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Method and apparatus for selectively demetallizing a metallized film

  • US 5,061,837 A
  • Filed: 05/02/1989
  • Issued: 10/29/1991
  • Est. Priority Date: 05/02/1989
  • Status: Expired due to Fees
First Claim
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1. A method of selectively demetallizing a metallized web moving along a web path, comprising the steps of:

  • selectively generating a potential difference between first and second electrodes disposed spaced apart along said web path, said second electrode comprising a roller extending transversely across said path;

    effecting a first electrical contact of relatively large area between said moving web and said first electrode;

    effecting a second electrical contact between said web and said second electrode, said second electrical contact being of an area less than the area of said first electrical contact, producing a high density current to demetallize said web at said second electrical contact; and

    ,controllably varying the magnitude of the potential difference to control the degree of demetallization of said web.

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