| 摘要 |
A pattern is formed in rapid and continuous manner on aluminized polymer film by printing the aluminum surface with a sodium hydroxide-resistant material, which may be pigmented, contacting the non-overprinted areas of the aluminum with hot aqueous sodium hydroxide solution to dissolve the aluminum rapidly from the base polymeric film and leave unaffected the overprinted areas, and washing the spent sodium hydroxide solution from the film. The steps are carried on a continuous web of aluminized film and result in pattern of opaque areas and transparent areas, corresponding to the overprinted and non-overprinted areas of the film.
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