Drying methods aspen

The study of penetration by waterborne wood preservatives into wood was reported. Samples of three wood species, i.e. red maple Acer rubrum L.), ponderosa pine Finns ponderosa Dougl. ex Laws.) and aspen Populus tremuloides), containing different anatomical features, e.g. sapwood, heart-wood, early-wood, late-wood, and knots, were air-dried and pressure-treated with water. MRI provides a useful method for assessment of the penetrability of wood by water and consequently waterborne preservatives. 

The results correspond well to previously performed alkali extraction of aspen. The final lignin content of the bleached and spray dried product was 4.8% (Klason + acid soluble lignin), analysed according to a method described elsewhere . 

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