Evaluation of the glue line in CLT panels and in other wood composite products in general is of great interest. Non-destructive methods such as determination of the velocity of ultrasound waves going through the materials are commonly applied to evaluate wood products. The present work is aimed at mapping ultrasound velocity (UV) to identify problems of glue line delamination in CLT panels of 3 and 5 layers made from Gmelina arborea and Tectona grandis timber. The results showed higher UV in the 3-layered panels in both timber species, and low UV and the presence of regions of low velocity in UV isocurves of the 5-layered CLT panels, due to separation of glue line, such as un-gluing and delamination. A UV reference value for glue line free of delamination problems of 927 and 1039 m/s was set for CLT panels of G. arborea of 3 and 5 layers, respectively, and of 1073 and 946 m/s for CLT panels of T. grandis of 3 and 5 layers, respectively. Values below the UV reference suggest the presence of some anomalies or problems of delamination, such as gluing defects.

一般而言，对CLT面板和其他木质复合产品中的胶合线进行评估非常重要。非破坏性方法（例如确定穿过材料的超声波的速度）通常用于评估木制品。本工作旨在绘制超声速度（UV），以识别由Gmelina arborea和Tectona grandis制成的3层和5层CLT面板中胶线分层的问题。木材。结果表明，由于胶合线的分离（例如脱胶），两种木材物种的三层面板中的紫外线较高，而五层CLT面板的UV等曲线中的紫外线较低，并且存在低速区域。和分层。对于3层和5层的G. arborea的CLT面板，将无分层问题的胶水线的UV参考值分别设置为927和1039 m / s，对于T. grandis的CLT面板，将UV参考值设置为1073和946 m / s分别为3层和5层。低于UV参考值的值表明存在某些异常现象或分层问题，例如胶合缺陷。