Low density oriented strand board
View Patent ↗A low density oriented strand board has an average density of less than about 1.5 times the density of wood species used in the board and a homogenous vertical density profile. Low density OSB may be formed by preheating the wood finish prior to pressing, controlling the moisture content such that the core layer has a higher moisture content than the face layers, or a combination of pre-heating and moisture content control.
1. A low density OSB having a homogenous vertical density profile.
2. The low density OSB of claim 1 wherein the average density is less than about 40 lb/ft 3 .
3. The low density OSB of claim 2 wherein the average density is less than about 35 lb/ft 3 .
4. The low density OSB of claim 3 wherein the average density is about 30 lb/ft 3 .
5. The low density OSB of claim 1 wherein the lowest core density is greater than about 80% of the highest surface density.
6. The low density OSB of claim 5 wherein the lowest core density is greater than about 85% of the highest surface density.
7. The low density OSB of claim 6 wherein the lowest core density is greater than about 90% of the highest surface density.
8. The low density OSB of claim 1 wherein the average density of the OSB is less than 1.5 times the density of the wood species used in the OSB.
9. The low density OSB of claim 8 wherein the average density of the OSB is less than 1.4 times the density of the wood species used in the OSB.