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.
Claims20
A method for prescribing the degree to which a web floats about a web transporting roller, the web having an outgassing pressure, the method comprising the steps of:
- providing a web;
- providing a web transporting roller over which the web travels;
- and
- setting an operational web tension pressure in relation to the web outgassing pressure to achieve the prescribed degree of float.
A method for prescribing the degree to which a web floats about at least one web transporting roller, the web having an outgassing pressure, the method comprising the steps of:
- providing a web;
- providing at least one web transporting roller over which the web travels, the at least one web transporting roller having an average roughness affecting the degree to which the web floats;
- and
- obtaining the prescribed degree of float by selecting a configuration of the at least one web transporting roller based at least in part on the average surface roughness of the at least one web transporting roller.
A method for prescribing the degree to which a web floats about at least one web transporting roller, the web having an outgassing pressure, the method comprising the steps of:
- providing a web;
- providing a web transporting roller over which the web travels;
- and
- setting an operational web tension pressure in relation to the web outgassing pressure;
- and
- selecting a configuration of the at least one web transporting roller based at least in part on an average surface roughness of the at least one web transporting roller to achieve the prescribed degree of float.
Dependencies are inferred from the claim text.