Moisture sorption and thickness swelling of wood-based materials intended for structural use in humid conditions and bonded with melamine resin

25th International Conference and Meeting of Departments, CONSTRUMAT 2019

Böhm, M.^1 ; Kobetiová, K.^1 ; Procházka, J.^2 ; erný, R.^1

Czech Technical University in Prague, Faculty of Civil Engineering, Department of Materials Engineering and Chemistry, Thákurova 7, Prague 6

166 29, Czech Republic^1

Mendel University in Brno, Faculty of Forestry and Wood Technology, Department of Wood Science, Zemdlská 3, Brno

613 00, Czech Republic^2

关键词: Adhesive compositions;    Equilibrium moisture;    Equilibrium moisture contents;    Humid environment;    Melamine-urea-formaldehyde resin;    Oriented Strandboard;    Thickness swelling;    Wood-based materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/549/1/012042/pdf
DOI  :  10.1088/1757-899X/549/1/012042

来源: IOP

【 摘 要 】

When used in construction, the properties of wood-based materials they are mainly affected by moisture. Moisture sorption and the associated swelling has an impact on the resistance of materials to biocidal attacks, on their mechanical properties or air permeability, and on comfort of use and durability of the structure. Equilibrium moisture content (EMC) and thickness swelling (TS) depending on the relative humidity for plywood (PW), particleboard (PB) and oriented strand board (OSB), for load-bearing purposes in humid environments and bonded with melamine-urea-formaldehyde resin (MUF), are studied in detail in this paper. Equilibrium moisture content and thickness swelling are influenced by the type of material, density, quantity of adhesive composition, and paraffin. The highest values of equilibrium moisture content were found in plywood, whilst the highest thickness swelling was achieved by OSB. A high dependency of nonrecoverable thickness swelling on the equilibrium moisture of the material was also ascertained. The proportion of nonrecoverable thickness swelling increases exponentially, in particular if the material's equilibrium moisture content exceeds 12%.