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Now showing items 11-20 of 46
Stresses within rolls wound in the presence of a nip roller
(Oklahoma State University, 1991-05)
Models which can be used to calculate the internal stresses within wound rolls of web material have all been confined to the center winding technique to date. In this publication a new boundary condition is presented which ...
Entrained air films in center wound rolls - with and without the nip
(Oklahoma State University, 1997-06)
Development of analytical expressions predicting the thickness of fluid layers in the area of a foil bearing has been ongoing for nearly forty years. These expressions have been adapted to include air as the lubricating ...
Modeling nip induced tension in wound rolls
(Oklahoma State University, 2001-06)
Web materials are wound into coils by a variety of winders. Some winders center wind only. In this type of winding torque is provided to a core and web winds up on the core. Other types of winders have a roller, often ...
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 ...
Buckling of orthotropic webs in process machinery
(Oklahoma State University, 2003-06)
Many webs in web process machinery exhibit out-of-plane deformations, defined as troughs, in free web spans between rollers. In other cases when the troughs become severe the out-of-plane web deformations will begin to ...
Impact of thickness measurement on predicting residual stresses due to winding
(Oklahoma State University, 2015-06)
Axisymmetric winding models were initially developed to deal with web thickness variations that were manifested in the machine and cross machine direction. The web thickness variation is a prime input to these models. Small ...
Web wrinkling resulting from moment transfer
(Oklahoma State University, 2013-06)
Considerable research has been focused on the impact of roller misalignment on web instability. Early work focused on the prediction of trough instabilities in the entering span, just upstream of the misaligned roller [1]. ...
Impact of large deformations of webs transiting rollers
(Oklahoma State University, 2017-06)
Webs are subjected to large out-of-plane deformations when transiting rollers in process machinery. Webs are often treated as membranes in analysis but become subject to significant bending strains when transiting rollers. ...
Behavior of webs transiting crowned rollers
(Oklahoma State University, 2013-06)
Crowned rollers are known to center running belts by observation. Crown can be an unintentional artifact of rollers whose surfaces are machined on lathes while supported at their ends. The bending stiffness of the rotating ...
Shear wrinkling in isolated spans
(Oklahoma State University, 1997-06)
Web wrinkling is a problem which plagues the web process industry. Most webs are quite thin, on the order of 4-150 μm, and become subject to lateral shear during transport either by misaligned rollers or by guide rolls. ...