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Longitudinal slip in rolling contact
(Oklahoma State University, 2013-06)
In printing machines incorporating indirect printing technology, the image or pattern is first printed onto a blanket cylinder having an elastic rubber surface. Subsequently, the pattern is transferred to the substrate. ...
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 ...
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 ...
Effects of parameter uncertainties on longitudinal web dynamics
(Oklahoma State University, 2013-06)
Web handling systems are very common in industry for metal, paper, textile and polymer material treatments. The key variables to monitor and control are the web speed and web tension in each span. The objective is to reach ...
Winding of plastic barrier films
(Oklahoma State University, 2013-06)
High quality plastic films are produced using the cast or blown film extrusion processes. Several kinds of resins are coextruded in a film of up to 11 layers to generate the best technical properties at competitive costs. ...
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 ...
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. ...
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. ...
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 ...