Electronic-microscopic research of offset imprints of bar codes, printed with inks with magnetic properties

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Havenko S. F., Koniukhov O. D. № 1 (58) 20-27 Image Image

The article presents the results of electronic-microscopic research of magnetic properties of printing ink for bar codes printing on printing and packaging products by offset printing technique.

At present, control and access management systems have become quite widespread. One of the key elements of such systems is an identifier. One can refer bar codes to the most common types of identifiers. They are representatives of the oldest methods of automatic identification and they are widely used in practice. This is due to their low cost, and on the other hand, they have got a wide range of functionalities that allow the optimal solution of a wide range of tasks in a wide variety of areas – from postal service to goods marking and databases formation and maintenance. Thus, they are mainly used to identify various items.

The imprints of bar codes printed with inks with magnetic impurities on the offset sheet printing press Heidelberg Sorm Z-74-2 have been selected as the objects of the research. The nano powder of nickel oxide has been used as impurity, which has been mixed with printing inks in certain proportions. The dependency of the coil inductance on the magnetic properties of the core (the material inside the coil) has been used to determine the magnetic penetrability.

As a result of the research, it has been found out that the size of the magnetized particles of trivalent nickel oxide, that is, the length of the particle, the diameter, etc., depending on the predicted shape of the particle, gives greater or lesser properties of the residual magnetic field (residual magnetization). The structure of the printing material surface is really significant for the barcode quality printed with inks with magnetic properties. As the studies have shown, the preferred option is when the packaging ma­terial has a layered structure (cardboard) or a single layer structure, such as in polymer films.

Keywords: electronic-microscopic research, bar code, printing ink, offset printing, magnetic properties.

doi: 10.32403/1998-6912-2019-1-58-20-27

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