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Now showing items 51-60 of 150
Optimization of equipment and process conditions for film winding
(Oklahoma State University, 1999-06)
Mathematical modeling of film winding has progressed to a point where it can offer much insight into the mechanics of this process. However, experience and testing on the actual hardware are still necessary to maximize ...
Stresses within rolls wound in the presence of a nip roller
(Oklahoma State University, 1991-05)
Models which can be used to calculate the internal stresses within wound rolls of web material have all been confined to the center winding technique to date. In this publication a new boundary condition is presented which ...
Entrained air films in center wound rolls - with and without the nip
(Oklahoma State University, 1997-06)
Development of analytical expressions predicting the thickness of fluid layers in the area of a foil bearing has been ongoing for nearly forty years. These expressions have been adapted to include air as the lubricating ...
Web tension control in an industrial accumulator
(Oklahoma State University, 1999-06)
This paper presents the study of an industrial accumulator used in a web transport system. In order to understand the main characteristics of the accumulator and the causes of problems appearing during transient phases, ...
Modeling web traction on rollers
(Oklahoma State University, 1995-06)
When web tension changes between entry and exit on a roller, the tension change occurs in a slip zone in the last part of the wrap, whose size is given by the well-known Capstan or Belt equation. A method for modelling ...
Concerning wound mill roll quality and take-up tension control
(Oklahoma State University, 1991-05)
Biaxially oriented web manufactured by the tenter method is first wound into a mill roll as the middle stage of the product roll manufacturing process. It is well known that mill roll winding quality greatly affects final ...
Determination of wound roll structure using acoustic time of flight measurement
(Oklahoma State University, 1991-05)
Roll structure measurement is presently done with destructive and intrusive measuring devices, such as FSR's or with specially instrumented winders. These methods are generally limited to research and development applications. ...
Effects of nip parameters on media transport
(Oklahoma State University, 1995-06)
The mechanics of a web being transported through a set of elastomeric rollers has been investigated. Three general classes of roller materials are identified. These nip materials are then characterized by the speed at which ...
Web tension measurements in the paper mill
(Oklahoma State University, 1991-05)
Web tension measuring methods and corresponding instruments have been evaluated at the Graphic Arts Laboratory of the VTT. Together with Valmet Paper Machinery, cross-web tension profiles have been studied in different ...
Web tension profiles as measured in a rewinder and in a printing press
(Oklahoma State University, 1993-06)
The web tension profile has been measured with an equipment called the CTSensor (Cross Tension Sensor) during ordinary production-runs both in rewinders and in newspaper printing presses. The measuring roller was placed ...