Demetallizing procedure

Details Demetallizing procedure Demetallizing procedure

B - Operations, Transporting

44

C

B44C 1/22 (2006.01) B32B 7/12 (2006.01) B32B 15/08 (2006.01) B65D 81/34 (2006.01) C23F 1/02 (2006.01) C23F 1/36 (2006.01) H05K 1/00 (2006.01) H05K 3/06 (2006.01)

Patent

CA 2041062

Selective demetallization of an etchable metal film supported on a polymeric material or other microwave transparent material, particularly an etchable metal film, particularly aluminum, of thickness at least about 1 micron adhesively joined to a flexible polymeric material substrate, is described. A web of metallized polymeric material has a pattern of etchant-resistant material first applied and then the web is immersed in and passed through a bath of aqueous etchant, particularly hot aqueous sodium hydroxide solution, for a time at least sufficient to completely remove the etchable metal from non-protected areas of the web. The demetallized web is washed and dried.

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