Nothing happens until something mover
Important is also resin type used
The lowest swelling was observed when phenol-formaldehyde or pMDI adhesive were used
The highest swelling was observed when urea-formaldehyde adhesive was used
During pressing,blended particles are exposed to the high temperature that can also cause some degradation.Temperature during pressing is needed for the adhesive to cure and particles to cross link and overlap.The stronger the bond between cross-linked and overlapped particles the better the sorption properties should be.
On the other hand,
during this hydrothermal treatment wood is creating,
compressed,
causing fractures,
micro fractures and collapsed cells occurs,
thus creating the conditions for irreversible swelling
determined that stresses created due to pressing at high temperature and pressure are not released
Usually these unreleased stresses are greater in board with high density and hence boards with higher density have higher swelling and higher expansion.
The aim of this paper is present the impact of wood species used, share of adhesive and board density on thickness swelling after 24-hour immersion in water.