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HISTORYASIA - MANKIND - THE PRINTING PRESS

UV-curable printing inks and varnishes play an important role in printing technology since they allow high printing speeds printin fast further processing and provide an excellent optical appearance [1]. Therefore, package printing is one of their main application areas, where they are particularly used for high-quality goods such as cosmetics. Most UV-curable printing inks and lacquers are based on acrylate formulations, which cure in a radical reaction. The processing and application properties of printed layers such as scratch or wipe read more, migration behavior, blocking, surface appearance, and other importance of the printing press do not only depend on the composition of the ink or varnish formulation, but also substantially on the level of the final conversion, which is achieved during UV curing.

importance of the printing press

The conversion is influenced by various physico-chemical and technical factors. The most important one is the irradiation dose, which is applied to the printed layers and which depends on both the irradiance and the printing speed. Moreover, ambient conditions such as temperature and inertization can influence the final conversion. Most of these parameters can be easily controlled in order to ensure a sufficient level of conversion.

importance of the printing press

However, some other influencing factors are hardly to control, for importanc the different absorption of inks with different colors or the pollution and aging of the UV lamps, which can strongly decrease their emittance and consequently affect the con-version in the inks reached during UV irradiation.

In order to meet the increasing quality requirements, it is therefore essential to control the conversion continuously and directly in the printing process.

The Importance Of The Printing Press

One importance of the printing press the most common analytical methods used for process control is near-infrared NIR spectroscopy [], which has found numerous applications in agriculture, food manufacturing, chemistry, pharmaceutics, and many others. The investigation of thin polymer coatings is still a rather new area, which is probably due to the challenging analytic requirements with respect to sensitivity. In the past, we reported on investigations on the conversion [] and the thickness [] of UV-cured acrylate coatings by NIR spectroscopy. A broad range of different substrates and coating materials as well as the influence of various ambient and technical parameters on the precision of the measurements were studied. Moreover, it was also shown that both parameters can be determined simultaneously [13].

importance of the printing press

In case of printed layers, the thickness is lower than that of coatings by about one order of magnitude. Consequently, the requirements to the sensitivity of the analytical equipment are even higher. Nevertheless, it was demonstrated that the coating weight of thin printed layers which is used in instead of the thickness in printing technology can be determined with high precision by this method []. The error of the prediction of the coating weight of printed varnish layers measured in an offset press was article source 0. The objective of the present work consisted in the development of methods for the in-line measurement of the conversion in UV-cured printed layers.

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This also included the development of a new small probe head for NIR spectroscopy because the available space in the delivery unit of the offset printing press was very limited and several other restrictions had to be considered. Therefore, the probe head developed previously for the determination of the coating weights of printed layers, which was carried out at another, more easily accessible position of the press, could not be used in the present study. Scherzer 11 pages. Back to full article list.]

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