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Now showing items 1-10 of 22
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. ...
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. ...
New model for the steady state deformation and friction of webs on rollers
(Oklahoma State University, 2017-06)
A web moving through process machinery interacts with rollers through frictional forces, which may change its direction of motion and tension. By modelling the web as a beam, these forces can be calculated from its tension, ...
Using a winding model to reduce winding defects
(Oklahoma State University, 2017-06)
As a roll is wound, stresses in the roll develop - and change as the roll builds. The stresses on each layer in the wound roll influence whether the roll is likely to telescope, star, cinch, yield, block or ooze - to name ...
Spatially dependent transfer functions for web lateral dynamics
(Oklahoma State University, 2017-06)
In this paper we derive spatially dependent transfer functions for web span lateral dynamics which provide web lateral position and slope as outputs at any location in the span; the inputs are guide roller displacement, ...
Wrinkling mechanisms of webs with spatially varying material properties
(Oklahoma State University, 2017-06)
Webs often include variation in caliper or modulus of elasticity as a result of manufacturing variation. Light-weight nonwoven webs are especially prone to these issues because the variation is proportionally more, relative ...
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 ...
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. ...
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 ...
Preventing negative issues at nip roller
(Oklahoma State University, 2017-06)
Dealing with film scratches, wrinkles, and air entrapment is a problem that many converters are faced with on a regular, if not daily basis. Part of the problem is the rollers they have to work with at the nip point. ...