Лако-красочные материалы — производство

In the wood-based panels industry a great variety of wood species are used as raw materi­als. The choice of the wood species used is often determined just by the availability and the price of the raw material. Furthermore, large amounts of wood residues from the primary wood processing industry (e. g., saw mill waste) as well as old (recycled) wood are used. It is more than a proverb to say that the quality of a wood-based panel has already been established, to a great extent, before the wood reaches the wood storage area of the panel — producing mill. The mills generally try to maintain as constant in time as possible the composition of the wood species mix as well as the mix of wood origins and preparation modes for a certain board type. For various board types, different wood mixes (species, shape and size of the particles) are used. This is rather based on practical and empirical long term experience and often not on any reasoned thinking. Economic reasons (avail­ability of special wood, price) can also play an important role in the choices made.

Many papers deal with special wood species in the production of wood-based panels, but the total knowledge available on this subject is not really satisfactory. Neusser and coworkers [382,383] are two of the rare examples in the literature giving a broader over­view on this aspect: they have compared 18 different Austrian wood species by producing and testing laboratory particleboards. The test results obtained allowed adjustments for properties and density of laboratory boards. The best results were found for ash, followed by white beech and oak. However, these results may not be valid for all types of wood and all types of boards.