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Now showing items 311-320 of 429
Variable-gain control of longitudinal tension in a web transport system
(Oklahoma State University, 1991-05)
Fixed-gain and variable-gain PID control of longitudinal tension in the winding section of a simple web transport system were evaluated. An open-loop mathematical model for the web transport system was derived and used for ...
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 ...
Multiple-tension control using a new approach in signal-processing
(Oklahoma State University, 1997-06)
A new tension control system is described, which allows the simultaneous control of up to four actuators, such as drives, brakes or clutches. It incorporates four speed/torque control modules and three tension control ...
Lateral deflections of webs in air-flotation ovens
(Oklahoma State University, 2001-06)
A long web span supported by many, regularly spaced, alternating air-bars is studied. The focus is on the lateral forces on the web due to the interaction of lateral curvature with out-of-plane deflections. The effect of ...
Modeling web behaviour in printing press and in printed electronics
(Oklahoma State University, 2013-06)
VTT together with several companies in the printing value chain have studied web handling through the printing press. Studies have focused on the web tension formation mechanisms in printing which have an effect e.g. on ...
Winding problems with rotogravure jumbo-rolls
(Oklahoma State University, 1991-05)
The production and conversion of jumbo rolls presents a challenge to all involved in the production process. This presentation shows that as reel dimensions continue to increase, limits are being reached with regard to ...
Ke models: Theoretical dynamic subsystems of longitudinal web strain
(Oklahoma State University, 2011-06)
Efficient design and optimization of many production processes often require models which predict transient and steady state web strains. To date, much attention has been given to modeling web strains much less than unity. ...
Fully R2R gravure printed smart tags and related web handling challenges
(Oklahoma State University, 2013-06)
Although a smart tag which can communicate with a smart phone via NFC (Near Field Communication) has been considered as a core tool for bringing up the ubiquitous society, the difficulties in integrating 13.56 MHz RFID ...
Web flutter at circular-tube air-turn bars
(Oklahoma State University, 1997-06)
Circular tubes having air-emitting holes are often used for non-contact handling of photographic and magnetic media and for printed paper webs. One of the problems of circular-tube air-turn bars is their tendency to cause ...
Intelligent roll platform for better runnability
(Oklahoma State University, 2009-06)
An intelligent roll is a mechatronic system consisting of a roll in a web handling machine that is also used as a transducer for sensing cross machine tension or linear load. The intelligent roll has electret film force ...