Prototype Cutterhead for Shaping-Lathe Headrigs Yields Pulp Chips and Cants
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.
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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: 01 August 1983