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木材是由树木茎部的各种各样的细胞组成,这些细胞具有比较坚固的细胞壁.细胞壁由微粒组成,微粒的宽度自50—60?,长度自500—750?(1个?=10~(-8)厘米).微粒表面有吸收水分的能力,因此在木材的细胞壁中无数的微粒间形成了许多的极薄水层.当木材吸收到水分时,先被细胞壁所吸着,这种水称为“吸着水”或“胞壁水”.等到细胞壁被水分浸透,就开始填入细胞腔内及细胞间隙中,这种水称为“自由水”或“毛细管水”.此外,在细胞壁中还有极少量的
Wood is composed of a variety of cells in the stems of trees, which have relatively robust cell walls, which consist of particles with a width of from 50 to 60 μm and a length of from 500 to 750 μm (-8) cm.) The surface of the particle has the ability to absorb moisture, so many thin layers of water form among the numerous particles in the cell wall of the wood.When the wood absorbs moisture, it is first adsorbed by the cell wall, Called “sorption water” or “cell wall water.” Wait until the cell wall is saturated with water, began to fill the cell cavity and intercellular space, this water is called “free water” or “capillary water.” In addition, There are a very small amount of