FIELD: printing industry.
SUBSTANCE: proposed invention is designed for protection against counterfeit of packages and other items. Cryptography on the colourless transparent polymer film with the possibility of multiple positive-negative reading of information by means of application of information symbols onto the film with the help of local thermal impact and observation at different angle or in a clear space. Application of information is carried out through usage as a polymer film of unixially oriented rigid elastic polyolefin film, local thermal impact under pressure with subsequent deformation of elastic stretching along the axis of orientation.
EFFECT: proposed invention simplifies production of invisible images on a carrier with provision of high extent of counterfeit protection.
3 cl, 3 dwg, 4 tbl, 6 ex
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Authors
Dates
2013-10-20—Published
2012-02-27—Filed