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Prototype Cutterhead for Shaping-Lathe Headrigs Yields Pulp Chips and Cants

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Abstract:

Prior trials have demonstrated the feasibility of producing cants or rounded veneer bolts on shaping-lathe headrigs equipped with cutterheads that flake residues for structural flakeboard. This experiment demonstrated that shaping-lathe headrigs equipped with proper cutterheads will yield hardwood (oak) or softwood chips (1-inch long and 3/16-inch thick) suitable for pulping. Four-knife cutterheads running at 600 rpm, or three-knife cutterheads running at 800 rpm, will produce satisfactory pulp chips when scoring knives mounted ahead of chipping knives establish chip length. At a cutterhead speed of 600 rpm, negligible oversize chips and few fines were produced; lower cutterhead speeds yielded more oversize chips, and higher speeds more fines, but these differences in chip size distribution were small. Laboratory-scale pulping trials at a kraft mill indicated good fiber yield; the experimental loblolly pine chips cooked well in both batch and continuous processes, and were compatible with conventionally cut pulp chips.

Document Type: Journal Article

Affiliations: Leader, Special Project, Utilization of Lodgepole Pine in North America, USDA Forest Service, Intermountain Forest and Range Experiment Station, Missoula, Montana 59806

Publication date: August 1, 1983

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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