Kuorihävikin vähentäminen harvesterihakkuussa - PUUT35

Translated title of the contribution: Control of bark losses in single grip harvester cutting

Harri Liiri, Antti Asikainen, Ari Erkkilä, Heikki Kaipainen, Jouko Aalto

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

3 Citations (Scopus)


The bark losses due to unwanted debarking in mechanised cuttings are estimated to correspond to 2 TWh of energy. Therefore actions to decrease peeling and reroute bark to energy production is important. In addition, peeling of bark causes damages to the surface layers of industrial roundwood lowering therefore its added value. Bark's peeling is at its highest during the sap season when it is approximately three times higher compared to the rest of the year. This projects aim is to decrease the level of bark's peeling in cutting done by a single grip harvester significantly. To achieve this goal, the level of bark's peeling and its characteristics were determined in different season. Also mechanics of delimbing knives knot-cutting process were studied. It was found that lowering of delimbing knives' pressure to one third of its normal values reduced the unwanted debarking most significantly. Also decrease in feeding rolls' pressure had a similar effect.
Translated title of the contributionControl of bark losses in single grip harvester cutting
Original languageFinnish
Title of host publicationPuuenergian teknologiaohjelman vuosikirja 2003
Subtitle of host publicationPuuenergian teknologiaohjelman vuosiseminaari
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
ISBN (Electronic)951-38-6288-7
ISBN (Print)951-38-6287-9
Publication statusPublished - 2004
MoE publication typeB3 Non-refereed article in conference proceedings
EventPuuenergian teknologiaohjelman vuosiseminaari - Jyväskylä, Finland
Duration: 17 Mar 200418 Mar 2004


SeminarPuuenergian teknologiaohjelman vuosiseminaari


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