Wood Biology and Wood Products, Faculty of Forest Sciences and Forest Ecology, University of Goettingen, Buesgenweg 4, 37077 Goettingen, Germany.
Department for Cutting and Joining Manufacturing Processes, Institute of Production Technology and Logistics, University of Kassel, Kurt-Wolters-Straße 3, 34125 Kassel, Germany.
Sensors (Basel). 2022 May 19;22(10):3855. doi: 10.3390/s22103855.
In this study, the surface parameters wettability, roughness, and adhesive penetration, which are important for wood bonding, were investigated and evaluated utilizing non-destructive methods after different mechanical processing. For this purpose, beech and birch finger joints were prepared with different cutting combinations (three cutters with different sharpness levels and two feed rates) in an industrial process. Effects and interactions on the surface parameters resulting from the different cutting combinations were evaluated using three Full Factorial Designs. The various cutting parameters had a predominantly significant influence on the surface parameters. The effects and identified interactions highlight the complexity of the cutting surface and the importance of wood bonding. In this respect, a new finding is that with sharper cutters, higher contact angles of the adhesives occur. The methods (contact angle measurement, laser scanning microscopy, and brightfield microscopy) used were well suited to make effects visible and quantifiable, which can be of interest for the quality control of the wood processing industry. The results can help to better understand and evaluate the design of wood surfaces via machining and the bonding of hardwoods. Possibly the results can contribute to further standardizing the production of load-bearing hardwood finger joints and making them more efficient.
本研究利用非破坏性方法，对不同机械加工后对胶合重要的表面参数（润湿性、粗糙度和胶液渗透）进行了研究和评估。为此，在工业生产中，采用三种不同锋利程度的刀具和两种进料速度的不同切割组合，制备了山毛榉和桦木指接榫。采用三因子完全析因设计，评估了不同切割组合对表面参数的影响和相互作用。各种切割参数对表面参数具有显著影响。研究结果和确定的相互作用强调了切割表面的复杂性和胶合的重要性。在此方面，新的发现是，使用更锋利的刀具时，胶粘剂的接触角会更高。所采用的方法（接触角测量、激光扫描显微镜和明场显微镜）非常适合观察和量化效果，这对木材加工行业的质量控制具有重要意义。研究结果有助于更好地理解和评估通过机械加工设计硬木表面以及胶合硬木的效果。可能的结果有助于进一步规范承载硬木指接榫的生产，并提高其效率。
