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Fully nonlinear solution to the stresses inside wound rolls
(Oklahoma State University, 1999-06)
The Hakiel approach has been the accepted method for calculating stresses in wound rolls. It determines the stress in rolls by summing the stress induced by wraps of film applied to the roll surface. This approach is called ...
Film surface considerations for enhanced winding of thin films
(Oklahoma State University, 1997-06)
The primary defect for thin films ( < 25μm ) consists of sinusoidal ridges that run around the wound roll of film. Previous work has shown that these defects are buckles caused by compressive stresses in the transverse ...
Optimization of equipment and process conditions for film winding
(Oklahoma State University, 1999-06)
Mathematical modeling of film winding has progressed to a point where it can offer much insight into the mechanics of this process. However, experience and testing on the actual hardware are still necessary to maximize ...
Differentially driven S-wrap rolls for improved tension isolation
(Oklahoma State University, 1997-06)
Achieving adequate tension isolation is necessary in both the manufacture and subsequent processing of webs of all types. Several techniques currently are available including nips, vacuum rolls, driven rolls and S-wraps. ...