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First-thinning trees, compressed, air-dried and chippped as bunches
Dalarna University, School of Technology and Business Studies, Wood Technology.
1997 (English)Report (Other academic)
Abstract [en]

This study focuses on the power needed to compress bundles of trees, the change in moisture content of bundles during drying, and the suitability of bundles for transport and chipping. 35 bunches (597 trees in total) were formed, 5.5 m long, with green weights ranging from 209 to 954 kg. The bunches were compressed by a chain being wound once around them at three points and tightened. They were air-dried and then chipped. A small bunch is more tightly compressed at a specific force than a big bunch. The bulk density varied from 270 to 460 kg/m3 (green weight), after 16 kN compression, and from 520 to 780 kg/m3 after 53 kN. Forces less than 20 kN give smaller circumferences for pine or birch bunches than for spruce-bunches, forces greater than 30 kN give the opposite result. A compressed bunch dries almost as well as non-compressed trees. The bundles were found to be of an optimum density for efficient transport, and chipping bundles was found to be more productive than chipping individual trees.

Place, publisher, year, edition, pages
Garpenberg: Högskolan Dalarna , 1997.
Series
CITU - Arbetsdokument ; 7
Keywords [en]
air-dry, Betula Pubescens, bioenergy, bulk density, bunch, chipping, compress, force, Picea Abies, Pinus Sylvestris
Identifiers
URN: urn:nbn:se:du-896OAI: oai:dalea.du.se:896DiVA, id: diva2:522743
Available from: 2005-02-09 Created: 2005-02-09 Last updated: 2012-04-24Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Language
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
  • html
  • text
  • asciidoc
  • rtf