Non-migrating control indicia for a plastic web or sheet...

Details Non-migrating control indicia for a plastic web or sheet... Non-migrating control indicia for a plastic web or sheet...

B - Operations, Transporting

32

B

117/17, 340/124.

B32B 3/10 (2006.01)

Patent

CA 1186183

-19- . ELECIROMAGNETIC-WAVELENGTH-SHIFTING CONTROL INDICIA FOR A PLASTIC WEB OR SHEET ARTICLE Abstract of the Disclosure An article in web or sheet form, especially useful in the packaging or container art, having control indicia. The indicia are detectable under special conditions for controlling operations in the manufac- ture and/or use of the article. In the preferred embodiment the indicia are invisible and of a polar or ionic organic material that will not significantly migrate through a plastic web. The indicia emit electro- magnetic wavelength-shifted radiation in response to incident electromagnetic radiation of a selected wave- length .

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