Artificial drying of impregnated wood

IRG/WP 3448

M-L Edlund

Sawn timber (Pinus Sylvestris) of dimension 50x150 mm was impregnated with CCA by a full-cell process. The timber was then dried in a conventional kiln or a special vacuum kiln where the timber was dried by circulating superheated steam. Drying time was 16 days and 2 days respectively. The aim of the investigation was to compare the physical appearence of the wood after drying by the two methods with particular reference to formation of checks. Moisture contents and checks were therefore recorded before and after drying. It was found that the number of checks formed was approximately the same by either drying system and no inner checks were found. The drying in superheated steam, however, caused bleeding of resin on the surface of the wood, which could be a disadvantage for some end uses.


Keywords: VACUUM DRYING; TECHNICAL DRYING; KILNING; DWT VACUUM KILN; PINUS SYLVESTRIS; CCA; MOISTURE CONTENT; CRACKS

Conference: 87-05-17/22 Honey Harbour, Ontario, Canada


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