Plywood is one of the most widely used wood-based panel product in the world. In plywood production the most common species like birch, spruce, poplar and pine are used. In Nordic-Baltic region of Europe plywood is mainly made from birch (Betula pendula Roth). It is constructed by combining layers of veneers with an adhesive. For sustainability and efficient utilisation of local forest resources recently low-quality wood species have gained attention as alternatives to main species (Akkurt et al. 2022; Rohumaa et al. 2021; Kallakas et al. 2020). However, the properties of plywood from alternative wood species e.g. the effect of veneer thickness on screw withdrawal have received less attention. Screw withdrawal properties are very important for engineered wood structures and wood furniture industry. In this research, the performance of plywood produced from aspen (Populus tremula L.) and black alder (Alnus glutinosa L.) veneers with different thickness were compared in screw withdrawal capacity to birch plywood in three principal directions.
Keywords: veneer, plywood, aspen, birch, black alder, screw withdrawal capacity
Authors
Tolgay Akkurt
Tallinn University of Technology, Estonia
Jaan Kers
Tallinn University of Technology, Estonia
Anti Rohumaa
Tallinn University of Technology, Estonia
South Eastern Finland University of Applied Sciences, Finland
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