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Now showing items 21-30 of 46
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 ...
Predicting web wrinkles on rollers
(Oklahoma State University, 2009-06)
There are two levels of web instability in web lines. The first level of web instability is called web troughs. Web troughs are due to the instability of webs that occur in free web spans. Web troughs have been shown to ...
Wound-in-tension in a non-woven web
(Oklahoma State University, 2005-06)
Literature on wound roll structure of non-homogeneous webs is scarce. Experimental and analytical research on wound roll structure of homogeneous materials such as plastic films and paper has been reported extensively, ...
Wrinkling of webs due to twist
(Oklahoma State University, 1999-06)
Webs are often required to endure twisting in web process machinery. There is a limit to the degree to which the web can be twisted prior to wrinkling. The objective of this publication is to document a closed form technique ...