Original scientific paper

https://doi.org/10.5552/drvind.2022.0021

Initial Desorption of Reaction Beech Wood

Jerzy Majka orcid.org/0000-0002-6713-8077 ; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Wood Science and Thermal Techniques, Poznań, Poland
Maciej Sydor orcid.org/0000-0003-0076-3190 ; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Woodworking and Fundamentals of Machine Design, Poznań, Poland
Jakub Prentki ; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Wood Science and Thermal Techniques, Poznań, Poland
Magdalena Zborowska ; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Chemical Wood Technology, Poznań, Poland

Abstract

The research aimed to obtain empirical data for modeling the initial desorption in reaction wood from the cross-section of the green beech (Fagus sylvatica L.) log. Firstly, we analyzed the chemical composition, macro and microscopic structure of tension and opposite wood tissue. Then, the Equilibrium Moisture Content (EMC) was measured by the Dynamic Vapor Sorption method during the initial desorption. The used air parameters were specific for the mild drying schedule of green beech timber (t = 20, 35, and 50 °C, Relative Humidity (RH) ranging from 95 to 0 %). Relationships between the EMC of reaction wood and drying parameters were modeled using the Response Surface Method (RSM). The tests revealed: different hygroscopic properties of tension and opposite wood, the dependence of EMC value on temperature, and differences between EMC values for initial (first) and second desorption. Moreover, it was confirmed that, during initial desorption, the EMCs of reaction wood are significantly higher than reference EMC data. The differences in the EMC value are up to 0.14 kg/kg (for air with RH above 90 %). The presented polynomial model of the initial desorption of reaction beech wood can improve drying schedules for beech sawn timber with a high amount of reaction tissue.

Keywords

equilibrium moisture content; kiln-drying; response surface methodology; Fagus sylvatica L.; sorption isotherms; reaction wood; tension wood; opposite wood

Hrčak ID:

280461

URI

https://hrcak.srce.hr/280461

Publication date:

15.7.2022.

Article data in other languages: croatian

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