Browsing OSU - International Conference on Web Handling by Title
Now showing items 56-75 of 429
-
Compressive modulus measurement techniques
(Oklahoma State University, 1999-06)The compression testing of stacks of sheet materials is done to learn the behavior of the group of sheets, a behavior that is quite different from that of a solid, or even one single thick sheet of the same material. Many ... -
Computation of span length variations due to out-of-round material rolls
(Oklahoma State University, 2009-06)It is well known that non-ideal elements such as out-of-round/eccentric material rolls affect web tension. However, the mechanism through which these non-ideal components induce tension oscillations was not clear previously. ... -
Computations of air films and pressures between webs and rollers for steady and unsteady operating conditions
(Oklahoma State University, 1997-06)Numerical computations have been performed to predict the lubricating air film thickness and pressure for the entire region of smooth rotating support rollers wrapped by moving impermeable and permeable webs. Results have ... -
Computer simulation of web dynamics
(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 ... -
Computing wound roll stresses based upon web surface characteristics
(Oklahoma State University, 1993-06)Historically wound roll models have required the input of a radial modulus of elasticity. Heretofore this modulus has been measured using material testing systems which have shown the radial modulus to be dependent upon ... -
Concerning wound mill roll quality and take-up tension control
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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 ...