Plywood is a widely used material that finds many applications both as a construction and decorative material. In the last six years the production of plywood increased worldwide by 40% (Kawalerczyk et al. 2019a). The commonly used resins for plywood production are urea- formaldehyde adhesives. Despite many advantages, UF resin also have disadvantages such as formaldehyde emission and low water resistance. One of the most effective method for improving parameters of UF resin is the addition of various fillers (Pawlak et al. 2018). Many types of natural fillers have been the subject of ongoing research but the number of publications on UF resin modification with bark is very scarce. Birch bark is the waste product during wood mechanical processing. The woodworking industry generate great quantity of waste bark each year. The most common method of utilizing bark is to incinerate it, despite of its low heat production and high ash content (Ružiak et al. 2017; Réh et al. 2019). In Pedieu et al. (2009) studies the birch bark particles were used in the core layer of particle board with fiber-reinforced surface. They discovered that 70% of wood fibers could be replaced with birch bark while maintaining the required properties of the panels. Thus, the aim of the work was to investigate the possibility of replacing technical flour with birch bark in plywood production.
Keywords: plywood, birch bark, urea-formaldehyde
Authors
Radosław Mirski
Jakub Kawalerczyk
Poznań University of Life Sciences, Poznań, Poland
Dorota Dziurka
Adrian Trociński
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