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Effect of climatic conditions on dimensional stability ofpaper products. The influence of temperature and air humidity on utilitarian features of paper products has been known by manufacturers and users of these products for ages. That it why the estimate and composition of its features are conducted after the process of paper's conditioning. In practice, as far as industry and goods turnover are...
The stress analysis of a rebate joint in case construction was presented in the paper. The finite element method was used to determine the distributions of the stresses of selected places of the joint. The investigation into the effect of the size of the joint on the maximal values of these stresses was made.
Wood plastics composites (WPC) based on wood filler and thermoplastic matrix have been produced in smaller quantities for several decades in the United States (woodstock, etc.) as well as in the Europe periodically. Extensive research programs in several countries some 15 years ago, gave impact to WPC technology which was developed quickly, and many manufactures have begun to produce WPCs at the beginning...
The influence of the thermal aging upon the properties of PVC foils pressed on furniture elements. Part HI. Resistance to steam action and high temperature. Determined resistance of steam action and high temperature of the surface of furniture elements finished with new generation PVC foils, vs. the number of cycles of aging tests. The following tests for finished surfaces were executed: steam action...
На основании проведённых экспериментов установлено, что модификация нитроцеллюлозо-целлюлозных контейнеров при помощи погружения в растворитель приводит к очень значительному уменьшению скорости проникновения водяного пара через стенки контейнера. Самые хорошие результаты WVTR были получены для «чистых» растворителей; для ацетона 21,68 г/м2*24 ч, для тетрагидрофурана 27,64 г/м2*24 ч. Другие 5 % растворы...
Stresses and strains analysis in elastic states of very slender column with square cross section compressed by balls. The problems of determining the stresses and strains in an axially compressed column with square cross section are presented in the paper. The problems are considered in the paper under conditions of the flat cross-sections and little slopes of the elastic line. The received theoretical...
The economic standing of stock-listed companies is determined by numerous factors. The economic standing is most frequently discussed against their sales receipts or net profit. Other indicators, and market indicators in particular, also proved useful as they bring important information to stock investors. The assessment of economic standing for stock-listed wood industry companies and for representatives...
Chosen issues in the use of polyurethane glue for gluing elements of wooden structures using particleboards.ln this paper are presented the results of studies of the shearing strength with compression of samples made from OSB boards glued with polyurethane glue.
Portable computer measurement diagnosis system of machine tools in wood industry. In this paper the diagnosis system for the assessment of any machine tool in the wood industry, on the base of such mechanical measured quantities as rotational speed, a spindle or a tool relative vibrations, bearing housing absolute vibrations, static and dynamic axial or radial displacements, is described. The use...
Timber price is shaped by the market depending on the market situation phase. Customer are only willing to pay such prices that provide them with a satisfactory profitability, the method proposed below allows assessing ram material from the w/timber processing plant's point of view. Different customers accept different prices. To the customers, the price is a timber value to be accepted or not depending...
The decision to increase the share of logs in softwood appropriated for saw mills may be taken only after introduction of changes to turnover in that raw product. The issue calls of interdisciplinary preparations embracing identification of measurement principles, total tree volume calculation and timber quality.
Properties of OSB/3 and OSB/4 boards depending on cyclic changes in humidity and air temperature. The effect of cyclically changing humidity at the temperatures of 20°C and 35°C on physical and mechanical properties of OSB/3 and OSB/4 boards with various thicknesses was investigated in this study. The investigations showed that cyclic changes in air humidity, irrespective of temperature, did not cause...
Es wurde der Einfluss der Abmessungen und der Formen der Proben auf die Bewertungsmöglichkeit der Wirksamkeit des Holzschutzes in den Freilandversuchen mit Bodenkontakt analisiert. Es wurden die Faktoren, die wesentlich auf die Holzzersetzungsschnelligkeit und die Ergebnisse der Festigkeitsuntersuchungen beeinflussen, erörtert. Es wurde die Projektmöglichkeit der verkleinerten Versuchsproben festgestellt,...
Analyses of static displacements of a spindle applied in typical ciradar sawing machines. In this work static properties of a spindle applied in typical circular sawing machines were analysed. The conventional axis of rotation of the circular sawing machine spindle was defined. In computations of both fore end displacements and a spindle stiffness coefficient the effect of cutting forces and driving...
The development of modern cabinet furniture forms. Part II, XVII - XVIII centuries. This study describes changes in the cabinet furniture forms in the period of XVIIth - XVIIIth centuries.
The thickness of glue lines in 3-layer beech plywood was investigated. The plywood was manufactured in a laboratory using the phenol- formaldehyde and urea-formaldehyde resin. The thickness of the real glue lines between surfaces of adjacent veneers was measured using microscopy, and the thickness of the apparent glue lines including the real glue lines and the glue which penetrated into the wood...
The paper presents investigations of the influence of the metal catalysts (Cu, Cr, Cd, and Mo) on the efficiency of the two-stage hydrogen peroxide brightening of spruce CTMP under acidic and alkaline conditions. The presence of the catalysts limits the peroxide consumption and slightly improves the brightness of the pulp as compared to the standard one-stage alkaline processing.
On a démontré le rapport entre les indices technologiques choisis et 1'état d'usure de l'outil. On été étudiés les indices suivant: la surface d'arrachements du stratifié (pour le panneau stratifié), l'hauteur moyenne des bavures (pour les panneaux MDF) et la rugosité de la surface de l'objet usiné (pour les panneaux MDF). On n'a pas constate, que le changement de vitesse d'avance dans l'intervalle...
Cellulose sample was isolated from pinewood by Kürschner-Hoffer method. Degradation of cellulose in a water suspension was conducted using laboratory homogeniser with rotating knives. The resulting cellulose was analysed by size exclusion chromatography to obtain molar mass. A simple zero-order kinetic model was applied to approximate the experimental data and degradation rate constants were estimated...
The effect of air humidity on the mechanical properties of selected paper products. Paper products belong to the materials that can strongly sorb water from both liquid and gas phase. Chemical properties of cellulose and a structure of cellulose fibres cause that the amount of absorbed water affects significantly paper utility. From the point of view of both producers and consumers it is very important...
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