R.; Diao, Y. (Oklahoma State University, 2009-06)
      The goal of this paper is to investigate the resonant frequencies of a system of idle rollers and web spans. Of particular interest is the determination of the minimum resonant frequency as a function of the number of idle ...

    • Web longitudinal dynamics 

      Walton, B.; Rice, B. S. (Oklahoma State University, 1997-06)
      Tension transients in a moving web can be described and predicted adequately from first principles. The resulting mathematical models are very useful for designing and debugging web conveyance machines and their controls. ...

    • Web sag and the effect of camber on steering 

      Jones, Dilwyn P. (Oklahoma State University, 2007-06)
      A web in a horizontal span will deflect downwards due to gravity. This sag is more pronounced for heavy materials in long spans under low tension. It is possible for a web whose unstretched length is greater than the span ...

    • Web tension and wrinkles in the printing press 

      Linna, Hannu; Moilanen, Pertti; Parola, Markku (Oklahoma State University, 1993-06)
      In a modem paper mill the web handling in every process stage is optimized to fulfill productivity demands. The same kind of demands also exist in the printing plants. Smooth production without runnability disturbances is ...

    • Web tension behavior in the presence of eccentric rollers: Modeling and validation 

      Branca, C.; Pagilla, P. R.; Reid, K. N. (Oklahoma State University, 2011-06)
      Since rotating machinery is used to transport the web on rollers, it is common to observe periodic oscillations in measured signals such as web tension and web transport speed. These periodic oscillations are more prevalent ...

    • Web tension control in an industrial accumulator 

      Koc, H.; Knittel, D.; de Mathelin, M.; Abba, G.; Gauthier, C. (Oklahoma State University, 1999-06)
      This paper presents the study of an industrial accumulator used in a web transport system. In order to understand the main characteristics of the accumulator and the causes of problems appearing during transient phases, ...

    • Web tension in a flotation dryer 

      Ries, J. P. (Oklahoma State University, 1997-06)
      In a flotation dryer, the web rides on a cushion of air and typically takes a "sine wave" path over the air bars. The non-straight path and the elastic effect of the air cushion interact with the normal tensioning of the ...

    • Web tension in an accumulator and industry needs for the future 

      Michal, Neal (Oklahoma State University, 2009-06)
      A web is defined as a continuous strip of flexible material. Continuous web processes provide cost savings to manufacturers and converters. Converting processes use unwinds to provide a continuous supply of web material. ...

    • Web tension measurements in the paper mill 

      Linna, H.; Moilanen, P.; Koskimies, J. (Oklahoma State University, 1991-05)
      Web tension measuring methods and corresponding instruments have been evaluated at the Graphic Arts Laboratory of the VTT. Together with Valmet Paper Machinery, cross-web tension profiles have been studied in different ...

    • Web tension profiles as measured in a rewinder and in a printing press 

      Hellentin, P.; Eriksson, L. G.; Johnson, P.; Kilmister, G. T. F. (Oklahoma State University, 1993-06)
      The web tension profile has been measured with an equipment called the CTSensor (Cross Tension Sensor) during ordinary production-runs both in rewinders and in newspaper printing presses. The measuring roller was placed ...

    • Web tension regulators - control heuristics 

      Klassen, Clarence (Oklahoma State University, 2013-06)
      Classical Control Theory using closed-loop controllers has been applied to drives for web handling beginning in the 1940's. Back then the mathematics was ahead of the tools for analysis as well as the modeling and the drive ...

    • Web tension variations caused by temperature changes and slip on rollers 

      Jones, D. P.; McCann, M. J.; Abbott, S . J. (Oklahoma State University, 2011-06)
      Webs are frequently heated or cooled on rollers, where thermal expansion or contraction attempts to reduce or increase tension respectively. In the case of vacuum coating, the web first cools on the chilled drum, then is ...

    • Web wrinkling resulting from moment transfer 

      Fu, Boshen; Good, J. K. (Oklahoma State University, 2013-06)
      Considerable research has been focused on the impact of roller misalignment on web instability. Early work focused on the prediction of trough instabilities in the entering span, just upstream of the misaligned roller [1]. ...