Browsing OSU - International Conference on Web Handling by Title
Now showing items 368-387 of 429
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Ultrasonic based multiple web sensing for lateral control application
(Oklahoma State University, 2009-06)As sensing requirements in guiding applications increase in complexity, innovation must increase to meets these needs. In applications with multiple webs, space restrictions often limit the placement of sensors. In this ... -
Understanding friction
(Oklahoma State University, 1999-06)Friction plays a critical role in many web handling and winding problems in the paper industry. Although these problems can often be reduced to simple mechanical models, the models require the coefficient of friction of ... -
Unexpected wrinkling mechanism in thin webs
(Oklahoma State University, 2019-06)Wrinkles and creases are a particular problem in thin web materials, leading to functional and visual defects. Their precursor is the wavy pattern in spans between rollers. Troughs running along or close to the machine ... -
Unified model for longitudinal and lateral web dynamics
(Oklahoma State University, 2019-06)In "The Effect of Mass Transfer on Multi-Span Lateral Dynamics of Uniform Webs" [1], it is shown that behavior of Shelton's lateral dynamic beam model [2] can be explained as the interaction of the normal entry equation ... -
Unwind and rewind guiding
(Oklahoma State University, 1993-06)Lateral control of a web through a process line involves the use of web guides and control systems at different points in the process. There are three general areas for guiding. Guides are typically located at the terminal ... -
Updated model for lateral displacement of nonuniform webs
(Oklahoma State University, 2009-06)The theory for lateral mechanics of nonuniform webs in the open literature is believed to be flawed and an updated theory is presented. The theory is based on beam theory and a set of boundary conditions. The so-called ... -
Use of conservation of mass in modeling lateral behavior in moving webs
(Oklahoma State University, 2011-06)Though conservation of mass has played a prominent role in modeling longitudinal tension, it has seen limited use in modeling problems where lateral behavior is important. This may be due to the fact that most lateral ... -
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
(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 ... -
Using a winding model to reduce winding defects
(Oklahoma State University, 2017-06)As a roll is wound, stresses in the roll develop - and change as the roll builds. The stresses on each layer in the wound roll influence whether the roll is likely to telescope, star, cinch, yield, block or ooze - to name ... -
Using finite element model to define how wrinkles form in a single web span without moment transfer
(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 ... -
Using FSRs to measure radial pressure in wound rolls
(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 ... -
Using roll hardness to screen for excessive web bagginess
(Oklahoma State University, 2013-06)Various methods are available for quantifying bagginess. But they can be tedious and impractical in a production setting. Often one just needs to know if a roll is too baggy to run without wrinkling during converting. ... -
Variable-gain control of longitudinal tension in a web transport system
(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 ... -
Variation of the web tension at the roll change in the printing press
(Oklahoma State University, 1995-06)Rapid changes of the web tension take place at the roll change in the printing press. Variations in the machine direction depend on the tension control system and variation in the cross direction is strongly affected by ... -
Vibration and stability of axially moving webs coupled to surrounding air
(Oklahoma State University, 2003-06)High-speed web flutter is of significant importance in a variety of paper, plastics, textiles, and sheet metal industries. The natural frequencies of vibration and the onset of flutter in thin, wide, high-speed webs are ... -
Vibration of two axially translating media interconnected by Winkler elastic foundation
(Oklahoma State University, 2007-06)Transverse vibrations of two translating strings interconnected by a Winkler elastic foundation, and subjected to axial loading are investigated. The natural frequencies are composed of two infinite sets, representing ... -
Viscoelastic web curl due to storage in wound rolls
(Oklahoma State University, 2019-06)While bending strains result from any web being wound at a radius of curvature into a roll, these bending strains are largest for the thicker homogeneous webs and laminates. Many webs are viscoelastic on some time scale ... -
Web bagginess: Making, measurement and mitigation thereof
(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
(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
(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 ...