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Mykhailo Ohirko

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Proceedings Article | 5 January 2024 Paper

Study of optical indicators of packaging products

Mykhailo Ohirko, Volodymyr Bernatsek, Olena Kotmalova, Jerzy Czubak

Proceedings Volume 12938, 1293812 (2024) https://doi.org/10.1117/12.3012517

KEYWORDS: Printing, Absorbance, Packaging, Image quality, Coating, Densitometry, Optical limiting, 3D modeling, Optics manufacturing, Optical surfaces

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The development of the printing and packaging industry contributes to the emergence of new printing and finishing technologies. To ensure the quality of imprints, it is important to take into account the optical indicators of the substrates, such as colour, whiteness, shade, gloss, light transmission, and opacity. The objects of research were offset and flexographic imprints on paper, cardboard, and corrugated cardboard with different surface structure and composition. As a result, research has confirmed that the coated surfaces of substrates without optical brightener have a whiteness level of 70-76%, and with optical brightener - within 84-98%. Substrates containing wood pulp have a whiteness level of 72-82%. It has been studied that the values of the gloss index are closely related to the micro geometry of the surface - to smoothness. It was found that with an increase in the smoothness level, the imprint surface's gloss indicators also increased. The gloss of the matte coating of the substrate reaches 30%, and the glossy one reaches 75-80%. A study of the opacity index of imprints, which is very important in double-sided printing, was conducted. Studies have confirmed that as the mass of paper increases, its light transmission decreases. A comparison of optical indicators of imprints obtained by different printing technologies was made. A multi-level hierarchical model has been developed, which takes into account factors affecting the optical indicators of offset and flexographic imprints.

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