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    Liquid sorption characterisation of Norway spruce heartwood and sapwood using a muiticycle Wilhelmy plate method

    Year: 2018

    Journal: Int. Wood Prod. J., Volume 9, page 58–65

    Authors: Sjokvist, T.; Walinder, M. E. P.; Blom, A.

    Organizations: Formas EnWoBio [2014-172]

    Keywords: Picea abies; water; octane; extractives; permeability; pit aspiration; coating and durability

    A multicycle Wilhelmy plate method was applied to study the water and octane sorption behaviour of small Norway spruce veneers. Dry heart- and sapwood samples of varying density were investigated. The results showed a correlation between the porosity and the sorption of octane for all samples, i.e. a higher wood porosity resulted in higher octane sorption. However, no difference in octane sorption was found between heart- and sapwood samples of similar density. The water sorption behaviour was difficult to interpret, probably due to the influence of surface-active wood extractives. It is suggested that the presence of such extractives, particularly in the sapwood samples, increases the sorption of water due to a significant decrease in its apparent surface tension. Hence, the results indicate that the liquid water sorption of spruce heart- and sapwood is strongly influenced by variations in the extractives content rather than by the micromorphology.
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