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US 5,686,050 AGranted
Method and apparatus for the electrostatic charging of a web or film
AssigneeThe University of Tennessee Research Corporation
InventorsLarry C. Wadsworth, Peter Ping-yi Tsai
Life of this patent
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Abstract
A web or film is electrostatically charged by sequentially subjecting the web or film to a series of electric fields such that adjacent electric fields have substantially opposite polarities. Both a method and apparatus are disclosed for charging the web or film.
Claims83
An apparatus for electrostatically charging a web or film, comprising:
- means for generating a dispersed non-arcing electric field between an electrode means having an electrically conductive curved surface and a single conductive element spaced from the curved surface;
- and
- means for passing the web or film between the electrode means and the conductive element, for subjecting the web to the dispersed non-arcing electric field between the curved surface and the conductive element.
An apparatus for electrostatically charging a web or film, comprising:
- means for generating plural dispersed non-arcing electric fields between plural electrode means, each having an electrically conductive curved surface, and a corresponding number of single conductive elements spaced from the curved surface of the corresponding electrode means;
- and
- means for passing the web or film between the plural electrode means and the corresponding conductive elements, for subjecting the web or film to the plural dispersed non-arcing electric fields between the plural electrode means and the corresponding conductive elements, including means for exposing a first side of the web or film to a first polarity charge upon passage between a first electrode means and a first corresponding conductive element, and to a second, opposite polarity charge upon passage between a second electrode means and a second corresponding conductive element, and means for exposing a second side of the web or film opposite the first side to the second polarity charge upon passage between the first electrode means and the first corresponding conductive element, and to the first polarity charge upon passage between the second electrode means and the second corresponding conductive element.
A method for electrostatically charging a web or film, comprising the steps of:
- generating plural dispersed non-arcing electric fields between plural electrode means, each having an electrically conductive curved surface, and a corresponding number of single conductive elements spaced from the curved surface of the corresponding electrode means;
- passing the web or film between the plural electrode means and the corresponding conductive elements, subjecting the web or film to the plural dispersed non-arcing electric fields between the plural electrode means and the corresponding conductive elements;
- exposing a first side of the web or film to a first polarity charge upon passage between a first electrode means and a first corresponding conductive element, and to a second, opposite polarity charge upon passage between a second electrode means and a second corresponding conductive element;
- and
- exposing a second side of the web or film opposite the first side to the second polarity charge upon passage between the first electrode means and the first corresponding conductive element, and to the first polarity charge upon passage between the second electrode means and the second corresponding conductive element.
2 more elements
Dependencies are inferred from the claim text.