杉木积成材的平面密度分布特征

为了研究杉木Cunninghamia lanceolata积成材的平面密度分布规律，用计算机断层摄影技术（CT）对其平面密度的分布情况进行了无损检测。结果表明：CT能非常直观、清楚揭示杉木积成材的平面密度分布规律；杉木积成材表层和底层平面的密度较高，而芯层平面的密度较低；木束条各接头处的密度存在变异；木束条尺寸的大小、接头的接合情况，以及铺装的均匀程度等都对杉木积成材平面密度的分布有较大影响；杉木积成材与定向刨花板、普通刨花板相比，其表层平面的条状特征非常明显。图5参17

Distribution characteristics of horizontal density of Chinese fir oriented laminated stick lumber (OLSL)

In order to investigate the distribution rules of horizontal density in Chinese fir （Cunninghamia lanceolata） oriented laminated stick lumber （OLSL）, non-destructive testing was performed by computed tomography （CT） detection. The results were as follows： （1） CT detection could vividly and intuitively reveal the distribution characteristics of vertical and horizontal density in Chinese fir OLSL. The densities in surface plane and bottom plane were higher than that in the central plane, and that densities varied signifi-cantly in each joint. （2） Size of wood sticks, combined state in each joint and degree of forming uniformity had great influence on the distribution characteristics of horizontal density in Chinese fir OLSL. Compared with oriented strand board（OSB） and particleboard, the characteristic of stick-shaped structure in Chinese fir OLSL was more obvious under CT detection. Ch, 5 fig. 17 ref.]