Structural Flakeboards and Composites 



3031 



HOMOGENEOUS 



RANDOM 



CORE 



HOMOGENEOUS 



ORIENTED 



CORE 



3 -LAYER 



ORIENTED 



CORE 



Figure 24-50. — Arrangements of face veneers (V) and core flakes (C). Arrows indicate 

 grain direction in veneer and flake alignment direction in oriented cores. (Left) Single 

 veneer on each face. (Right) Two veneers cross-laminated on each face. (Drawing 

 after Hse 1976.) 



Linear expansion. — Ranges of average linear expansion parallel to grain of 

 outermost face veneer were 0.137 to 1.653 percent in the 5-hour boil test and 

 0. 142 to 1 . 149 percent in VPS. Linear stability differed significantly with flake- 

 core arrangement, as follows (from table 24-27): 



Face and core 

 construction 



Single veneer 



Random 



Oriented 



Three-layer 



Two veneers, cross laminated 



Random 



Oriented 



Three-layer 



Along-the-grain expansion 



