Kiln Climate and Internal Wood Climate during Drying and Heat Treatment of Logs, Planks and Clearwood Samples
2010 (English)In: Recent Advances in the Field of Wood Drying: 11th International IUFRO Wood Drying Conference. pp. 194-199. Skellefteå, Sweden, January 12-22, 2010 / [ed] Tom Morén; Lena Antti; M. Sehlstedt-Persson, Skellefteå, 2010, 194-199 p.Conference paper (Refereed)
Effects of elevated temperatures on wood properties have been reported in numerous studies. Altered properties on microscopic level as well as plank level have been reported. The altered properties are related to physical as well as chemical phenomena. Changes in chemical properties can be expected to be greatly influenced by the internal wood climate. The internal climate will influence speed of chemical reactions and possibly also lead to different processes for a dry specimen as compared to a moist, and for specimens at high temperature as compared to lower temperature. The internal wood climate during drying and heat treatment will be determined by factors like drying climate, moisture content of the wood, material properties, and size of the specimen studied. Evaporation of moisture and moisture flux will influence kiln climate as well as internal wood temperature level and temperature distribution. A small specimen will adapt faster to the surrounding climate than a large specimen. A specific kiln climate will lead to different moisture gradient and internal stresses in a small sample as compared to a full size plank. When resultsfrom small samples are to be compared to results from planks or logs, the correlation between internal climate in small and large samples needs to be considered. The present paper reports results from temperature measurements during drying and heat treatment of logs, planks and small clearwood specimens. The results illustrate the great difference in internal climate between small and large specimens treated in the same external climate. The paper includes principal suggestions on strategies for how to adapt laboratory tests on small samples to industrial treatment of sawn lumber.
Place, publisher, year, edition, pages
Skellefteå, 2010. 194-199 p.
Research subject Wood Technology
IdentifiersURN: urn:nbn:se:ltu:diva-40136Local ID: f221ff47-c180-435e-9da0-303b93c71aabOAI: oai:DiVA.org:ltu-40136DiVA: diva2:1013659
International IUFRO Wood Drying Conference : 18/01/2010 - 22/01/2010
Upprättat; 2010; Bibliografisk uppgift: In thesis: Drying and thermal modification of wood - studies on influence of sample size, batch size, and climate on wood response; 20160524 (jacnas)2016-10-032016-10-032016-12-09Bibliographically approved