Poplar wood as raw material for wood-based panels and pulp manufacture
Research work on the suitability of poplar wood from different clones (Muhle-Larsen, Androscoggin, Scott Pauley and Oxford), different sites and ages as a raw material for wood-based panels and paper pulps led to the following results: UF- and PF-particleboards prepared from differnt 5-jear-old clones exhibit slight differences in their elasto-mechanical behaviour. The influence of clone site is by far more important than that of the clone age. Bark content up to 15 per cent has no negative influence on the elasto-mechanical properties of UF-bonded boards. PF-bonded boards are more sensitive to bark than UF-boards. Cellulosic pulps were prepared using the neutral sulphite semichemical (NSSC) and the sulphate pulping methods. NSSC-pulps from poplar wood are in general of higher mechanical properties compared to beech NSSC-pulps. Bark up to 15 per cent can be tolerated in NSSC-pulps as far as the mechanical properties are concerned. Mechanical properties of sulphate pulps depend on clone and the pulping conditions used. In general, mechanical properties of pulps showed more sensitive response towards clone variation than the properties of UF- and PF-particleboards.