Multilayer film for tamper indication by use of optical interfer

Details Multilayer film for tamper indication by use of optical interfer Multilayer film for tamper indication by use of optical interfer

1991-12-23

1992-09-22

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

359359, 359556, 359554, 359587, 359588, 215246, 53442, 206807, 428131, 428156, 428212, 428215, 4284231, 428480, 428913, B65D10100, G02B 110, B32B 700

Patent

active

051495783

ABSTRACT:
A multilayer film including contiguous layers of two or more diverse thermoplastic materials of differing refractive indices whereby the film retains a permanent color change as evidence of tampering or an attempt at tampering when the yield point of at least one of the diverse materials has been at least equalled by the strain associated with such tampering or with such an attempt at tampering, and where before such yield point is at least equalled the wavelength of an unsuppressed reflectance of normally incident light is not within the visible spectrum while after such yielded point is at least equalled the reflectance is retained in the visible spectrum.

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Article "Multilayer Filters with Wide Transmittance Bands" vol. 53, No. 11, Jrnl of Optical Soc. of America.
Article "Reflectivity of Iridescent Coextruded Multilayered Plastic Films" vol. 13, No. 3, Polymer Engineering and Science Article, Tamper Evident Packaging and Food, ASTM Standardization News.
Compilation, "Tamper Evident Packaging--A Literature Review" PIRA Information Services publishing, pp. A85-88.

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