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Now showing items 41-50 of 126
Modeling and frequency response of web tension with a pendulum dancer, and comparison of load-cell and dancer based tension control systems
(Oklahoma State University, 2011-06)
In web processing lines, web tension is typically regulated using an outer loop that provides a trim to the velocity reference of the inner velocity loop. The feedback signal for the outer tension loop is either a position ...
Impact of web permeability on high speed web transport
(Oklahoma State University, 2015-06)
Measurements of drag on a moving web in a multi-span festoon show a stronger than expected dependency on the porosity of the web with a highly non-linear relationship. The experiments suggest a wall shear stress 3-4 times ...
Wrinkling mechanisms of webs with spatially varying material properties
(Oklahoma State University, 2017-06)
Webs often include variation in caliper or modulus of elasticity as a result of manufacturing variation. Light-weight nonwoven webs are especially prone to these issues because the variation is proportionally more, relative ...
Modeling of nip pressures and web feed rates in rubber covered nip rollers
(Oklahoma State University, 2013-06)
Nip rollers are used extensively in converting processes; however, correct design and usage of these types of rollers requires a sound understanding of the mechanics of the nip in both the machine and cross-width directions. ...
Belated appreciation of Lisa Sievers' thesis
(Oklahoma State University, 2015-06)
In her 1987 thesis [1] and a follow-up paper in the IEEE Transactions of Automatic Control [2], Lisa Sievers described three dynamic multi-span models for lateral web behavior.
Modeling and analysis of rotogravure printing presses
(Oklahoma State University, 2011-06)
Print registration is the method of overlapping successive printed patterns to form a complex multicolor pattern. Registration error is the misalignment in the overlapped patterns. This paper deals with modeling machine ...
General model of lateral web dynamics between two reels
(Oklahoma State University, 2013-06)
A flexible web unavoidably deviates from its prescribed (linear) path during processing. The lateral web dynamics can be caused by tilt of rollers, web defects, off axis motion of the reels and other factors. In this work ...
Adaptive feedforward based control strategy for attenuation of periodic tension oscillations in roll-to-roll manufacturing
(Oklahoma State University, 2013-06)
Considering the aforementioned issues, an adaptive feedforward (AFF) algorithm that can work in parallel to an existing feedback control systems is developed for control of web tension and to attenuate periodic oscillations. ...
Combined stresses for webs going over rollers
(Oklahoma State University, 2015-06)
In research it is typical that only one source of stresses is studied at a time. In entry-level mechanics textbooks, you may see the occasional combined stresses taught where a couple of sources are superposed. Yet, seldom ...
Nip mechanics of nano-impression lithography in roll-to-roll process machines
(Oklahoma State University, 2017-06)
Nano-Impression Lithography (NIL) has been demonstrated to produce nano features on webs that have value to society. Such demonstrations have largely been the result of NIL processes that involve the discrete stamping of ...