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The study explores the effect of dry-bulb ( T db  ) and wet-bulb ( T wb  ) temperature oscillation in a conventional kiln on the drying characteristics of 105-mm-square Pacific coast hemlock. Five kiln-charges were dried using four oscillating drying schedules and a control. The base drying temperatures for the control were  T wb  =53°C,  T db  =60°C for the first drying phase and increased to  T wb  =65°C,  T db  =80°C in the second phase. These temperatures were oscillated at two amplitude and frequency combinations, namely, 3°C for 4 h (low) and 6°C for 8 h (high). The results indicated that the total impact of oscillating schedules on the drying rate was more pronounced at the early stages of the drying process. Oscillating  T db   at higher amplitudes increased drying rate by 12%, whereas the low amplitude counterpart reduced kiln residence time by 10–14%. The final moisture content variability decreased in both  T wb   oscillated schedules. Core and shell moisture content variation also slightly decreased in the low amplitude  T wb   oscillated schedules. High amplitude oscillated  T db   also showed 5% less casehardening than the control, whilst its low amplitude counterpart increased. The low amplitude  T wb   oscillated schedule had the least surface checks and splits.

Exploratory evaluation of oscillation drying for thick hemlock timbers