Grain Angle through Flake Thickness: Effect on Properties of a Structural Flakeboard.
Forest Service research paper,
FOREST PRODUCTS LAB MADISON WIS
Pagination or Media Count:
The strength and stiffness of solid wood is affected greatly by the slope of grain through the specimen. This raises the question of whether the strength of a flake-type structural particleboard is affected in a similar manner with similar slopes of grain through the flake thickness. To explore this relationship, 0.020- by 12- by 2-inch-long Douglas-fir flakes were made at various carefully controlled grain angles through the thickness. Tests on 12-inch-thick flakeboards made with 5 phenolic resin showed that the reduction in strength as related to slope in grain was almost identical to that in solid wood. With a slope in grain of 15, the tensile strength parallel to the face was slightly less than 40 of that in test specimens having parallel grain. The linear movement of the flakeboards was also appreciably affected by slope in grain, being about five times as much with a slope of 15 as it was with parallel grain.
- Wood, Paper and Related Forestry Products