| Author(s) | Collection number | Pages | Download abstract | Download full text |
|---|---|---|---|---|
| Kukura Yu. A., Repeta V. B., Kukura V. V. | № 2 (90) | 64-71 |
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Ultraking Xcura (Flint Group) and NewV (Huber Group) UV curing inks for offset printing were used in the experimental work. The additive Ultraking Photoinitiator Paste XLM was used to accelerate the polymerization of the inks, the additives Ultraking Liquid Reducer (ULR) and MGA Paste Reducer (MGA) were used to reduce the stickiness of the inks. The printed samples were obtained using an IGT Testing System laboratory proofing device. A laboratory exposure device was used for photopolymerization of the obtained impressions. The optical density of the test prints was determined using an X-Rite SpectroEye spectrodensitometer. A Brookfield RVT rotational viscometer was used to determine the viscosity of UV inks, and a roller adhesion tester was used to determine their conditional stickiness.
As a result of experimental studies of the properties of UV inks for flat offset printing and prints obtained using these inks, the dependence of the effect of the concentration of the photoinitiating additive Ultraking Photoinitiator Paste XLM on the curing time of UV inks on prints was established. It has been determined that adding 3% photoinitiator to their composition reduces the polymerization time of NewV series inks by 27-30% and Xcura series inks by 25-29%. The dependence of the influence of the concentration of ULR and MGA additives on the conditional tackiness of UV inks has been established, and it has been determined that when using a 3% ULR additive, the conditional stickiness of inks of both series decreases by 35-40%, and when using a 5% MGA additive, it decreases by 45-50%. The dependence of the influence of ULR and MGA additives concentration on the viscosity of UV inks has been established. It was determined that the ULR additive reduces both the stickiness and viscosity of the tested inks, while the MGA additive reduces the stickiness of UV inks without changing their viscosity. The dependence of the influence of the concentration of ULR and MGA additives on the setting time of UV inks on prints has been established. The dependence of the influence of the concentration of the studied additives on the optical density of UV inks on prints was established, and it was determined that their introduction into the composition of UV inks has minor impact on the optical characteristics of prints.
Overall, based on the analysis of the results of experimental studies, the optimal concentrations of corrective additives in Ultraking Xcura and NewV inks have been established.
Keywords: offset printing, UV ink, additive, photoinitiator, viscosity, stickiness, polymerization time, optical density.
doi: 10.32403/0554-4866-2025-2-90-64-71
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