温度制御による木材のマイクロ波加熱減圧乾燥(<小特集>木質材料小特集)

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The objevtive of this study is to clarify the practical features of the new wood drying method, which combines microwave heating and vaccum, by determining the drying time and the quality of dried wood. To measure the temperature of drying wood in a microwave electric field, a thermal sensor was developed and incorporated into the microwave heating-vaccum dryer. The woods were dried by controlling the wood temperature. Beech (Fagus srenata), spruce (Picea spp.) lumbers,and persimon (Diospyros Kaki) blocks surved roughly for golf club heads weredried by the proposed new method. The results obtained are summarized as follows ; (1) The thermal sensor with the function of reflecting microwaves was improved so as to provide accurate measurements of wood temperature during heating in the microwave field. (2) By controlling the wood temperature in the new drying method, none of such defects as surface checking and haneycomb appeared in dried lumbers, and the drying time was remarkably shortened compared with the convebtional kiln-drying. (3) The present microwave heating-vaccum drying method is suitable for variously shaped wood pieces besides lumbers with flat surfaces. (4) The relation expressed by V=exp (a+bT) existed between the drying rate V and the wood temperature T irrespective of wood species. The drying rate V was highest for sapwood of beech, intermediate for spruce and persimon, and lowest for the heartwood of beech. The value of b was highest for the sapwood of beech, intermediate for the heartwood of beech and persimon, and lowest for spruce. (5) The drying operation based on the wood temperature was effective to shorten the drying time and to prevent drying defects.
社団法人日本材料学会の論文
1992-02-15

温度制御による木材のマイクロ波加熱減圧乾燥(<小特集>木質材料小特集)

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