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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 ...
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 tension regulators - control heuristics
(Oklahoma State University, 2013-06)
Classical Control Theory using closed-loop controllers has been applied to drives for web handling beginning in the 1940's. Back then the mathematics was ahead of the tools for analysis as well as the modeling and the drive ...
Control design for longitudinal web dynamics: Benefits and drawbacks of robust control approaches
(Oklahoma State University, 2013-06)
Web tension and speed are two key variables to be monitored and controlled in order to achieve the expected final product quality. One of the main objectives in web handling plants is to reach an expected web speed while ...
Effect of winder type and web material properties on wound-on-tension
(Oklahoma State University, 2013-06)
The choice of winder type for various web materials has long been a qualitative discussion. Web materials are vast and hence the range of web material properties is also vast. Valid but conflicting opinions for an optimal ...
Gauge optimization of the reference tension and nip-load in winding systems using wound internal stresses calculation
(Oklahoma State University, 2013-06)
In the winding process, the quality of the roll is directly related to its stress state. The winding tension and nip-load are the most significant parameters which play an important role in the stresses generated within a ...
Control of registration accuracy of R2R gravure for fabricating inexpensive electronic devices
(Oklahoma State University, 2013-06)
The errors of the overlay printing registration in roll-to-roll (R2R) gravure are generated from many sources such as uneven web tension, thermal expansion and contraction of plastic web, uneven impression roll pressure, ...
Machine and transverse direction errors in webs: Diagnosis and remedies
(Oklahoma State University, 2013-06)
The primary focus of web handling is often on tension control; however, equally important to almost any web handling or winding process is to maintain machine (MD) and transverse direction (TD) control of the web. This ...
Method for calculating catenary web spans
(Oklahoma State University, 2013-06)
The methods for calculating the catenary droop of a wire or cable hanging from fixed supports are well understood. For many common web materials, catenary droop or sag is not a consideration but for webs having a significant ...
Modeling of the transport behavior of low modulus webs
(Oklahoma State University, 2013-06)
We consider three key issues in this study for low modulus webs. First, transport in the high strain region is considered when the materials exhibit nonlinear and viscoelastic behavior. Second, in-plane biaxial strain is ...