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Now showing items 51-60 of 153
Web handling for flexible display manufacture
(Oklahoma State University, 2005-06)
Flexible displays manufactured in a continuous roll-to-roll fashion are the "Holy Grail" of the display industry. This paper offers an assessment of the development efforts related to web handling, which are required to ...
Structural evaluation of roll quality and in-roll stress analysis using a novel on-line measurement technique
(Oklahoma State University, 2001-06)
In a previous paper (Jaafar et al., 1999) we reported on the rudimentary development of a new technique for the on-line measurement of a roll's coefficient of restitution (Cr) as it is being wound, and enunciated the ...
Deformation in shear slitting of polymeric webs
(Oklahoma State University, 2001-06)
Shear slitting of a 25.4 μm thick polypropylene web was conducted on a laboratory slitter using a pair of rotary blades at a constant speed up to 5.08 m/s under controlled tension. The effect of web speed on the slit-edge ...
Two-dimensional model to predict web-to-roller traction at small wrap angles
(Oklahoma State University, 2003-06)
We have studied the traction developed between a thin, flexible web and a rotating circumferentially grooved cylindrical roller. The traction model developed by Rice and Gans [1] is inadequate for small wrap angles, because ...
Effect of air-side leakage in roll winding
(Oklahoma State University, 2003-06)
In web winding processes, a thin layer of air is entrained into rolls during winding. This air reduces the interlayer pressure in the wound roll because the air acts like a sponge between adjacent web layers. Winding models ...
Control and online tension reference optimization in winding systems: Application to an identified three-motors simulator
(Oklahoma State University, 2005-06)
It is well known that the tension reference value, which a priori guarantees a good quality roll, is based on the stress generated within the roll. However, due to the imperfections of the winding systems and to the limited ...
On the durability of cores and rest roll dynamics
(Oklahoma State University, 2005-06)
The printing industry is facing the same challenges as many other industries, in that demand is increasing for its processes to run faster and more reliably. Roll weight, width and web speed are steadily increasing which ...
Simplified model for lateral behavior of short web spans
(Oklahoma State University, 2001-06)
For ratios of L/W less than approximately 2.0, the effects of shear stresses on the shape of a web must be considered. In basic manufacturing and processing of webs, such ratios are very common. The analysis of a general ...
Mechanics of a thin web wrapped helically about a turn bar
(Oklahoma State University, 2005-06)
The mechanics of the interactions between a flexible web and an externally pressurized air cushion is modeled. The web is wrapped around the porous cylindrical turn-bar at an oblique angle (helically). The turn-bar supplies ...
Design of fixed structure controllers for web tension control
(Oklahoma State University, 2007-06)
It is a common practice in industry to design a Proportional-Integral (PI) velocity feedback controller cascaded with a PI outer tension loop to regulate web velocity and tension to their desired values. The controller ...