Web Tension

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Web Tension

The force used to pull paper through a web press, which is a printer using a roll to churn out paper. Too much or too little web tension affects the quality of the print job.
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The outputs of such system are web tensions and web velocities; and the inputs of the controlled system are the maximum velocity of the web with predefined values of tensions.
--Outputs are, respectively, winding and unwinding web tensions [T.sub.w], [T.sub.u] and the web velocity [v.sub.3].
[8] proposed used linear matrix inequalities (LMIs) approach for decentralized control design to minimize variations in web tension, however the disturbances in web velocity has not be considered.
Pagilla, "Design and implementation of adaptive PI control schemes for web tension control in roll-to-roll (R2R) manufacturing", 7SA Trans, 2014.
It can be application engineered for a variety of diameters, web widths, web tensions and line speeds.
When winding a laminated web of several different materials, to obtain the suggested maximum web tensions for laminated structures, simply add the maximum web tensions for each of the materials that have been laminated together (usually disregarding any coatings or adhesives) and apply the sum of these tensions as the maximum web tension for the laminate.
The winding tools to develop roll hardness are web tension, nip pressure (from a pressure or lay-on roll or winding drum) and winding torque from a center drive when center/surface winding film webs.
1, the web tension is produced by the winding torque from a center drive.
The amount of starting and finishing web tension for a specific material often must be determined empirically.
The nip loading is less material dependent than web tension and will vary greatly with the material and the amount of roll hardness required.
In addition, we offer a variety of different drive systems including AC Vector, DC Regen and our own proprietary unwind Tension Control system for higher web tensions.
Web tensions can be matched to suit the properties of the film.