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On-line monitoring of hygroscopicity and dimensional changes of wood during thermal modification by means of neutron imaging methods

Sonderegger, Walter ; Mannes, David ; Kaestner, Anders ; Hovind, Jan ; Lehmann, Eberhard

In: Holzforschung, 2015, vol. 69, no. 1, p. 87-95

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    Titel
    • On-line monitoring of hygroscopicity and dimensional changes of wood during thermal modification by means of neutron imaging methods
    Autor
    • Sonderegger, Walter. Neutron Imaging and Activation Group, Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
    • Mannes, David. Neutron Imaging and Activation Group, Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
    • Kaestner, Anders. Neutron Imaging and Activation Group, Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
    • Hovind, Jan. Neutron Imaging and Activation Group, Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
    • Lehmann, Eberhard. Neutron Imaging and Activation Group, Spallation Neutron Source Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Holzforschung, 2015, vol. 69, no. 1, p. 87-95. De Gruyter
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:326385
    Summary
    European beech (Fagus sylvatica L.) and Norway spruce [Picea abies (L.) Karst.] have been thermally modified in a combined air-steam atmosphere between 70°C and 150°C and pressures up to 4 bar, and the changes of dimensions and moisture contents (MC) of the samples were studied in-situ by means of neutron imaging (NI). This non-invasive testing method offers unique opportunities. NI is highly sensitive for hydrogen and thus well suited for monitoring the MC changes, although some metals (e.g., Al), indispensable for sample environments under high temperature and pressure, are practically transparent to neutrons. The results show that the modification induced changes of MC and dimensions both in radial and tangential direction can well be determined by NI. Dimensional changes from water saturation to oven-dry state, the sorption isotherms, and the differential swelling were observed. Additionally, the sorption behaviour at 20°C was investigated after thermal modification and colour measurements were carried out before and after the thermal treatment.