University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Gerhard Felber
(2007):
Optimierung der Erzeugung von Sägewerkshackgut für die Zellstoffindustrie.
Doctoral Thesis,
BOKU-Universität für Bodenkultur,
pp 154.
UB BOKU
obvsg
- Abstract:
- This doctoral thesis presents the results of several projects on the optimisation of the production of wood chips, performed between January 2001 and September 2005. The pressure of improving the chipping process in a sawmill came when the Papierholz Austria GmbH started to link the chip quality to the price of delivery in January 2001. Before this time only in Scandinavian countries the chip quality had a direct influence on the price. In order to evaluate the potential of existing sawmill machinery investigations were started in January 2001. The target was to understand the state of the art of machines that were in daily use. To get a wide range of information the wood chip quality in different sawmills was monitored over the period of one year. Chip samples were analysed and matched with the relevant machine data. Out of this an overview on existing machinery and chipping processes could be generated. On basis of the results from the work of the first year, two different chipping tools were developed, built and tested over a longer period on a canter chipper line. Furthermore also an economic evaluation was done. As the quality of sawmill chips changes during the winter time, especially when the wood is frozen, several tests with frozen wood were carried out. It was tried to transfer the experience gained from bending tests to the chipping process, especially for frozen wood. With the findings it could be shown, that already an optimisation of existing chipping machines can help to improve the chip quality extremely. During the work benchmarks for the chip quality and guidelines for the tuning of chipping machines could be developed. Through new tool design the chip quality could be further improved. By studying the properties of frozen wood, it was tried to detect the behaviour in the chipping process. As a result it was possible to develop machine settings for the winter time, that lead to a better chip quality.