827 Thermal modification of wood

Published: 28 August 2012

The aim is to investigate whether heat treatment can be supplemented with hot oil treatment to reinforce wood products durability in outdoor conditions, especially in ground contact.

Area: Durability of wood
Budget: 70 000 SEK
Duration: september - December 2011
Project Manager: Tom Moren, LTU

Background

Heat treatment of wood is a method using an environmentally friendly process changing the timbers
properties. The technology used in Scandinavia is based on drying and heating in
steam environment, either superheated steam (ThermoWood) or saturated steam (WTT). In
both cases the wood reacts quite similar, and it is reflected in an improved
dimensional stability and resistance, a reduced hygroscopicity and strength, while
hardness and stiffness is marginally affected. Mutual for these reactions, as well as
 for the most noticeable color change to brown, is that they are strongly
temperature dependent which means a process technical advantage as the temperature level is
relatively simple to control. The material properties are related to the process, time
and temperature.


The development of the heat treatment processes is fairly well understood, although WTT
technology is not fully developed. The greatest lack of knowledge today is in the range
heat-treated wood - the durability of outdoor exposed product type poles, decking,
panel, planks, etc.


In this preliminary study, we focus on wood reactions linked to resistance and
the issue of heat treatment according WTT method can be supplemented and reinforced with a
addition of oil impregnation (for example heat-treated spruce bars).

Aims and objectives

The study aims to investigate if heat treatment can be supplemented with hot oil treatment for
strengthening wood products durability in outdoor conditions, especially in ground contact


The goal of this project is to investigate whether heat treatment can be supplemented with oil treatment for enhanced durability in outdoor exposed products, especially in ground contact.

Final report

vänster - skarm färg (JPG).jpg

 

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