Structural Flakeboards and Composites 



3041 



Figure 24-53. — Experimental 3/4-inch-thick composite oak panels comprised of rotary- 

 peeled veneer oak faces and backs hot-pressed glued to random flakeboard cores. 

 (Left) White oak panels. (Right) Southern red oak panels. (Photo from Roubicek and 

 Koch 1981.) 



ALL-OAK COMPOSITE PANELS 3/4-INCH THICK 



To compare properties of all-oak composites to those of solid oak lumber and 

 to 5-ply southern pine plywood — all 3/4-inch thick — Hse and Koch''' fabricated 

 and tested in flatwise bending 4-inch-wide and 6-inch-wide boards of each 

 material cut to 36-inch lengths, with face grain running parallel to the 36-inch 

 length. 



Half the oak composites were made of white oak and half of southern red oak. 

 For each species, 40-inch-square cores with pressed 5.5 minutes at 325°F from 

 3-inch-long, 0.025-inch thick, shaping-lathe flakes blended with 5.5 percent 

 phenol-formaldehyde resin (solid basis) applied as a liquid spray. Flakes were 

 randomly placed. Density of the cores was 46.5 Ib/cu ft at 4- to 5 -percent 

 moisture content. The cores were lightly sanded to 0.50-inch or 0.55-inch 

 thickness for overlaying with 1/8- or 1/10-inch veneer, double-spread with 1 15 

 pounds of phenol-formaldehyde glue per 1,000 square feet of double glue line, 

 and the log-run veneer faces glued to them to yield six 3/4-inch-thick panels in 

 each of the following four categories (fig. 24-53): 



Species 

 White oak 

 Southern red oak 



Face veneer thickness 

 1/10-inch 

 1/8-inch 



'^Hse, C.-Y., andP. Koch. 1981. Strengthandstiffnessof 3/4-inch-thick white oak and southern 

 red oak composite pallet deckboards made with 1/10- and 1/8-inch-thick veneer over flake cores — 



compared to 3/4-inch-thick, solid-sawn, log-run deckboards. U.S. Dep. Agric, For. Serv. 

 For. Exp. Stn., Alexandria, La., Fin. Rep. FS-SO-3201-8, dated August 26, 1981. 



South. 



