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Screw holding ability of the lignin-bonded biocomposites. Biocomposites derived from the unmodified and enzymatically modified lignin, hemp shives and shellac were manufactured in injection moulding process. The boards were characterized by hardness and screw holding ability. It was found that screw holding ability of the tested boards was comparable to those for particleboard and MDF. Moreover, addition...
Basidiomycetes growing on sleepers reused in small garden architecture. Paper describes results of five-year observations of Basidiomycetes growing on sleepers reused to build garden architecture. Apart from fruit bodies of fungi with already known for capabilities of decomposing creosote-protected wood, some species have been found, not described in the literature so far.
Application of artificial intelligence in the wood industry. Computer performance is to carry out the tasks arising from the algorithm. Artificial Intelligence is to create a machine that mimics human thinking. The study characterizes the various systems of artificial intelligence and their application in the woodworking industry.
Resistance of lime wood (Tilia sp) impregnated with Paraloid B-72 resin against cellar fungus Coniophora puteana (Schum., Fr.) Karst. Work deals with resistance of Paraloid B-72 synthetic resin impregnated lime wood against cellar fungus Coniophora puteana. Resin solutions of 5, 10 and 20% concentrations were used. In laboratory conditions, impregnated samples were exposed to fungus for 16 weeks....
Possibilities of single-stage pressing of veneered particleboards. Following work describes possibility of single-stage pressing of veneered particleboards. Three variants of the 16mm thick boards of 620kg/m3 density were manufactured for the test: (1) single-layer particleboard, (2) single-layer double-stage pressed veneered particleboard (3) single layer single-stage pressed veneered particleboard...
The paper presents some results and discussions regarding the influence of forces and torques on the wood drilling in radial, longitudinal and tangential section on surfaces qualities obtained using helical drills with diameter 10 mm. Surface quality was analyzed in two ways: the appearance of the surface hole (entry and exit of the drill from the workpiece) and processed surface roughness.
Optymalizacja badań mebli. Celem pracy była optymalizacja polegająca na skróceniu czasu i redukcji kosztów badań typowych krzeseł. Przedmiotem badań były połączenia o złączach czopowych. Wysokie współczynniki korelacji wskazują na silną zależność pomiędzy wynikami statycznych i dynamicznych badań próbek. Wskazuje to na możliwość ograniczenia kosztów badań, poprzez zastąpienie badań dynamicznych testami...
Flammability of plywood made from veneers protected with flame retardant based on diammonium hydrogen phosphate, citric acid and sodium benzoate. In this study the impact of pine and beech veneer protection with flame retardant based on diammonium hydrogen phosphate, citric acid and sodium benzoate on the flammability of plywood made from them has been determined. Retention of the agent in veneers...
Effects of vacuum drying with infrared heating on some properties of wood . Drying of wood is one of the most important industrial processes in wood manufacturing. Mechanical properties of wood are affected from drying process. Heating method of the drying process is the most effective factor on the properties of end product. The aim of this study was to determine the effect of infrared heating in...
The analysis of selected parameters characterising economic condition of furniture manufacturer – Forte SA. In this paper changes of the major values affecting the economic condition of any enterprise, regardless of the form of business and type of activity were analysed on the example of Forte SA – a representative of furniture industry. This values analysis can provide many useful data, namely facilitate...
Bonding quality of veneers protected with fireproofing preservation based on diammonium hydrogen phosphate, citric acid and sodium benzoate. In the study, joints strength in three-layer plywood glued with ureaformaldehyde resin, made from pine and beech veneers impregnated with fireproofing preservation based on diammonium hydrogen phosphate ammonium phosphate, citric acid and sodium benzoate, was...
Modeling of joint substitutive rigidity of board elements. The study presents alternative methods of numerical modeling of dowel joint rigidity of board elements using for this purpose nodes of substitute linear elasticity modulus. Values of joint deflections obtained by way of laboratory experiments and numerical calculations differed by 3 to 4%.
The analysis of selected parameters characterising economic condition of Grajewo SA. In this paper changes of the major values affecting the economic condition of any enterprise, regardless of the form of business and type of activity were analysed on the example of Grajewo SA - a representative of wood industry. This values analysis can provide many useful data, namely facilitate the decision of...
The strength of mortise and tenon joints depends on a variety of factors. In this study, we examined the influence of the delay of the joints assembly, from the machining time of the mortise and the tenon, for months 1, 3 and 12, to the tension strength of the T-type mortise and tenon joints. We proved that the increase of assembly delay contributes to the decrease of the tension strength of the joints...
Characteristics of selected fireproof properties of particleboard made from particles impregnated with salt agent. This paper presents results of selected fireproof properties of three-layer particleboard made from pine particles impregnated with open for general use bio- and salt fireproof agent for wood protection, based on quaternary ammonium compounds and boric acid. It leads to conclusion that...
The Impact of Wood Staining with Specific Synthetic Dyes on Pine Wood Gluability. For the purpose of the paper tests were carried out to determine the shear strength of polyvinyl acetate and polyurethane adhesive-bonded joints in pine wood stained with varied kinds of synthetic dyes used to colour wood or impregnates designed to protect wood. The shear strength of adhesive-bonded joints in stained...
„Plants as an alternative source of energy”. W pracy przedstawiono możliwości przetworzenia surowców roślinnych na nośniki energii a także zalety i wady wpływające na produkcję tej energii. Omówiono korzyści jak również straty wynikające z uprawiania roślin energetycznych oraz potencjał ich wykorzystania w przemyśle energetycznym.
Local concentration of stresses as a result of the notch in different positions to the bottom surface of bending solid timber beam based on numerical analysis in Solidworks Simulation environment. The study investigated the phenomenon of local concentration of stresses in the bent timber beams weakened by the opening. Weakness in the timber simulate knotholes or decayed knots. It was found that the...
The paper presents a model of an auxetic push spring to be used in mattresses and seats of upholstered furniture. Grid models were subjected to numerical calculations assuming that springs are manufactured from silicone with the Shore hardness of 70o±5o, and design load of 4 kPa. On the basis of calculations it was shown that the structure has a strongly negative Poisson’s ratio of -0.41 and that...
Influence of the length of CFRP tape reinforcement adhered to the bottom part of the bent element on the distribution of normal stresses and on the elastic curve. The paper analyses the influence of reinforcements made of CFRP tape on the distribution of normal stresses and on the elastic curve of a wooden beam that is being bent. It was a numerical analysis made in the Solidworks Simulation environment...
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