Browsing Proceedings of the International Conference on Web Handling by Title

Now showing items 61-80 of 429

    • Concerning wound mill roll quality and take-up tension control 

      Kataoka, Y. (Oklahoma State University, 1991-05)
      Biaxially oriented web manufactured by the tenter method is first wound into a mill roll as the middle stage of the product roll manufacturing process. It is well known that mill roll winding quality greatly affects final ...

    • Connection between longitudinal and lateral web dynamics 

      Brown, Jerald L. (Oklahoma State University, 2019-06)
      Where does the entry angle come from? This paper will show that the answer to this question reveals a connection between longitudinal and lateral behavior that has gone largely unnoticed.

    • Considerations in the selection of a dancer or load cell based tension regulation strategy 

      Carlson, D. H. (Oklahoma State University, 2001-06)
      Two methods are predominantly used to control tension in web lines: a position regulated dancer roller strategy or a regulator based on tension feedback from a load cell. Dancers are most typically used on the unwind or ...

    • Contact mechanical approach to the winding nip 

      Jorkama, M.; von Hertzen, R. (Oklahoma State University, 1999-06)
      A contact mechanical model for the winding nip, consisting of the wound roll, winding drum and the intervening sheet, is presented. The roll and drum are modeled as linear, orthotropic, homogeneous cylinders with a rigid ...

    • Containerboard and printing paper wound-on-strain measurements on a pilot winder 

      Jorkama, Marko; Palo, Pekka (Oklahoma State University, 2015-06)
      Wound-On-Strain (WOS) measurement arrangement was set up on a single drum pilot-winder in the Winding Research Center of Valmet Technologies Inc. in Finland. The measurement was implemented with two Laser Doppler Velocimeters ...

    • Control and online tension reference optimization in winding systems: Application to an identified three-motors simulator 

      Knittel, D.; Bourgin, P.; Boutaous, M. (Oklahoma State University, 2005-06)
      It is well known that the tension reference value, which a priori guarantees a good quality roll, is based on the stress generated within the roll. However, due to the imperfections of the winding systems and to the limited ...

    • Control design for longitudinal web dynamics: Benefits and drawbacks of robust control approaches 

      Knittel, Dominique; Frechard, Jonathan; Martz, Yannick (Oklahoma State University, 2013-06)
      Web tension and speed are two key variables to be monitored and controlled in order to achieve the expected final product quality. One of the main objectives in web handling plants is to reach an expected web speed while ...

    • Control of longitudinal tension in multi-span web transport systems during start up 

      Reid, Karl N.; Lin, Ku-Chin (Oklahoma State University, 1993-06)
      The control of longitudinal tension in a multi-span web transport system during start up is studied using first-principles modeling and digital simulation. Since start-up problems normally involve large variations of system ...

    • Control of registration accuracy of R2R gravure for fabricating inexpensive electronic devices 

      Lee, Wookyu; Koo, Hyunmo; Yeom, Dong Sun; Oh, Jung-who; Cho, Gyoujin (Oklahoma State University, 2013-06)
      The errors of the overlay printing registration in roll-to-roll (R2R) gravure are generated from many sources such as uneven web tension, thermal expansion and contraction of plastic web, uneven impression roll pressure, ...

    • Control of strip tension in the heating/cooling sections of continuous annealing lines using model-based tension estimation 

      Lu, Youwei; Jee, Changwoon; Pagilla, Prabhakar R. (Oklahoma State University, 2015-06)
      Continuous annealing lines are productive manufacturing lines used by steel making companies for the manufacture of thin steel sheet products. In these lines, the steel strip is continuously heated and cooled depending on ...

    • Control of the web lateral position and slope by employing spatially dependent transfer functions 

      Cobos Torres, Edison O.; Pagilla, Prabhakar R. (Oklahoma State University, 2019-06)
      In this work, we employ a non-dimensional state space representation of the spatially dependent lateral transfer functions to study web lateral position behavior in response to lateral displacement and rotation of the guide ...

    • Controller gain scheduling in a multi-span web line 

      Reish, Benjamin D.; Reid, Karl N. (Oklahoma State University, 2019-06)
      Gain scheduling is a common method of variable gain feedback control used to account for changes in the diameters of an unwind roll and a rewind roll during the operation of a web line. This paper focuses on three methods ...

    • Controlling static on an unwinding roll 

      Robinson, K. (Oklahoma State University, 2011-06)
      Excessive static charges on insulating webs are the root cause for a number of problems in roll-to-roll manufacturing operations. Static charges attract contaminants and cause discharges that can ignite flammable vapors, ...

    • Coupling between out-of-plane displacement and lateral stability of webs in air-support ovens 

      Moretti, P. M.; Chang, Y. B. (Oklahoma State University, 1995-06)
      In drying ovens where the web zig-zags over and under air-support bars, the web sometimes drifts to one side or the other until it runs into the oven wall. This divergence is shown to be coupled to out-of-plane displacements ...

    • Coupling of winding models and roll quality instruments 

      Mollamahmutoglu, C.; Bulut, O.; Adari, S.; Good, J. K. (Oklahoma State University, 2015-06)
      Winding models have been under development for roughly 50 years. These models have become mature in their ability to predict the internal residual stresses within a wound roll as a function of winder type, winder operating ...

    • Deflection and critical velocity of rollers 

      Shelton, J. J. (Oklahoma State University, 1995-06)
      A coordinate system with its origin at the center of the roller, and with the origin moving as the roller deflects, is used for solution of the fourth order differential equation of beam mechanics. The result is a continuous ...

    • Deformation in shear slitting of polymeric webs 

      Lu, H.; Wang, B.; Iqbal, J. (Oklahoma State University, 2001-06)
      Shear slitting of a 25.4 μm thick polypropylene web was conducted on a laboratory slitter using a pair of rotary blades at a constant speed up to 5.08 m/s under controlled tension. The effect of web speed on the slit-edge ...

    • Deformation of highly compressed wound rolls 

      Benson, R. C.; LaFleche, J. E.; Stack, K. D. (Oklahoma State University, 1995-06)
      This study concerns the loss of lap tension and interlayer pressure in a wound roll due to the compression of the web. Compression of the web thickness also affects the amount of material that may be wound into a roll of ...

    • Design of contoured rollers for web spreading 

      Markum, R. E.; Good, J. K. (Oklahoma State University, 2001-06)
      Contraction of a web in the cross width direction while running over rollers can be traced to runability problems and wound roll defects. These defects may include troughing, baggy lanes, wrinkles and registration difficulties ...

    • Design of fixed structure controllers for web tension control 

      Pagilla, P. R.; Cimino, M.; Knittel, D. (Oklahoma State University, 2007-06)
      It is a common practice in industry to design a Proportional-Integral (PI) velocity feedback controller cascaded with a PI outer tension loop to regulate web velocity and tension to their desired values. The controller ...