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首页> 外文会议>7th World Conference on Timber Engineering, WCTE 2002 Vol.1, Aug 12-15, 2002, Shah Alam, Malaysia >MONITORING OF ADHESIVE-LAYER CURING IN WOOD-BASED MATERIAL USING MICROWAVES
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MONITORING OF ADHESIVE-LAYER CURING IN WOOD-BASED MATERIAL USING MICROWAVES

机译：利用微波监测木材基胶粘剂的固化

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Wood-based materials like plywood, LVL and glulam are jointed together with wood adhesives. Adhesive failures not only decrease the strength of the material, but also compromise the safety of structures where wood-based materials are used as load-bearing members. In this study, microwave attenuation by adhesive-layer was measured using a free space method; a non-destructive and non-contact method. Furthermore, the feasibility of microwave measurements for evaluation of adhesive strength and detection of adhesive failure and unevenness during adhesive curing was examined. In this report, the following points were examined: (1) influence of the angle formed by microwave propagation directions and adhesive-layer in wood based material on its attenuation, (2) the relationship between microwave attenuation and adhesive strength during adhesive curing, (3) attenuation distribution during adhesive-layer curing. The experimental results were as follows: (1) attenuation during adhesive-layer curing increased more when adhesive-layer was parallel to the direction of microwave propagation and longitudinal direction of wood was parallel to the direction of the electric field of the microwave, (2) a positive correlation between changes of microwave attenuation and adhesive strength was confirmed, (3) in the initial stage of adhesive curing, detection of unevenness in adhesive-layer would be possible by microwave attenuation measurements, and in each curing time, adhesive strength distribution could be estimated by attenuation change.
机译：胶合板，LVL和胶合层之类的木质材料与木材粘合剂粘合在一起。粘合失败不仅降低了材料的强度，而且还损害了将木质材料用作承重构件的结构的安全性。在这项研究中，使用自由空间法测量了粘合剂层对微波的衰减。非破坏性和非接触式方法。此外，检查了微波测量在评估粘合强度以及检测粘合固化过程中粘合失效和不均匀性方面的可行性。在本报告中，研究了以下几点：（1）微波传播方向和木质材料中粘合剂层形成的角度对其衰减的影响；（2）粘合剂固化过程中微波衰减与粘合强度之间的关系；（ 3）粘合剂层固化期间的衰减分布。实验结果如下：（1）当粘合剂层平行于微波传播方向且木材的纵向平行于微波电场方向时，粘合剂层固化过程中的衰减增加更多，（2 ）证实了微波衰减的变化与粘合强度之间的正相关关系，（3）在粘合剂固化的初始阶段，可以通过微波衰减测量来检测粘合剂层的不均匀性，并且在每个固化时间中，粘合剂强度分布可以通过衰减变化来估算。

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