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Now showing items 11-20 of 126
Impacts of a 90 degree twist on lateral web dynamics
(Oklahoma State University, 2015-06)
Twists are sometimes used to turn or provide passive lateral control for narrow webs in those cases where space for a sufficient twist span length (to avoid a wrinkle) is achievable. This paper uses the finite element ...
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 ...
Roll variability analysis for non-statisticians
(Oklahoma State University, 2019-06)
Roll variability can be characterized by several different methods. Off line cross-direction (CD) scans of thickness or coat weight give a snapshot of CD variation over a small machine-direction (MD) range. Roll hardness ...
Effect of mass transfer on multi-span lateral dynamics of nonuniform webs
(Oklahoma State University, 2017-06)
Since the publication of Shelton's original work [1] on lateral web dynamics in 1968, the cambered1 web has attracted the attention of researchers. Shelton, himself, felt it was a natural "next step" in lateral dynamics. ...
Development of intelligent plastic film winder "Windstar"
(Oklahoma State University, 2015-06)
Flexible continuous plastic films are used to produce various products, including optical films and packaging materials, because plastic film is suited to use in mass production manufacturing processes. Generally, the web ...
Explicit analysis of the lateral mechanics of webs transiting concave rollers
(Oklahoma State University, 2011-06)
All previous analyses of webs encountering spreading devices have required enforcement of assumed boundary conditions. An example is the normal entry boundary condition which has been employed in many web/roller analyses. ...
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 ...
Modeling and computer simulation of zero speed splice unwinds
(Oklahoma State University, 2017-06)
A computer program for conducting model simulations for zero speed splice unwinds is described in this paper. A typical unwind system consisting of the unwinding material roll, festoon, dancer, and pull rolls is considered. ...