Aspen Bibliography
Trial of a double-drum flail delimber/debarker processing small-diameter frozen timber: Phase II. Size distribution and composition of process flows, chemical pulping trials
Document Type
Article
Journal/Book Title/Conference
Special Report Forest Engineering Research Institute of Canada
Issue
SR-68
First Page
6
Last Page
26
Publication Date
1990
Abstract
The winter performance of a satellite chipping plant in Alberta was the subject of a four-week field trial undertaken in 1989 by the Forest Engineering Research Institute of Canada (FERlC). The plant employed a double-drum chain-flail delimber/debarker in series with a four-knife roadside disc chipper. The detailed analysis of the process flows and the evaluation of pulps prepared from some of the furnishes, conducted by the Pulp and Paper Research Institute of Canada (Paprican), are discussed in this report.
When small-diameter full trees-i.e. black spruce, and a spruce-pine blend-were processed, bark contents of 2.5 and 1.7% respectively (oven-dry basis) were realized in the product chips. Wood losses of 14.1 and 6.8% were incurred by the flail, compared to 3.3 and 2.1 % by the chipper. (Not measured was the loss of material associated with the handling of stems into the flail.)
When lodgepole pine pulpwood logs were fed through the system, wood losses of 6.6 and 6.4% were incurred by the flail and the chipper respectively in producing chips with a bark content of 4.1%.
Chips produced from large-diameter aspen logs had a bark content of 4.2%; from fire-killed timber, 1.1%; and from western red cedar, 7.1%.
Chips made from spruce-pine logs that were debarked instead with a ring debarker contained 0.7% bark. Wood losses associated with ring debarking and roadside chipping were 3.9 and 0.8% respectively.
Kraft pulps prepared from the spruce-pine furnish and from the pine pulpwood were similar to those prepared from the logs debarked with the ring debarker, which suggests that the action of the flail was not deleterious to pulp quality.
Recommended Citation
Berlyn, R. W. 1990. Trial of a double-drum flail delimber/debarker processing small-diameter frozen timber: Phase II. Size distribution and composition of process flows, chemical pulping trials. Special Report Forest Engineering Research Institute of Canada. SR-68: 6-26.