In this study, two groups of black walnut specimens were dried by intermittent radiation, 2 minutes for a radiation cycle, microwave radiation power of 200 W (second output), the actual microwave radiation time in each radiation cycle take 2 levels (35/30, 30/25). 35/30 represents the first 40 radiation cycles of microwave drying. The actual microwave radiation time per cycle is 35 seconds, the actual microwave radiation time per cycle in the follow-up radiation cycle is 30 seconds, 30/25 indicates that the actual microwave radiation time per cycle in the first 40 radiation cycles is 30 seconds, and the actual microwave radiation time per cycle in the follow-up radiation cycle is 25 seconds, and all of them are radiated at the beginning of each radiation cycle. The other group of specimens were dried by conventional hot-air drying. The dry and wet-bulb temperatures were set at 60 C and 55 C respectively in the initial stage of drying. When the moisture content was reduced to below 15%, the wet-bulb temperature was adjusted to 45 C.
The end and side surfaces of the specimens were sealed by J-B Weld and aluminum foil, and the aluminum foil was removed after the resin was fully cured for 48 hours.
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