Interest in the use of beech wood in construction is growing steadily. Considering its high mechanical performance, it has a large potential to be used for the production of glued timber structural products. However, the issue of structural bonding remains to be solved before effective production and safe use of beech wood in these products can be achieved. Three adhesives (one-component polyurethane – PUR, PUR + primer and melamine-urea–formaldehyde – MUF) and two press systems (hydraulic and vacuum press) were explored in the production of pure beech and combined beech-spruce-beech cross laminated timber (CLT). An evaluation of the bonding quality was performed with both standardized and optimized (the specimen layers were oriented with the wood grain forming an angle of 45° with respect to the load application) delamination and shear test methods.

None of the adhesives that were tested met the requirements for delamination tests provided by the current standard for softwood. Specifically, PUR yielded the poorest performance in the production of the CLT panels entirely made of beech; the addition of a primer improved the bonding, achieving results comparable to those observed for MUF. On the contrary, in the production of beech-spruce panels, the three adhesives showed similar results. The press system was not a relevant factor in terms of bonding quality.

In regard to testing, a size effect was noticed in the delamination test: the larger the specimen the greater the delaminations that were observed. The shear tests on dry specimens proved to be less efficient in determining the influence of the several bonding parameters, even if a 45° grain orientation seemed to reduce the rolling shear during the shear test and to improve the response of the test in this regard. Combining delamination pretreatment and shear made the test more sensitive and objective.

对在建筑中使用山毛榉木的兴趣正在稳步增长。考虑到其高机械性能，它具有很大的潜力可用于生产胶合木结构产品。但是，在有效生产和安全使用山毛榉木产品之前，必须解决结构粘合的问题。在生产纯山毛榉和山毛榉-云杉-山毛榉复合横切木料的生产中，探索了三种粘合剂（单组分聚氨酯-PUR，PUR +底漆和三聚氰胺-脲-甲醛-MUF）和两种压制系统（液压和真空压制）。 （CLT）。

所测试的胶粘剂均未达到当前软木标准提供的脱层测试要求。具体而言，在完全由山毛榉制成的CLT面板的生产中，PUR的性能最差。底漆的添加改善了键合，获得了与MUF观察到的结果相当的结果。相反，在山毛榉云杉面板的生产中，这三种粘合剂显示出相似的结果。压制系统不是粘合质量的重要因素。

关于测试，在分层测试中注意到了尺寸效应：样本越大，观察到的分层越大。事实证明，在干燥试样上进行的剪切试验在确定几个粘结参数的影响方面效率较低，即使45°晶粒取向似乎在剪切试验过程中减少了滚动剪切并改善了这方面的响应。结合分层预处理和剪切，使测试更加灵敏和客观。