Regularities Of Stability For Printing Forms Of Offset Printing With Dampening In Short Runs

The complex research for the changes in the properties of the printing plates' printing and gap elements influenced by the printing process short runs was conducted, that allowed to determine the change of printing and gap elements' surface microgeometry, also to determine the change of the oxide layer stability, and to explain the decrease of the ink receptivity coefficient. The mathematical regression equation model of the printing plates' elements' impact onto the imprints' optical density in offset printing was developed, that allows estimating and predicting properties of modern brand of printing plate. Work reveals some new facts about characteristics for printability such as influences of printing plate's elements parameters' on color characteristics of imprints. Dampening solution, printing plates application and printing settings as well as color features of the imprints are analyzed in the context of offset printing

Печатные свойства офсетных форм

Проведено дослідження впливу процесу друку на друкарсько-технічні властивості елементів друкарської форми монометалевих форм плоского офсетного друку із зволоженням.Was explored impact of the printing process on printing-technical properties of the printing and non-printing elements on the offset printing plates.Проведено исследование влияния процесса печати на печатно-технические свойства элементов печатной формы монометаллических форм плоской офсетной печати с увлажнением

Масс-спектрометрический анализ пробельных элементов печатных форм плоской офсетной печати

Проведено дослідження впливу процесу друкування на зміну складників гідрофільної плівки проміжного елементу монометалевих форм плоского офсетного друку зі зволоженням.Was explored impact of the printing process on change of components of hydrophilic film of the non-printing elements on the offset printing plates. The influence of printing contact to replace components hydrophilic film non-printing elements of monometallic offset printing plates with moisture. Was explored the character of processes losing elements of their properties during the printing process, which is characterized by a gradual decrease in the number hydrophilic substances oxide film on the non-printing elements in physico-chemical and physico-mechanical impact printing environment. Determined the necessity for experimental research to create the optimum operating conditions and environment printing contact, allowing maximum identity imprints during print run.Проведено исследование влияния процесса печати на смену составляющих гидрофильной пленки пробельного элемента монометаллических форм плоской офсетной печати с увлажнением

Resistance of thermo-hygro-mechanically (THM) densified wood to degradation by white rot fungi

Colonisation and degradation by the white rot fungi, Trametes versicolor and T. pubescens, were studied in wood of Norway spruce and beech subjected to three different treatments: (1) hygro-thermal treatment (160°C and 180°C), (2) mechanical densification, and (3) thermo-hygro-mechanical (THM) treatment including densification and post-treatment at different temperatures (140°C, 160°C and 180°C). The weight losses induced by the fungi were lowest in THM-densified woods. However, volume related numerical indicators for decay susceptibility did not show any significant improvements of THM-densified woods against both fungi. Analysis of the chemical composition of treated wood species revealed slight alterations in the content of polysaccharides and lignin. White rot fungi circumvented conditions restricting hyphal growth within the occluded tracheid lumina by hyphal tunnelling in the secondary walls of fibre tracheids in beech or by forming bore holes that transversally penetrated cell walls of earlywood tracheids in THM-densified spruce. The studies indicate that THM-densified beech and Norway spruce wood may have some potential in utility class 3 but are inappropriate for use in utility class