Open AccessMoisture sorption and thickness swelling of wood-based materials intended for structural use in humid conditions and bonded with melamine resin
Author(s) -
Martin Böhm,
Klára Kobetičová,
Jiří Procházka,
Robert Černý
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/549/1/012042
Subject(s) - swelling , equilibrium moisture content , materials science , composite material , oriented strand board , sorption , moisture , adhesive , water content , curing (chemistry) , relative humidity , porosity , geotechnical engineering , chemistry , adsorption , layer (electronics) , physics , organic chemistry , engineering , thermodynamics
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%.