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RESEARCH ON OAK WOOD PROPERTIES

FOR MORE EFFICIENT HEATING

This study examines the effects of temperature, relative humidity, moisture content, and density
on the dielectric constant (ε′) and dielectric loss tangent (tan δ) of oak wood lamellae within a
frequency range of 0.079 MHz to 25.1 MHz. The hypothesis tested was conducted and the findings
in this paper will provide a basis for optimising the high frequency or dielectric heating process for
heating before bending of oak and other similar hardwoods. By Dario Pervan, Stjepan Pervan and
Miljenko Klarić, University of Zagreb, Jure Žigon and Aleš Straže, University of Ljubljana

n recent decades, high frequency heating technology has wood, increases energy efficiency and provides simple control
been widely used in the woodworking industry, particularly of thermal processes.
Ifor drying, gluing, and thermal modification of wood. Owing Compared to traditional heating methods based on heat
to its mode of operation, high frequency heating enables transfer, such as conduction, convection, and thermal radiation,
selective and volumetric heating (the ability to heat the high frequency (HF) heating is faster and more uniform.

adhesive layer without heating the rest of the element) and, The interaction between wood and an electromagnetic
when used correctly, allows for rapid and uniform heating of field is determined by the dielectric properties of wood.

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