Sorption properties of particleboard depend on the size of the constituents, type of adhesives used, as well as from the production process. During production, especially at mat forming, variation (mass of particles) could occur, hence variations in the thickness and density and thickness swelling. From industrial particles three different particleboards were made in laboratory conditions. Urea-formaldehyde resin was used as adhesive. Particleboards were made with different core layer share. The share of core layer was 40%, 55% and 70%. Thickness swelling after immersion in water and exposure to high humidity was determined. At the exposure to high humidity the highest swelling was determined when share of core layer was 70%, while the highest thickness swelling when immersed in water was determined at particleboard with 40% of core layer.
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