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Abstract:	Baumrinde ist ein natürlich hoch optimiertes Material, das als periphere Grenzschicht eines Baumes diesen vor mannigfaltigen Beschädigungen schützt. Daher weist Baumrinde interessante technologische Eigenschaften wie eine geringe Dichte und gute biologische Beständigkeit auf. In der Holzindustrie fallen große Mengen von Baumrinde in Stückform an, welche nur in geringem Ausmaß stofflich höherwertig veredelt werden. Im Rahmen dieser Untersuchung wurden Dämmplatten aus Lärchenrinde erzeugt und deren innere Struktur mittels Computertomographie untersucht. Der Schallabsorptionskoeffizient von Platten unterschiedlichen Aufbaus wurde mittels Impedanzmessung bestimmt und es wurden die Struktur-Eigenschaftsbeziehungen untersucht. Es zeigte sich, dass Lärchenrindenplatten als Absorber für Frequenzen über 500 Hz gute Eigenschaften aufweisen und, dass über die Partikelgröße die Frequenz des Schallabsorptionsmaximums beeinflusst werden kann. Potential of tree bark for the application as sound absorbing material Tree bark is a highly optimized natural material, which protects a tree from manifold damage at the peripheral layer. Hence, bark has some interesting technological properties, such as a low density and a good biological durability. In the wood-industry, huge amounts of bark in pieces accrue, which are used to a low extend for high-value applications. In this investigation, insulation panels from larch bark were produced and their inner structure was evaluated by means of CT. The sound absorption coefficient of panels with varying composition was investigated using impedance measurement and structure-property relationships were evaluated. It was found that larch insulation panels can be applied as effective sound absorbers for frequencies higher than 500 Hz and that the frequency with the highest sound absorption can be affected changing the particle size of the panels.
Source:	Bauphysik 42 (2020), No. 3
Page/s:	124-130
Language of Publication:	German

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