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It was investigated the influence of mechanical factors on the restructuring of micro-corrugated cardboard based on physical models. We considered typical cases of stress-strain state of micro corrugated cardboard during laminating, particularly when micro-corrugated cardboard, as a resilient layer of a certain thickness, compressed by efforts of two rigid cylinder of the same radius. Deformation of micro corrugated cardboard associated with the change of bandwidth of adhesive layer. It was established that when the corrugated wave has a initial sinusoidal shape, the contact bandwidth increases with contact pressure increasing and, consequently, the surface deflection, due to bending deformation of wave corrugated form and limited to loss of elastic properties at extreme deflection. Elastic deformation (compression) of trapezoidal wave corrugated form does not changing the width of the contact zone, as connected only with the phenomenon of its side faces loss stability. It was established that the ratio of radiuses and maximum of wave corrugated deflection are major factors that influence on the deformation of micro-corrugated cardboard during lamination in longitudinal and transverse direction. [ABSTRACT FROM AUTHOR]

In this study was analyzed the physicalmechanical properties and characteristics of different type of threads (polyamide, cotton) for blocks sewing. Investigated the brochure block binding with reduced threads surface friction coefficient, physicalmechanical parameters analysis. An important step in calculating the strength of threads for book sections and book blocks sewing is the choice of the strength criterion. For this purpose, are analyzed the influence of the structure of cotton and polyamide threads antifriction. Here was made the book binding process optimization with different types of the thread. It has been determined that the strongest book binding is with the polyamide type thread. [ABSTRACT FROM AUTHOR]

• Novel method of measuring the uniformity of liquid penetration through fibrous porous materials was proposed. • Texture entropy and contrast were taken into account in the proposed method. • Correlations between the dynamics of liquid penetration and the examined texture parameters were found. • New parameters were introduced for better evaluation of the nature of the liquid flow through the porous material structure. The interaction of liquids with materials is an important factor influencing many technological processes and describing the quality of the material itself. However, characterization of the wetting and penetration of liquids phenomena through the materials of heterogeneous structure is a very difficult task. Paper is an example of such material. Paper sizing is one of the most important operations in paper technology. Its purpose is to reduce the wettability of the paper. The aim of the present study was to evaluate the suitability of the texture analysis to assess the uniformity of liquid penetration through the paper structure in terms of the degree of the paper sizing. As a result of the research, a new method of measuring was proposed based on dynamic changes in their texture parameters. For this purpose, such texture parameters as entropy and contrast were used. Characteristic points were determined on the curves of the dynamic changes of both parameters. It was proved that there is a correlation between the dynamics of liquid penetration through the paper structure and the examined texture parameters. It was found that the maximum value of entropy and contrast, the time of reaching both values, the points of inflection of the curves during their decrease, and the times by which these points were reached can be useful parameters that provide information about the nature of the liquid flow through the porous material structure. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]