Search
Now showing items 31-40 of 126
Exploring the strain transport formula
(Oklahoma State University, 2019-06)
The strain transport formula relates the velocity of a moving web to its strain. It is based on the conservation of mass which, when applied to webs, becomes the conservation of relaxed length. Simply stated it says, the ...
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 ...
Controller gain scheduling in a multi-span web line
(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 ...
Control of the web lateral position and slope by employing spatially dependent transfer functions
(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 ...
Tension disturbances in a turret winder
(Oklahoma State University, 2019-06)
Turret winders are designed to produce batches of rolls from a continuously moving web. Typically, two spindles are mounted on a turret, 180 degrees apart. The winding roll remains in the inside (winding) position until ...
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 ...
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. ...
Spatially dependent transfer functions for web lateral dynamics
(Oklahoma State University, 2017-06)
In this paper we derive spatially dependent transfer functions for web span lateral dynamics which provide web lateral position and slope as outputs at any location in the span; the inputs are guide roller displacement, ...
Photonic curing for enhancing the performance of roll-to-roll printed electronic devices
(Oklahoma State University, 2019-06)
The advent in printing technology promotes the possibility of roll-to-roll manufacturing process for low-cost, high throughput, and large area printing of the electronic devices in flexible substrate materials. However, ...
Modeling slip between a web and a roller
(Oklahoma State University, 2019-06)
In roll-to-roll processes, slip between a web and a roller may be considered a defect. Slip can cause scratches which can be detrimental to a product, if not catastrophic. As line speeds increase to meet demands for more ...