Influence of lamella thickness and adhesive spread on the shear strength parallel to the grain of European beech edge-glued panels
DOI:
https://doi.org/10.36930/42265202Keywords:
European beech; edge-glued panel; polyvinyl acetate adhesive; adhesive bond; shear strength parallel to the grain; adhesive spread; lamella thickness; design of experiments; regression model; process optimizationAbstract
The article investigates the influence of polyvinyl acetate (PVA) adhesive spread and lamella thickness on the shear strength parallel to the grain of edge-glued panels manufactured from European beech (Fagus sylvatica L.). The relevance of the study is determined by the growing demand for improving the mechanical performance and reliability of glued solid wood products while simultaneously reducing adhesive consumption and increasing the efficiency of furniture manufacturing processes. The aim of the research was to determine the quantitative relationships between adhesive spread, lamella thickness, and the shear strength of adhesive joints, as well as to establish their optimal combination using the methodology of the design of experiments and mathematical modelling. The object of the study was the adhesive bonding process during the manufacture of beech edge-glued panels. The subject of the research was the dependence of shear strength parallel to the grain on adhesive spread and lamella thickness. Experimental investigations were carried out using a two-factor experimental design with adhesive spread ranging from 170 to 210 g/m² and lamella thickness varying from 18 to 26 mm. The experimental results were processed using regression analysis, statistical evaluation according to the Student’s t-test and Fisher’s F-test, and response surface methodology to determine the optimal technological parameters. The obtained results demonstrated that the shear strength of the glued panels varied from 12.501 to 14.240 MPa, while the influence of both investigated factors was nonlinear and characterized by the presence of a distinct optimum. A second-order regression model adequately described the experimental data and enabled prediction of the mechanical properties within the investigated factor space. The highest predicted shear strength of 14.476 MPa was achieved at an adhesive spread of 196 g/m² and a lamella thickness of 23 mm. The study confirmed that the maximum mechanical performance is achieved not at the highest values of the investigated parameters but at their rational combination. The developed mathematical model can be applied for predicting the strength characteristics of edge-glued panels, optimizing adhesive consumption, improving production efficiency, and ensuring stable product quality. The obtained results provide a scientific basis for improving the manufacturing technology of beech edge-glued panels and can be used in the development of industrial technological regulations for furniture production
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