Abstract
The rapid development of digital printing and the popularity of corrugated packaging production encourages manufacturers to improve product quality. Therefore, research into the quality of digital prints, using modern procedures for determining the qualimetric indicators, is important for both consumers and manufacturers. We have studied the prints made by the inkjet printing machine Durst Rho 1312. The printing involved the inks CMYK+Light Cyan+Light Magenta (Austria)+Light Cyan+Light Magenta. The prints were obtained directly on five-layer corrugated cardboard using the post-print technology. In addition, the printing was performed on a liner, followed by its pinning to fluting (the preprint technology). The paper describes a procedure for determining the qualimetric prints’ indicators, in particular, optical density, the increase in the tonality of the raster image, color reproduction, resolution, print stability on prints, and in the printing process, and lightfastness. The imprints’ quality was evaluated in accordance with the requirements set by the standard ISO/TS15311-2:2018. The quality of digital and offset prints has been compared. It has been established that the digital post-print technology on the five-layer corrugated cardboard BE and the pre-print technology on the cardboard GD180 ensure the same print quality parameters. This includes such a quality indicator as the reproduction of raster image tones, optical density, color difference, printing stability. The print resolution of the imprints has slight deviations. It was found that the color transfer of offset prints is higher (by 10 %) than that of the digital prints based on the pre-print technology. Offset printing also provides higher resolution (by 93 lines/cm) than digital printing. However, in terms of print stability and color difference, the inkjet prints are inferior to the offset technology. Digital prints have good lightfastness (10‒20 times better than offset samples)
Highlights
Requirements for the design of printed packaging are constantly growing
The variety of digital printing machines and materials requires that consumers should analyze carefully the quality of printed products
The market of digital printing on corrugated cardboard can be divided into two major segments: pre-print and post-print
Summary
Requirements for the design of printed packaging are constantly growing. Packaging is becoming more attractive while the requirements for reproducing multi-color images are constantly increasing. The modern market offers a wide range of different packaging materials but priority by both producers and consumers is given to environmentally friendly materials Its capability to be printed on largely depends on the properties of the papers used to produce it As it is known, important elements of corrugated cardboard are fluting and liner. The surface structure of the liner, its roughness, and smoothness determine the printing properties of corrugated cardboard It is the presence of the coated surface or its absence on the liner surface determines the quality level of the printed image [2]. The variety of digital printing machines and materials requires that consumers should analyze carefully the quality of printed products. It is important to study the quality of inkjet prints, the testing of packaging materials, taking into consideration the technological processes of printing
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