Solid Wood Products 2569 



Such 2-ply boards could be run through a rough mill to make dimension stock 

 without need to recognize and remove defects, and yields would increase signifi- 

 cantly if at least two — if not all three — qualities of cuttings could be utilized. 

 Suchsland's (1980) computer analysis contains graphical data on yields of 

 cuttings of four sizes from two-ply boards variously constructed of laminae 

 containing one to five defects each. He found that greatest yield gains are 

 obtained when low and high quality laminae are paired. With such pairing in 

 which one laminae had four defects and the other, one, yields of 4- by 24-inch 

 cuttings were as follows (laminae measured 96 inches long and 8 inches wide): 



Description Yield 



Percent 



Clear both sides 13 



Clear one side 75 



Repaired both sides 12 



Total yield 100 



From solid lumber boards with four defects, yield of this size cutting, clear on 

 both faces was 38 percent (fig. 22-2). 



100 



01 — 

 4x48 



I REPAIRED BOTH SIDES 



CLEAR 



BOTH 



SIDES 



t 



4x24 4x12 



CUTTING SIZES (INCHES) 



2x12 



Figure 22-2.— Yield of two-ply furniture cuttings of four sizes and three qualities com- 

 pared to clear-both-sides cuttings from solid lumber with four defects. The two-ply 

 lumber had four defects in one lamina and one defect in the other. The 4/4 boards 

 measured 96 inches long and 8 inches wide. (Drawing after Suchsland 1980.) 



