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Influence of wood quality characteristics on thermo mechanical pulp and refiner mechanical pulp from new zealand grown radiata pine



Influence of wood quality characteristics on thermo mechanical pulp and refiner mechanical pulp from new zealand grown radiata pine



Appita Journal 37(5): 400-408



The influence of wood age (by location in the stem), basic wood density and branch size on the quality of thermomechanical and refiner mechanical pulps of New Zealand-grown radiata pine was examined. The study was undertaken to assist the preparation of a forest management strategy that in addition to other options, would allow the production of wood of suitable quality for future mechanical pulp based industries. Wood age is the most important parameter influencing pulp properties and it is suggested that this could be the result of the effect of the tracheid length, which is positively correlated with wood age. Butt log residues produce pulps of high strength and moderate optical behavior. Top logs produce pulps of medium strength and excellent optical performance. Increased wood density, for wood in the same age class, will marginally increase both pulp energy demand and strength and will decrease the scattering coefficient. Similarly, large branches increase energy consumption and decrease sheet density and tensile strength. Wood from 175 trees grown from the same seed source in Kaingaroa Forest in the central North Island of New Zealand was used in the study. The pulps were produced in a Bauer 410, 1000 mm refiner.

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Accession: 005695965

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