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Producing pulp quality chips in the woods: a short term study on three portable delimber-debarker systems

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https://ir.library.oregonstate.edu/concern/graduate_projects/qv33s2643

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  • The Pulp and Paper Industry in the Pacific Northwest is obtaining an increasing share of its fiber supply by chipping small diameter trees from thinnings, insect damaged stands, and stand conversions. Since most of the mills require pulp grade fiber to contain less than 0.5% bark, the timber must be debarked prior to chipping. Traditional single-stem debarking operations have proven to be expensive compared with multiple-stem alternatives. Thus, three portable chain-flail delimber-debarker systems have recently been developed in the Pacific Northwest. Two of the systems employ self-contained prototypes capable of simultaneously delimbing and debarking multiple whole-tree loads. The third is a two-machine system, with a mobile chain-flail delimber. Chip samples obtained during short-term productivity studies averaged 0.5%, 0.7%, and 1.5% in bark content, for the two selfcontained units and the two-machine system, respectively. The most productive of the three operations manufactured 170 Bone Dry Tons (BDT) of pulp grade chips per shift. Delimbinig-debarking-chjppjng costs were $10.63 per BDT, with a 37% utiliationi rate. with minor machine modifications and better harvest system balancing, production is expected to double.
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