Methods and apparatus for prescribing web tracking in processing equipment
AssigneePresstek, Inc.
InventorsNandakumar Vaidyanathan, Robert Bruce Lowd
Life of this patent
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Abstract
Methods and apparatus to reduce or eliminate misalignment, wrinkles, and creases in coated web product. A relationship between web outgassing pressure and surface roughness of the web and web transporting rollers is developed. This relationship allows for the control over the web outgassing pressure. The ability to adjust the web tension pressure, as well as the selection of web transporting rollers with prescribed surface characteristics, allows an operator to control the degree to which the web floats over or tracks the web transporting roller. A controller, in response to pressure and tension sensors, can also provide dynamic, closed-loop control of the entire system.
Claims5
An apparatus for adjusting operational tension pressure of a web, comprising:
- a web transporting roller;
- a pressure sensor responsive to the ambient pressure about the web transporting roller;
- a tension sensor responsive to the tension pressure of the web;
- and
- at least one web tensioning roller facilitating adjustment of the tension pressure of the web in relation to the ambient pressure and in response to an output from the pressure sensor.
An apparatus for adjusting operational tension pressure of a web, comprising:
- means for measuring ambient pressure about a web transporting roller;
- means for measuring web tension pressure of a web over the web transporting roller;
- and
- means for adjusting web tension pressure in relation to the measured ambient pressure and in response to an output from the means for measuring web tension pressure.
Dependencies are inferred from the claim text.