. Converting forest residue to structural flakeboard : the fingerling concept. Particle board; Wood waste Recycling. The Research and Development (R£D) team recognized early the need for mechaniza- tion of fingerling and flake production. Different size classes of residue by geograph- ical sections of the country suggested that the problem of reducing residues to finger- ling chips be split for research assignment. The North Central Station pursued the problem of chippping the smaller residues, while the Forest Products Laboratory sought out equipment for chipping larger residues. Small Residu
. Converting forest residue to structural flakeboard : the fingerling concept. Particle board; Wood waste Recycling. The Research and Development (R£D) team recognized early the need for mechaniza- tion of fingerling and flake production. Different size classes of residue by geograph- ical sections of the country suggested that the problem of reducing residues to finger- ling chips be split for research assignment. The North Central Station pursued the problem of chippping the smaller residues, while the Forest Products Laboratory sought out equipment for chipping larger residues. Small Residue The North Central Station found that conventional chippers produced chips that varied too much in length to make suitable fingerlings. This led to the invention of a spiral head chipper (fig. 3). Although this machine would cut 95 percent or more of the pieces to the length set by the cutter, many exceeded the 1- by 1-inch cross section required for fingerlings. A hammermill with the grates removed reduced the oversized pieces to finger-sized particles in one pass. The structural flakeboard made from the aspen and spruce had very good strength (Erickson 1976). The similar problem of oversized fingerlings occurred when lodgepole pine, Douglas- fir, and larch were chipped for this study. Hammermilling was needed to reduce chips to fingerling size. Redesigning the blades in the spiral head chipper may eliminate the need for hammermilling. Conventional drive-shaft-mounted strain-gaging methods were used to measure torque over cutting time and hence specific horsepower requirements by species. The western species chipped required slightly higher horsepowers than Michigan-cut wood based on specific gravities (table 1), perhaps because of the low moisture content of the west- ern wood. Power requirements, although a little higher than with conventional chippers,. Figure 3.—Fingerling production using the spiral head chipper. 5. Please note that these images are extracted from sca
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