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Demetallizing procedure

  • US 5,340,436 A
  • Filed: 01/31/1992
  • Issued: 08/23/1994
  • Est. Priority Date: 02/14/1991
  • Status: Expired due to Term
First Claim
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1. A continuous method of effecting selective demetallization of a layer of aluminum having a thickness of at least about 1 micron supported on a web of flexible polymeric material, which comprises:

  • continuously applying a pattern of sodium hydroxide-resistant material to said aluminum corresponding to a desired pattern of non-etched aluminum,continuously passing said patterned web in an immersed condition through a bath of aqueous sodium hydroxide solution having a temperature of about 10°

    to about 98°

    C. and a strength of about 0.1 to about 1 normal for a time of at least 0.5 secs. per micron thickness of said aluminum layer to effect complete removal of aluminum from areas of the web not covered and protected by said pattern,continuously washing said web free from spent sodium hydroxide solution, anddrying said washed web.

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