OSB- Oriented Strand Board
OSB boards (Oriented Strand Boards) are wood composite material produced out of long, thin chips, so-called strands. OSB is used as building boards in structural work (e.g. roof plating) and in interior construction as walls. In flooring it is used as laying boards (slot-and-groove profile). For visual floors, in attic conversions, and as a facade it is used as a decorative element thanks to its chiselled look, also in furniture production for shelves and racks. Furthermore it is used for packaging (chests, cable drums, paletts), store and fair construction, construction site fences, and as concrete shell boards. Several OSBs glued together can function as wall and ceiling elements in timber house construction.
OSB is one of the 'Engineered wood products' which were developed in the 50s in the USA and Canada. Their goal was to create a board with almost the same technical features as plywood, but using sufficiently available, quickly growing wood material, with a small trunk diameter. They deliberately used long, thin strands in production, that were layered oriented and pressed. Classic OSB consists of 3 layers. The cover layer chips oriented in production direction maximise the board's bending strength.
In total the global production capacity for OSB makes up about 40 million m³. The largest capacities are in the USA, Canada, and Europe (especially in Germany and Romania). Countless new plants have started to work in Russia recently. Asia has also seen a break-through: In the meantime there are countless plants in China and South-East Asia.
Logs are the optimum raw material for OSB production. Mainly fresh wood is used to produce the strands to ensure their high elasticity. Dry wood on the other hand is brittle and results in too much fine material during chipping.