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___i_ AgricultureDepartment°funited States A o New M'achine _:":eNorth Central., .... for Producing sF_atire_tExperiment Research Chunkwood PaperNC-211 RodgerA. Arola, RobertC. Radcliffe,SharonA. Winsauer,and EdselD. Matson North Central Forest Experiment Station Forest Service -- U.S. Department of Agriculture 1992 Folwell Avenue St. Paul, Minnesota 55108 Manuscript appproved for publication March 19, 1981 1982 l f m l ! i A NEW MACHINE FOR PRODUCING CHUNKWOOD I Rodger A. Arola, Principal Mechanical Engineer, Robert C. Radcliffe, Mechanical Engineering Technician, Sharon A. Winsauer, Computer Specialist, and Edsel D. Matson, Mechanical Engineer, ' Houghton, Michigan o As fossil fuel resources are depleted and prices esca- specified length. The largest chunks or discs produced late, there are increasing pressures for alternate indus- by these machines are equal to the bolt diameter and trial fuels. Wood is one alternative, particularly for about 2 inches long, with much fracturing along the industries located in heavily forested areas. However, a grain. The chunks produced with either device can be way is needed to reduce small trees and forest residue readily used as energy wood or as a preferred interme- into a convenient form for direct combustion as a pri- diate form for manufacturing structural flakeboard. mary or supplementary fuel or as a wood gasifier The first invention, a helical or spiral head chipper, has feedstock, been described (Barwise et al. 1977. Erickson 1976). : The latter is an involuted disc chunker (Barwise et Chips produced with conventional whole-tree chip- _d. 1982). This chunker and the results of initial pets are small and not ideally suited for solid fuel prototype testing are described here (fig.
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