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

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

1982-07-01

1984-08-21

Welsh, John D.

Radiant energy

Luminophor irradiation

Methods

25230135, 25230121, 428913, 428500, 428543, 428195, 118668, 118712, 283 62, G01N 2138

Patent

active

044672071

ABSTRACT:
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 manufacture 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 electromagnetic wavelength-shifted radiation in response to incident electromagnetic radiation of a selected wavelength.

REFERENCES:
patent: 2983686 (1961-05-01), Konig
patent: 3115417 (1963-12-01), Christensen
patent: 3177153 (1965-04-01), Pommer et al.
patent: 3671451 (1972-06-01), Butterfield
patent: 3776761 (1973-12-01), Kato et al.
patent: 3892972 (1975-07-01), Cevasco
patent: 4009551 (1977-03-01), Greenawalt et al.
Frados, Plastics Engineering Handbook, pp. 843-845, Van Nostrand, (1976).
Modern Plastics Encyclopedia, pp. 672-679, 446-447.

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