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Vliv modifikace bukového dřeva na parametry obrábění
Vencl, Jakub
The Bachelor´s thesis is focused on the observation of effect of beech wood modification on the energy parameters of chip machining. It is about a comparison of modifications of beech, i.e. Lignamon and Bendywood which will be compared to native beech. In the case of native wood, the results of experimental measurements were also compared to results calculated with conventional methods. The methods which were used were: Technological-statistical and Analytical method. The primary investigation was cutting force. It was found that modification of beech wood does not have a statistically significant effect on machining parameters. In a comparison of two theoretical methods in the case of native wood was found that the Technological-statistical method had better sameness with experiment. The disadvantege of those methods is that they cannot be used for modified wood.
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Vliv jednotlivých fázi výrobního procesu Lignamonu a jejich vzájemných interakcí na výslednou odolnost vůči dřevokazným houbám
Nevrlý, Ondřej
In this work is discussed about material Lignamon, which has been industrially produced in the former Czechoslovakia since the 1970s. The production of this material, mainly from beechwood, combines plasticization with gaseous ammonia, densification of material by hydraulic press and heat stabilization at 180 ° C. The aim of this work is to determine the effect of these processes on the resulting resistance to wood-decaying fungi. Lignamon has a very high resistance to wood-decaying fungi and is classified as very durable according to EN 350 - 1. For each phase of the Lignamon process, samples were produced to best illustrate the changes that take place during the given phase in the wood. In particular, sample sets treated with ammonia gas, densified samples, heat-treated samples, and samples on which a combination of ammonia gas impregnation and thermal modification were performed. The resistance to wood-decaying fungi have been tested according to EN 113, including a set of Lignamon samples. The results of this test were statistically evaluated and it was found that ammonia treatment has the greatest influence on the durability of Lignamon, as well as the heat treatment and not so significantly densification. Individually, however, none of these modifications cause wood resistance to wood-decaying fungi as their combination in the production process of Lignamon.
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