Now showing items 1-20 of 429

    • Wound roll stresses from displacement measurements 

      Roisum, David R. (Oklahoma State University, 1991-05)
      Previous wound roll models required a known Wound-In-Stress boundary condition that is easily obtainable only for the restrictive case of pure center winding with measured incoming web tension and caliper. A new boundary ...
    • Using finite element model to define how wrinkles form in a single web span without moment transfer 

      Gopal, H.; Kedl, D. M. (Oklahoma State University, 1991-05)
      This paper describes a finite element model that successfully predicts the formation of troughs and shear wrinkles in plastic webs for a single span bounded by two idler rollers. For this model, wrinkles are created when ...
    • Computer simulation of web dynamics 

      Fox, Scott J.; Lilley, David G. (Oklahoma State University, 1991-05)
      Explicit finite difference schemes for modeling one-dimensional, transient web dynamics are designed, developed and tested. A sequence of numerical experiments are performed to ascertain the effects of various parameters ...
    • Edge flutter in webs 

      Chang, Y. B.; Moretti, P. M. (Oklahoma State University, 1991-05)
      A persistent problem in paper machines and other webs subjected to drying air flows is edge flutter. The resulting stresses can damage the edges, initiate tears and breaks in paper machines, or spoil coatings near the edges ...
    • Bobbin stresses generated by wire winding 

      Metzinger, Kurt; Attaway, Steve; Mello, Frank (Oklahoma State University, 1991-05)
      The prediction of bobbin stresses generated by wire winding is now possible by combining a finite element structural code and a rigid body motion code. In this combination of computer codes, the bobbin and the individual ...
    • Using FSRs to measure radial pressure in wound rolls 

      Good, J. K.; Fikes, M. W. R. (Oklahoma State University, 1991-05)
      The Force Sensing Resistor (FSRTM)1 is a device which changes resistance in a predictable manner with the application of force on its surface.[1] The FSR has been used in a variety of applications since its invention in ...
    • Stresses within rolls wound in the presence of a nip roller 

      Good, J. K.; Wu, Z.; Fikes, M. W. R. (Oklahoma State University, 1991-05)
      Models which can be used to calculate the internal stresses within wound rolls of web material have all been confined to the center winding technique to date. In this publication a new boundary condition is presented which ...
    • 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 ...
    • Determination of wound roll structure using acoustic time of flight measurement 

      Swanson, R. P. (Oklahoma State University, 1991-05)
      Roll structure measurement is presently done with destructive and intrusive measuring devices, such as FSR's or with specially instrumented winders. These methods are generally limited to research and development applications. ...
    • 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 ...
    • Sensors and signal processing: An optical edge sensor for transparent film applications 

      Gronquist, D. (Oklahoma State University, 1991-05)
      Sensing the edge of transparent film webs has always been somewhat difficult. Optical sensors typically see through the low opacity webs while pneumatic, ultrasonic and other sensors have their own sets of unique problems.
    • Cause and effects of tension in a draw-controlled web process line 

      Shelton, John J. (Oklahoma State University, 1991-05)
      There is a common belief, supported by several technical papers and bulletins, that the tension in a web increases with velocity by the addition of the term mV^2 to the tension in a stationary web. This concept of a tension ...
    • How core stiffness and Poisson ratio affect energy balance roll structure formulas 

      Pfeiffer, J. D.; Hamad, W. Y. (Oklahoma State University, 1991-05)
      The stiffness of the core determines how much support it will offer for the initial wraps of web material, and whether this support will be maintained as internal pressures are developed. An expression is developed for ...
    • On the effect of width direction thickness variations in wound rolls 

      Hakiel, Z. (Oklahoma State University, 1991-05)
      A first order model has been developed, which predicts the widthwise variability in wound roll diameter and stresses. This model has been verified experimentally on wound rolls of film and qualitative agreement between the ...
    • Mechanical states in wound heterogeneous tapes by the finite element method 

      Thomas, R. K. (Oklahoma State University, 1991-05)
      The problem of predicting the mechanical stress and deformation states in wound tapes that result from the winding process addressed by application of the finite element method. The generally heterogeneous tape construction ...
    • Using a two dimensional winding model to predict wound roll stresses that occur due to circumferential steps in core diameter or to cross-web caliper variation 

      Kedl, D. M. (Oklahoma State University, 1991-05)
      This paper describes a model for estimating the stresses throughout a wound roll as a function of both radius and width. Width direction stresses are influenced by non-uniform winding tensions created through stacking ...
    • Variable-gain control of longitudinal tension in a web transport system 

      Reid, K. N.; Shin, K. H. (Oklahoma State University, 1991-05)
      Fixed-gain and variable-gain PID control of longitudinal tension in the winding section of a simple web transport system were evaluated. An open-loop mathematical model for the web transport system was derived and used for ...
    • Winding problems with rotogravure jumbo-rolls 

      Welp, E. G. (Oklahoma State University, 1991-05)
      The production and conversion of jumbo rolls presents a challenge to all involved in the production process. This presentation shows that as reel dimensions continue to increase, limits are being reached with regard to ...
    • Japanese patents investigation report on web handling technology 

      Ohnishi, S.; Matsumoto, K.; Walker, T. (Oklahoma State University, 1991-05)
      In order to initiate programs in web handling, it is necessary to understand the technical vector that has developed in the field. In this paper we have investigated 1784 Japanese patents on web handling technology that ...
    • Mechanical stress states in heterogeneous, wound rolls 

      Reuter, R. C., Jr. (Oklahoma State University, 1991-05)
      This paper presents a method of predicting the internal stress states in rolls simultaneously wound with independent supply spools of dissimilar material. The method is based on linear, orthotropic behavior of the mandrel ...