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- Title
New drum-chipping technology for a more uniform size distribution of wood chips.
- Authors
Gard Timmerfors, Jessica; Sjölund, Torbjörn; Jönsson, Leif J.
- Abstract
Wood chips from a novel type of drum chipper were compared to wood chips from a conventional disc chipper in an evaluation based on demonstration-scale and industrial-scale machinery. The evaluation was performed as the wood chippers were used as production machines in a kraft pulp mill using softwood. The average bulk density of the wood chips from the disc chipper and the drum chipper was similar and within the range of 138–140 kg/m3. The size distribution of the wood chips was investigated using a conventional screening method, and by using an automatized image-analysis system based on laser scanning. The average length was set to be the same, but the wood chips from the drum chipper had a more uniform length. The average thickness was similar, but the drum chipper generated slightly more thinner wood chips. Compared to the disc chipper and using the screening method, the drum chipper generated a similar fraction of oversized and overthick wood chips, 51% more large accept chips, 11% more total accept chips, and 74% less pin chips and fines. Image analysis resulted in similar data. The results indicate that drum chippers warrant further attention as an alternative to conventional industrial-scale disc chippers.
- Subjects
WOOD chips; SOFTWOOD; SULFATE pulping process; CHIPPERS (Landscape equipment); TECHNOLOGICAL innovations; PULP mills; IMAGE analysis
- Publication
Holzforschung: International Journal of the Biology, Chemistry, Physics, & Technology of Wood, 2020, Vol 74, Issue 2, p116
- ISSN
0018-3830
- Publication type
Article
- DOI
10.1515/hf-2018-0279