Dynamic behavior of liquid penetration in softwoods
2001
Kawai, A. (Kyoto Prefectural Univ. (Japan). Faculty of Agriculture) | Iida, I. | Ishimaru, Y.
Various methods for the dynamic observation of liquid penetration into wood were examined, and the penetration behavior in the longitudinal direction of some softwood species was observed using the most convenient method. The following results were obtained: 1) It was found that a system of a reflecting optical microscope and a CCD camera was an effective method for a dynamic observation of liquid penetration into wood. 2) Liquid penetration into wood proceeded with repeated advances and stalls. 3) It is recognaized that stalls of penetration occurred not only at pits, but also at positions of contact between tracheida and ray cells caused by differences in wettability of lumen surfaces of tracheids and ray cells. Stalls also occurred in tracheids with spiral thickenings. 4) Penetration of water into wood was compared with that of a surfactant solution having lower sarface tension than water. As a result, the rate of penetration into hinoki heartwood increased remarkably by addition of the surfactant. Accordingly, it was consdered that wetterbility by liquids of lumen surfaces of trachaids play a prime role in the penetration of liquids into hinoki
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