FIELD: technological processes.
SUBSTANCE: invention is related to devices for impression of flat materials. Device for impression of packing foil comprises at least two rollers for impression, besides one roller is connected to drive. Rollers are put in motion together and are adjusted to elastically press each other. Pyramidal or conical teeth of rollers have cut tops. Teeth (T2) at least of one roller have other geometric shape and/or surface, compared to other teeth (T1). At the same time other teeth (T2) produce impression letters (L) in according areas of passing packing foil, and their surface provides for variation of these symbols appearance depending on angle of observance (O) and/or type and /or position of light source (LS). Metallised and/or reflecting packing foil, produced with the help of mentioned device, has letter (L), intensity of which varies depending on angle of observance (O) and/or type and/or position of light source (LS).
EFFECT: invention makes it possible to impress flat material with letters, including optical effects, which depend on position of observer and/or light source, which makes it possible to also create such protection elements that are difficult to counterfeit.
7 dwg
