The paper presents a model of factors that influence on the quality of relief-dot Braille inscriptions in their intensive use by blind people. It was constructed matrix of depending and distancing by using a directed graph. It allowed establish a hierarchy between studied criteria’s of impact the on durability of relief prints. It was developed a basic structure of digital system of assessment the conformity of Braille symbols to applicable international standards and definition of operational stability.
Галузь цифрового друку продовжує стрімко розвиватися відповідно до чис ленних економічних, технологічних, демографічних, екологічних та поведінкових факторів. Зростання індустрії цифрової поліграфії сприяє обґрунтованим та інноваційним рішенням. Вибір різних видів паперу, доступних на поліграфічному ринку, є ключовим фактором досягнення найвищої якості цифрового друку. Особ ливої уваги заслуговує процес взаємодії тонеру з папером, який безпосередньо пов'я заний із його фізичними властивостями. Від поверхневої структури паперу, йо го складу і будови залежить якість відбитків. Проведено експериментальні дослідження впливу граматури паперу на якість тоновідтворення відбитків цифрового друку. Здійснено порівняння кривих гра да цій зображень, отриманих на паперах різної товщини за зміни швидкості дру ку вання одного відбитку та всього накладу. Ключові слова: цифровий друк, граматура паперу, відбиток, градаційна пе ре да ча, оптична щільність, якість.
In order to improve the integration of blind people into society, suitable conditions should be provided for them. The expansion of Braille (BR) use could serve the purpose. Depending on the materials used for Braille, it can be formed or printed in different ways: embossing, screen printing, thermoforming, digital printing. Thus the aim of the presented paper is to determine the influence of thermal effects of screen printing inks and inks with thermo-powder on the BR inks mass change. Screen printing inks and inks with thermo-powder were chosen for the research. Carrying out the qualitative analysis of printouts with Braille, the thermal stability was evaluated by analyzing the thermograms obtained with derivatograph Q-1500. This paper presents the findings of the thermogravimetric (TG), differential thermogravimetric (DTG) and differential thermal analysis (DTA) of printouts printed on paperboard Plike and using traditional screen printing inks and screen printing inks with thermo-powder. Based on the testing findings it is determined that thermal stability of printouts printed with thermo-powder ink is higher than printed with screen printing inks. It is determined that the appropriate drying temperature range of screen printing inks with thermo-powder is 98 ºC-198 ºC because in this case better relief of Braille dots is obtained.
INVESTIGATION OF QUALITY OF PACKAGING MADE OF LAMINATED MICRO-CORRUGATED CARDBOARD The reproductive and graphic indicators of liners printed by offset printing are investigated in this work. It was considered the process of their laminating to micro-corrugated cardboard using the adhesive device of a new construction with the further determination of the operational parameters of the packaging material. As a result of the research, graphic dependencies were constructed that allow us to assess the quality reproduction of a color image in the offset printing and the operational stability of laminated micro-corrugated cardboard.
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