Abstract:

In this paper, the change of moisture content (MC) of small-diameter birch lumber with the intermittent-heating and consecution-heats tests had been discussed. The result of research showed that: the drying rate of small-diameter lumber had fallen obviously after the MC getting 15%, and the rate of anaphase drying times 2～3 was prophase drying. The intermittent-heating was propitious to diffuseness of within water, but the time of intermission didn't have much effect on the drying rate. During drying, the MC grad along thickness wasn't symmetrical, which was interrelated with the more proportional heartwood of small-diameter lumber. The intermittent-heating cut the MC grads down, reduced the stress, and then improved drying quality.

Key words: small-diameter lumber, birch lumber, heating methods, moisture content(MC)