ACTIVATION OF THE SURFACE OF POLYMER HEAT-SEALABLE MATERIALS IN CORONA-DISCHARGE PLASMA TO ENHANCE ADHESION PROPERTIES AND PRINT QUALITY
Abstract
The article presents materials on methods for activating the surface of polymers in order to increase their surface energy and adhesion, which leads to a significant improvement in the quality of the printed image. The corona-discharge treatment method is the most widely used in industry and consists in bombarding the polymer surface with free atoms, radicals, and electrons, which results in the cleavage of covalent bonds and the scission of polymer macromolecular chains with the formation of numerous open bonds as well as free valencies. It has been established that printable polymer films (polyethylene, polypropylene) treated with corona discharge at voltages of 10 and 12 kV acquire sufficient hydrophilic properties and exhibit a substantial increase in wettability, thereby predetermining high print quality with uniform distribution of the ink layer on the print.
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