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Gewählte Master / Diploma Thesis:

Thomas Hobel (2013): Beschleunigung der Holztrocknung am Beispiel einer Düsenfeldanlage.
Master / Diploma Thesis - Institut für Holzforschung (IHF), BOKU-Universität für Bodenkultur, pp 62. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
The present work deals with the technology of jet field drying and its potential to be used in a continuous drying system. Because of the specific conditions of thin veneer sheets, in veneer drying the jet field drying is state of the art. In addition to the theoretical view of the jet field drying in the wood industry, food industry and agricultural industry a stationary jet field drying system was designed in the laboratory to collect specific data of jet field drying of sawn timber. Therefor an aluminium-box in dimensions of 560x400x320mm was used. The wood samples were fixed by holders inside the box and two hot air blowers were installed at the sides of the box to dry the wood samples. Drying experiments on pine wood samples were conducted at three different drying temperatures (90°C, 150°C and 180°C) and two different thicknesses (25mm, 40mm). Some samples were mechanically perforated and dried, to gain knowledge about the boundary layer while jet field drying. In the results the relationship between the parameters of temperature, flow rate, and perforation with the drying time were examined. With increasing temperature, a reduction of the drying time was observed. This led to drying problems such as case hardening, discoloration and cracks in the wood. Further the study showed that the perforation of timber caused a continuing reduction of drying time. Due to the limited number of drying experiments only a trend on the relationship of the drying parameters can be described. The knowledge gained from the work is promising and should be subject to further tests.

Beurteilende(r): Teischinger Alfred

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