Colour is an important property of veneer in furniture industry. Often the furniture companies struggle with the problem that the colour of veneer from the same species ordered from different producers vary remarkably. Elevated wood treatment temperatures have generally been shown to affect wood chemistry, e.g. colour (Srinivas et al. 2012). Commonly these treatment processes are high temperature drying, thermal treatment etc. In veneer production, logs are primarily pre-heated before peeling process in order to soften the wood material. Soaking temperatures are usually in a range between 20 – 40 oC, but sometimes also higher temperatures up to 80 oC are used. Soaking temperature has been shown to affect birch veneer surface quality, e.g. colour (Rohu-maa et al. 2016). However, no systematic study has been done on Estonian hardwoods colour and on their colour response to soaking temperature. In this study the effect of the soaking temperature on colour of birch, aspen, black alder and grey alder veneers were studied.
Keywords: veneer colour, birch, aspen, alder
Authors
Anti Rohumaa
Laboratory of Wood Technology, Department of Materials and Environmental Technology, School of Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
Heikko Kallakas
Tallinn University of Technology, Department of Materials and Environmental Technology, Laboratory of Wood Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
Jaan Kers
Laboratory of Wood Technology, Department of Materials and Environmental Technology, School of Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
Natalja Savest
Anthony Chijioke Maduagwu
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