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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. ...
Winding mechanics of laminate webs
(Oklahoma State University, 2017-06)
Models that describe the residual stresses due to winding single layer webs at the end of roll-to-roll manufacturing machines are mature. These models have been used to reduce or avoid defects that are due to winding. Many ...
Axisymmetric wound roll models
(Oklahoma State University, 2009-06)
Axisymmetric wound roll models provide the greatest definition of wound roll internal stresses to date. Simple one dimensional models can provide the user with radial profiles of pressure and circumferential stress as a ...
Axisymmetric nonlinear transient thermo-elastic winding model
(Oklahoma State University, 2015-06)
Temperature is among the most important environmental factors which play a crucial role on the mechanical state of wound rolls of web material. Existing literature include studies concerning the thermal characterization ...
Design of contoured rollers for web spreading
(Oklahoma State University, 2001-06)
Contraction of a web in the cross width direction while running over rollers can be traced to runability problems and wound roll defects. These defects may include troughing, baggy lanes, wrinkles and registration difficulties ...
Measurement of nip induced tension and contact stresses
(Oklahoma State University, 2009-06)
Wound-on-Tension (WOT) is the tension in the outermost layer of a winding roll that is created due to the incoming web tension and the tension induced by the nip roller called Nip-Induced-Tension (NIT). Kandadai and Good ...
Effect of air entrainment in centerwound rolls
(Oklahoma State University, 1993-06)
Internal stress models for centerwound rolls have existed for over thirty years but no model to date has accounted for air which is entrained due to the web velocity and the viscosity of air. This paper reports the results ...
Modeling wound rolls using explicit FE methods
(Oklahoma State University, 2007-06)
A new method of wound roll analysis using an explicit finite element formulation is presented in this paper. The stresses developed in center wound rolls with and without an undriven nip roller are discussed and compared ...