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Now showing items 381-390 of 429
Variation of the web tension at the roll change in the printing press
(Oklahoma State University, 1995-06)
Rapid changes of the web tension take place at the roll change in the printing press. Variations in the machine direction depend on the tension control system and variation in the cross direction is strongly affected by ...
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, ...
Study on strip crossbow correction for uniform coating weight control
(Oklahoma State University, 2015-06)
In coating process of continuous galvanizing line, transverse crossbow is frequently found in the case of thick gage or high strength steel processing. This transverse crossbow arises due to the unbalanced residual stress ...
Bagginess and baggy streaks: A novel measurement technique to quantify tension profile of a web in cross-direction at high resolution
(Oklahoma State University, 2011-06)
A tension beam was designed to quantify cross-directional tension profile of a moving web at high resolution and high accuracy. The beam, composed of 50 individual Teflon pads resting on load cells, allows the measurement ...
Wound roll structures and practical applications
(Oklahoma State University, 2019-06)
Winding is an integral process in the manufacturing and converting of nearly all web materials such as paper, film, tissue, nonwovens, aluminum and steel. Wound rolls are the most convenient, economical, and most prevalent ...
Web instability at open draw and its impact on paper machine efficiency
(Oklahoma State University, 2015-06)
Paper machine efficiency is mostly affected by machine down time, resulting from maintenance work and web breaks. One of the main factors affecting breaks is the web instability at open draws on paper machines, especially ...
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 ...
Mechanical stress states in heterogeneous, wound rolls
(Oklahoma State University, 1991-05)
This paper presents a method of predicting the internal stress states in rolls simultaneously wound with independent supply spools of dissimilar material. The method is based on linear, orthotropic behavior of the mandrel ...
Traction in web handling: A review
(Oklahoma State University, 2001-06)
In web processes, at least one moving machine component must drive the material through a friction force at the interface. This force, or traction, inevitably falls as speed increases, and is accompanied by a degree of ...
Optimizing idler diameter
(Oklahoma State University, 2017-06)
The idler is probably the most common roller in web handling, but it is one of the least studied. It influences both the highest and lowest tension we can run, and can defeat the most sophisticated tension control schemes. ...