2966 



Chapter 24 



3 INCH FACE 

 1-1/2 INCH CORE 



INCH FACE 

 AND CORE 



3 INCH FACE 

 AND CORE 



5000 



4000 



FLAKE THICKNESS 



90 



TO- 



GO 



50 



1 1 1 1 



FLAKE THICKNESS 



FACE 0.015. CORE 025 ....g ^„ ^^^E 



AND CORE 

 FACE 0.020. CORE 0.020 



3 INCH FACE 

 1/2 INCH CORE 



41 42 



DENSITY (PCF) 



43 



Figure 24-33. — Effect of flake length and thickness in faces and core, and panel density 

 (ovendry weight and volume at test) on modulus of elasticity (top), modulus of rupture 

 (center), and internal bond strength (bottom) of 7/16-inch-thick, phenol-formalde- 

 hyde-bonded, three-layer flakeboard with random orientation of flakes. All flakes 

 were cut on a shaping-lathe. Panels, with 5-1/2-percent resin content (applied as a 

 liquid) were tested at 72°F and 50-percent RH. Face layers were each one-fourth of 

 panel thickness. Species mix was uniform throughout the board as follows: 32 percent 

 sweetgum, 18 percent hackberry, 5 percent elms, 14 percent red oaks, 17 percent 

 ashes, 5 percent white oaks, and 9 percent pecan. (Drawing after Price and Hse; see 

 text footnote'.) 



