Sökning: "Hårdgjord asp"

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  1. 1. Hårdgörning av Asp

    Kandidat-uppsats, Växjö universitet/Institutionen för teknik och design

    Författare :Martin Johansson; [2008]
    Nyckelord :and to provide a basis for development of a commercial product. Practical tests have been conducted to study hardness; springback and density of the compressed wood. In addition; three-layer panels have been developed to test whether it is possible to have a stable construction by varying the thickness of the buttom layer. Differences in acclimatisation time and the moisture contents effect on the springback has aslo been studied. The results show that the hardness of aspen wood after compression is in equal levels with beech and ashes; a low moisture contet provides a low springback; compressed timber have a longer time for acclimatisation and it is possible to fixate the material in the direction across the grain in a three-layer panel construction; To make wood harder it can be densified. This can be achieved by compression; the compressed material tends to return to the original shape when it is exposed to moisture fluxations and if no form of fixation occurs. The fixation can be done mechanically in a three-layer panel construction which reduce movements in the timber. These panels have been found to be unstable and previous attempts have shown deformations in form of cupping. This study aims to evaluate the conditions for using compressed aspen wood; Hårdgjord asp; asp; Populus tremula; treskiktsskivor; radiell komprimering; återfjädring; hårdhet; acklimatisering;

    Sammanfattning : Hårdgörning av trä syftar till att göra materialet hårdare. Detta går att åstadkomma genom komprimering, det komprimerade materialet tenderar dock att återgå mot sin ursprungsform då materialet utsätts för fukt om ingen låsning sker. Låsningen kan ske mekaniskt i en treskiktskonstruktion som motverkar träets fuktrörelser. LÄS MER

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