会议时间：2019年3月21-23日
会议地点：奥地利·格拉茨
演讲嘉宾：Günther Kain
                  HTBLA Hallstatt, Salzburg University of Applied Sciences, Austria

摘要：

Bark is a highly efficient natural tree protective layer with outstanding properties. It is a classic by-product of the wood industries and most of the time directly burned where it accrues. The present study focuses on using bark as a material in form of thermal insulation panels.
The general trend towards energy efficient building constructions has led to an increased need of insulation materials. Basically organic (hydrocarbons) and inorganic insulation materials can be distinguished, whereby the first group is dominated by petrol based products (polystyrene) and the second one is mainly mineral wool which both have a rather poor ecological performance because of non-renewable resources or an energy intensive production process.
An option could be low density bark-based panels which proved to be a promising insulation material and are especially interesting because one makes use of the natural ‘tree insulation material’ bark. Bark has very advantageous properties like a low density, a relatively high resistance against microorganisms and a low thermal conductivity, whilst also having a high heat storage capacity. Also from an economic point of view, the material is very interesting as bark is a traditional by-product of timber manufacturing and is so far not used a lot for products with a higher value added.
Therefore, insulation boards made out of differently fractionated bark particles and a tannin-hexamine resin were produced. These panels were manufactured with a comparatively low density of lower than 500 kg/m³. Furthermore, themechanical and thermal properties of the bark panels were evaluated.
Measurements showed that the mechanical properties (MOR, MOE, internal bond, tensile strength and compressive resistance) of the bark-based panels are at a competitive edge with commonly available insulation boards.
In terms of the thermal characteristics, the bark based panels showed thermal conductivity values higher than those of very light insulation boards, nevertheless the application as insulation material is possible. By analyzing the thermal diffusivity (material property describing the rate at which heat flows through a material) of bark based panels, their performance is clearly superior to existing insulation boards.
On the one hand, a raw material source for a booming industry was found, on the other hand, the study of a natural thermal insulator could lead to improved materials for future requirements.

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