OSU - International Conference on Web Handling: Recent submissions
Now showing items 61-80 of 429
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Guidelines for allowable in-plane roller misalignment using wrinkling and web break models
(Oklahoma State University, 2013-06)While we have had wrinkling and web break models for a quarter century and the means for precision roller alignment for a half century, no consistent recommendations have been made as to allowable tolerances for roller ... -
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. ... -
Comparison of control strategies for roll-to-roll printing presses
(Oklahoma State University, 2013-06)Flexible printed electronics is touted to be a significant part of the future of the roll-to-roll (R2R) printing industry. Electronic devices, such as RFID tags, low-cost displays and lighting devices, polymer solar cells, ... -
Application of dimensional analysis to roll-to-roll manufacturing systems
(Oklahoma State University, 2013-06)In this paper, we investigate the application of dimensional analysis for R2R systems. First, dimensional form of governing equations for web tension and speed are transformed to non-dimensional form using dimensional ... -
Effect of winder type and web material properties on wound-on-tension
(Oklahoma State University, 2013-06)The choice of winder type for various web materials has long been a qualitative discussion. Web materials are vast and hence the range of web material properties is also vast. Valid but conflicting opinions for an optimal ... -
Modeling of the transport behavior of low modulus webs
(Oklahoma State University, 2013-06)We consider three key issues in this study for low modulus webs. First, transport in the high strain region is considered when the materials exhibit nonlinear and viscoelastic behavior. Second, in-plane biaxial strain is ... -
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 ... -
Evaluating the impact of non-uniform paper properties on web lateral instability on printing presses
(Oklahoma State University, 2013-06)Lateral instability of the paper web during printing may lead to several quality issues such as print misregistration, wrinkles, tracking issues, etc. The problem often leads to paper rejects and claims from printers. There ... -
On the governing equation for web tension with out-of-round rolls
(Oklahoma State University, 2013-06)In roll-to-roll (R2R) manufacturing the presence of non-ideal elements, such as out-of-round or eccentric rolls, induces periodical oscillations in the web tension signal. Model simulations based on ideal elements do not ... -
Modeling web behaviour in printing press and in printed electronics
(Oklahoma State University, 2013-06)VTT together with several companies in the printing value chain have studied web handling through the printing press. Studies have focused on the web tension formation mechanisms in printing which have an effect e.g. on ... -
Myth busters: Web handling and the power of modeling
(Oklahoma State University, 2013-06)Web handling is filled with myths and folklore about things to do and not to do, about how to design web paths, and about how to handle specific situations. The folklore and myths are often industry specific and many web ... -
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, ... -
Surface compression of wound rolls
(Oklahoma State University, 2013-06)Stress levels and profiles in the vicinity of contact between a wound roll and a nip or a rigid surface are important for the quality of the product during manufacturing or storage stages. Excessive or insufficient pressure ... -
Lateral dynamics simulation of webs having cross-machine direction variation
(Oklahoma State University, 2013-06)Webs often include sectional variation in caliper or modulus of elasticity as a result of undesirable manufacturing variation or by intentional design. These variations influence wrinkle formation and tracking control in ... -
Influence of heating on tensile and relaxation behavior of wet paper
(Oklahoma State University, 2013-06)The influence of increasing temperature on the strength and relaxation of wet never-dried paper was studied using C-IMPACT, a tensile tester equipped with a special heating chamber. The heating device formed a small climate ... -
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 ... -
Gauge optimization of the reference tension and nip-load in winding systems using wound internal stresses calculation
(Oklahoma State University, 2013-06)In the winding process, the quality of the roll is directly related to its stress state. The winding tension and nip-load are the most significant parameters which play an important role in the stresses generated within a ... -
Wrinkle initiation and development in heated webs on drums
(Oklahoma State University, 2013-06)Wrinkles often occur in webs heated on drums and rollers. Anecdotal evidence from vacuum metalizers suggests that wrinkles are initiated by small grit particles or surface imperfections that lift the web off the drum. An ... -
Behavior of a flexible web in contact with a roller
(Oklahoma State University, 2013-06)In the contact patch between a web and a roller, there may be regions of stick and microslip or full slip. Within the stick zone, the velocities of web and roller surface match, but in the microslip zone they differ by a ... -
Web tension regulators - control heuristics
(Oklahoma State University, 2013-06)Classical Control Theory using closed-loop controllers has been applied to drives for web handling beginning in the 1940's. Back then the mathematics was ahead of the tools for analysis as well as the modeling and the drive ...