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Now showing items 61-70 of 153
Wrinkling of webs on rollers and drums
(Oklahoma State University, 2005-06)
Wrinkles are frequently observed in thin webs wrapping rollers, winding cores, and drums in vacuum coaters. They are the buckling response of the web to compressive deformation in the transverse direction (TD), which may ...
Wound roll generated unstable vibration on a two-drum winder
(Oklahoma State University, 2005-06)
Nip contact between the paper roll, winding drum and rider roll or some other nip roller may cause that the wound roll is deformed into a convex polygon. This deformation process is accompanied with a strong vibration. The ...
In-roll stress analysis considering air-entertainment at the roll-inlet with the effect of grooves on nip roll surface
(Oklahoma State University, 2005-06)
High-speed winding of paper web sometimes leads the winding system into unstable states, interlayer slippage of wound roll, paper breakage and so on, due to the excessive air-entrainment at the roll-inlet of nip contact ...
New method for analyzing the deformation and lateral translation of a moving web
(Oklahoma State University, 2005-06)
A new method is presented for modeling the elastic behavior of webs conveyed over rollers. In addition to producing detailed descriptions of stress fields, it provides a new way of looking at problems that will help web ...
Laminate theory based 2D curl model
(Oklahoma State University, 2009-06)
The laminate theory provides a method of analyzing the mechanics of multilayer composite laminates. With the appropriate definition of the load vector, the laminate theory can be extended to model curl resulting from ...
Behavior of a thin flexible twisted web
(Oklahoma State University, 2007-06)
In an earlier IWEB paper, "A New Method for Analyzing the Deformation and Lateral Translation of a Moving Web" [5], a nonlinear PDE model, suitable for use with low-cost FEA software, was developed. That work considered ...
Investigation of fluid mechanics of slotted air-jets for air reverser applications
(Oklahoma State University, 2005-06)
The fluid mechanics of the air flow, caused by a series of impinging air-jets, in a constant-height, rigid channel is investigated using computational fluid dynamics (CFD). The primary goal of this work is to investigate ...
Wrinkle-free conveyance in nips
(Oklahoma State University, 2005-06)
Wrinkling in nips with ultra-thin webs is empirically studied. In web converting, nips are used for tension isolation drives, gravure coaters, prevention of air entrainment on rollers and winding rolls, calendaring, ...
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 ...
Aerodynamic dancer in web handling
(Oklahoma State University, 2007-06)
This paper discusses the aerodynamic dancer that is effective in a wide range of frequency and do not cause excessive lateral web deflection, touching, or flutter. An aerodynamic model of air-turn bar has been developed. ...