3570 



Chapter 28 



RESORCINOL RESIN 

 25 



WOOD AND BARK 



398,265 



96.3% 



20,191 

 4.9% 



¥ 208,688 

 50.5% 



STEMWOOD 32,616 



FABRICATED 

 JOISTS 



FLAKEBOARD 



SHEATHING $ 



DECKING 



THICK DECORATIVE 

 PLYWOOD 



FUEL 



413,363 



TOTAL 



(i.e. 398,265 WOOD $ BARK + 15,098 RESIN ^ WAX) 

 100.0% 



Figure 28-35. — Annual materials balance for manufacture of structural flakeboard, 

 decorative plywood, and fabricated joists from low-grade southern hardwoods and 

 forest residues. Values shown are in tons, ovendry-weight basis. (Drawing after Koch 

 1982.) 



Energy requirement, annual 



Electrical energy purchased kWh 



Diesel fuel and propane for front-end loaders and 



lift trucks (oil equivalent) 150,000 gallons 



Wood residues burned (ovendry-weight basis), all available 



from mill residues 168, 186 tons 



Two recently developed machines are keys to this operation. One is the 

 swathe-felling mobile chipper (fig. 28-1 1), which follows conventional logging 

 of merchantable hardwood trees above 5 inches dbh, harvesting 80 percent of 

 remaining above-ground wood in tops, branches, and uncut cull trees for core 

 flakes of structural panels. The other key machine in the operation is a shaping- 

 lathe (fig. 18-252) to produce high-quality flakes while rounding 52-inch-long 

 bolts prior to rotary-peeling them. 



