CRYPTOGRAPHY AND MULTIPLE POSITIVE-NEGATIVE READING OF INFORMATION ON COLOURLESS TRANSPARENT POLYMER FILMS Russian patent published in 2013 - IPC B41M5/00 G11B11/00 

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