Abstract
This paper investigates the quality of inkjet printing on corrugated cardboard with various characteristics such as the presence of surface coating, the type of cardboard structure, the corrugated layer profile, and the corrugated cardboard height. The color characteristics of the corrugated board surface of studied samples were analyzed in the CIE Lab system; the value of the discrepancy in the shade of white was established when compared with the reference values of the ISO 12647 standard. During the study, the main criteria for assessing the quality of color reproduction of inkjet imprints were analyzed: an indicator of the general contrast level (K), the value of color differences for the basic tone shades (ΔE), and the volume of the body color coverage (ΔE2). It was found that when printing on various types of corrugated cardboard, there is a general decrease in the overall contrast value. The actual level of color differences is ΔE=10...45 and exceeds the permissible standards for the color reproduction quality. This adversely affects the reproduction of different color tones in the printed image. In general, the quality of color reproduction differs for the test samples of corrugated cardboard in terms of the magnitude of the spread in the values of color distortions on the tone shades. The influence of the main characteristics of the investigated samples of corrugated cardboard on the quality indicators of inkjet printing has been analyzed. In particular, a significant influence of the index of color characteristics of the surface of corrugated cardboard L* and the type of corrugated board structure on the quality of color reproduction has been established. The study results reported here could make it possible to reasonably approach the selection of the corrugated board structure that is optimal in composition, increase the productivity of the technological process for manufacturing containers, and stabilize the quality of printing on corrugated cardboard
Highlights
The use of digital printing for the manufacture of printed products continues to grow due to the possibility of printing on various types of materials
It should be noted that the tolerances on the printing quality on various materials according to ISO 12647 [2] are adapted to the standard range of printing paper
We tested the compliance of the optical properties of the corrugated board surface with the existing requirements of the ISO 12647 standard, which determines the tolerances for deviations in color characteristics measured on the corrugated board surface (Fig. 2)
Summary
The use of digital printing for the manufacture of printed products continues to grow due to the possibility of printing on various types of materials. The development of new digital techno logies [1] has allowed using inkjet printing on the surface of a wide range of existing types of corrugated cardboard. The main limitation when using inkjet printing on corrugated cardboard is the low quality of color reproduction on the imprint. This is due to the relatively lower optical and printing-technical surface properties for most types of corrugated cardboard. A comprehensive study of the effect of surface characteristics of different types of corrugated cardboard on the quality of inkjet imprints is an important scientific area. The results to be obtained would make it possible to establish acceptable tolerances on the quality of color reproduction on inkjet imprints for different types of corrugated cardboard. It is especially important to establish the types of corrugated cardboard with stable color reproduction when printing
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