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Tool life observed during milling as the indicator of MDF machinability. The tool life in the wood industry is very different, depending on the cutting material and therefore tool life is one of the most important criteria for assessing the machinability. In the article this aspect of MDF machinability was tested and characterized. The results of experiments can be used in future for the comparing other materials to MDF in terms of machinability.
The study investigated the extent to which the properties of MDF boards change with changes in the moisture of fibers forming mats from 4.5 to 10.5%. MDF panels were produced in the laboratory with an assumed density of 660kg/m3 and a thickness of 12 mm. It has been found that it is possible to produce boards without their delamination in the whole range of humidity of fibers. The increased amount of water vapor in the mats when they are pressed is likely to influence better plasticization of the fibers, which translates to improved properties of the boards. Increasing moisture content from 6.5 to 10.5% increases the modulus of rupture by approx. 9%, the modulus of elasticity by approx. 7%, intemal bonds by approx.30% and reduces swelling by approx. 22%.
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Mode vibrations of plates - experimental analysis

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Mode vibrations of plates - experimental analyses. In this paper results of the square MDF piate and circular saw blades examination with the use of the harmonic method to static identification of resonant frequencics and shapes of mode vibrations are presented. Obtained results reveled that for circular saws with large holes in a saw blade appeared two resonant frequencies for the same nodal number.
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Possibility of the production of three-layer MDF

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The paper proposes the production of a three-layer MDF instead one layer boards. Three-layer panels have been made from fibers of varying dimensions for the outer and the core layers. The outer layers were produced from standard fibers, while the core layer from longer and thicker fibers (of lower pulp freeness). In order to determine the optimal technological parameters in the production of three layer boards, the experimental plan was used in the study. Three factors at two levels were tested. Analysis of variance (ANOVA) was used to analyze the significance of factors. Regression coefficients and 3D contour plots were used to quantify the relationship between panel properties and test factors. Properties of obtained boards were tested according to the standard EN 622-5/2010. All selected factors within the examined range of settings had influence on MDF properties. It has been found that the best properties of the plates were 25x50x25 involving layers, the content of the glue in the outer layers of 10% and the core layer of 12% at the time of overheating of the mats 90s.
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