Yasinskyi M. Theoretical and applied fundamentals of formation and assessment of wear resistance of photopolymer printing plates

The thesis is devoted to the solution of the actual scientific and applied problem in the development of theoretical and applied fundamentals of formation and assessment of wear resistance of photopolymer printing plates on the basis of modelling and research of the stress-deformed condition of printing surfaces and physical and chemical properties of photopolymerizable composite materials. The analysis of the current condition, perspectives and problems of the technology of manufacturing and operation of photopolymer printing plates has been done, additionally the dependency of the wear resistance of the plates on the stress condition and the deformation of the printing elements has been defined as well as the changes in the physical and mechanical properties of the plate material under stress and the influence of technological environ-ments on the wear of the printing plates. The process of formation of wear-resistant printing elements of letterpress plates has been studied. It has been shown that the profile nature depends on the value of the integral coefficient of weakening the energy flux of a particular isoenergetic circuit, which is visualized at a given exposure. The main reason of the plate destruction is the fatigue strength, which causes cracks in the outer layer of the polymer appearing and spreading to the adhesive, which leads to the plate detachment and causes the loss of printing elements. Keywords: quality, model, optimization, wear resistance, surface energy, viscosity, surface properties, photopolymer printing plate, compression, stress, deformation, flexography, offset printing technique.