3044 



Chapter 24 



used for two-ply cores and 1/10- or 1/8-inch-thick veneer for single-ply cores. 

 Panels were pressed to 3/4-inch thickness with density of 0.77 to 0.80 g/cm\ 

 Measured optically across both panel directions, these veneer-reinforced com- 

 posites had linear expansion between 47 and 93 percent RH of about 0.06 

 percent in the direction of veneer alignment — a value close to that of five-ply, 1/ 

 2-inch-thick southern pine plywood and slightly less than that for a 3/4-inch- 

 thick, all-random-flake sweetgum panel (fig. 24-55). When disk-refined fibers 

 or planer shavings were fabricated into homogeneous and veneer-reinforced 

 panels, percentage reduction in linear expansion by veneer reinforcement was 

 greater than with flakes. 



RANDOM FIBER 

 OR PARTICLE MAT 



Figure 24-54. — Principle of manufacture of composite panels with single-ply and two- 

 ply veneer reinforcement. (Drawing after Suchsland et al. 1979.) 



