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Method and apparatus for the electrostatic charging of a web or film

  • US 5,401,446 A
  • Filed: 10/09/1992
  • Issued: 03/28/1995
  • Est. Priority Date: 10/09/1992
  • Status: Expired due to Term
First Claim
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1. A method for electrostatically charging a web or film having first and second sides, the method comprising:

  • inducing a positive charge adjacent the first side of said web or film, and a negative charge adjacent the second side of said web or film; and

    inducing a negative charge adjacent the first side of said web or film, and a positive charge adjacent the second side of said web or film;

    and further comprising sequentially inducing a plurality of timesa) a charge adjacent the first side of said web or film, wherein the charge after inducing is substantially opposite the charge adjacent the first side of said web or film immediately prior to inducing, andb) a charge adjacent the second side of said web or film wherein the charge after inducing is substantially opposite the charge adjacent the second side of said web or film immediately prior to inducing.

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