Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique
| Autor: | Rudolf Plagge, Frank Meissner, André Wagenführ, Mario Zauer |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
040101 forestry
0106 biological sciences Pore size Pressure plate Distribution (number theory) Chemistry Capillary action 04 agricultural and veterinary sciences 01 natural sciences Equilibrium moisture content Biomaterials ddc:670 010608 biotechnology kapillare Porengrößenverteilung (CPSD) Gleichgewichts-Feuchtigkeitsgehalt (EMC) Fasersättigungspunkt (FSP) hohe relative Luftfeuchtigkeit (RH) Druckplattentechnik (PPT) thermisch modifiziertes Holz 0401 agriculture forestry and fisheries Composite material capillary pore-size distribution (CPSD) equilibrium moisture content (EMC) fiber saturation point (FSP) high relative humidity (RH) pressure plate technique (PPT) thermally modified wood |
| Zdroj: | Holzforschung. 70:137-143 |
| ISSN: | 1437-434X 0018-3830 |
| DOI: | 10.1515/hf-2014-0340 |
| Popis: | This paper deals with the determination of the capillary pore-size distribution (CPSD) and equilibrium moisture content (EMC) of untreated and thermally modified (TM) Norway spruce [Picea abies (L.) Karst.] by means of the pressure plate technique (PPT). Desorption experiments were conducted at very high values of relative humidity (RH) in the range between 99.2% and 100%. The thermal modification of spruce results in an alteration of the CPSD, owing to the formation of intercellular cracks in the middle lamella, as a result of cell-wall compression. The desorption curves for both untreated and TM spruce show an extremely upward bend at 99.97% RH. This step reflects an EMC of 38.1% for untreated spruce and 33.8% for TM spruce. None of the samples shrunk during the PPT measurements. Following desorption experiments at 97.4% RH, all samples shrunk. This step reflects an EMC of 27.9% for untreated spruce and 21.7% for TM spruce. |
| Databáze: | OpenAIRE |
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