Table 11 .- -Delivered cost of fingerlings per dry ton for alternate harvesting systems 

 (NPT = nonproductive time, OH = payroll cost. ) 



$/dry ton : Adj. 40% : Adj. to 



System : (1973 cost) : for NPT and OH : 1975 cost 



I 



15. 



21 



21 . 



23 



25. 



,48 



II 



19. 



48 



27. 



27 



32. 



72 



III 



15. 



,22 



21. 



.31 



25. 



57 



IV 



19. 



01 



26. 



61 



31 . 



,93 



V 



18. 



.78 



26. 



39 



31. 



.67 



VI 



25. 



86 



36. 



.20 



43, 



,44 



MANUFACTURING STRUCTURAL 

 FLAKEBOARD FROM FINGERLINGS 



Structural flakeboard is an exterior grade panel for use as construction sheathing 

 and is one of the newer entries into the reconstituted wood panel products field. 

 Generally, it is a panel whose surfaces are mainly composed of long, thin flakes 

 (about 1.5 to 3.0 inches long and 0.020 inch thick) bonded together with a weather- 

 resistant or highly durable resin. 



Several years ago, researchers at the Forest Products Laboratory showed fingerling 

 would provide excellent furnish for ring flakers to produce the flakes for structural 

 flakeboard (fig. 8, 9) Heebink and Dominick 1971; Heebink 1972). 



Panel Performance Requirements 



Structural flakeboard must have three key properties not required in particleboard 

 commonly employed as furniture and floor underlayment : (1) durability, (2) dimensional 

 stability in width and length, and (3) capability to carry building loads even under 

 adverse environmental conditions. Common particleboards have been primarily designed 

 as "gap fillers" or to have a smooth surface; hence, structural properties were not 

 optimi zed . 



Because weather resistance was not sought, conventional boards were constructed 

 with urea resin, which is not as resistant to water or weather as the phenolic resin 

 employed in exterior grades of plywood. Phenolic resin, or a similarly durable resin, 

 should be employed in structural flakeboard. 



Exterior-grade plywood meets or even exceeds the performance desired for sheathing 

 Although structural flakeboards meeting U.S. and Canadian standards are generally infe- 

 rior in physical properties to structural plywood of equal thickness, phenolic flake- 

 boards are being used as building sheathing, floor underlayment, and cladding (Canadian 

 Standards Association 1975) in Canada. Canadian aspen flakeboard has recently been 



13 



