Yield and Strength of Softwood Dimension Lumber Produced by EGAR System.
Abstract
Approximately 20 billion board feet of softwood dimension lumber is manufactured annually in the United States by systems that waste considerable potentially usable material in ripping and edging of cants and flitches to fixed widths. The Edge-Glue-and-Rip (EGAR) system is designed to use the full width of each flitch sawn from a log by live sawing logs, drying round-edge flitches, ripping to the widest possible usable width; edge gluing into panels 36 to 48 inches wide, and ripping the panels to final dry widths for softwood dimension lumber. A significant increase in overall yield of 10 percent was recorded for lumber produced by the EGAR system over standard lumber. It was also significantly higher in modulus of rupture than standard. EGAR lumber showed less warp and was of higher visual grade than standard lumber, but in neither case was the difference statistically significant. Data indicate that EGAR had slightly higher stiffness properties, but the difference was not significant.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1977
- Accession Number
- ADA044579
Entities
People
- Charles Gerhards
- Hiram Hallock
- Kenneth C. Compton
- Ronald Jokerst
Organizations
- Forest Products Laboratory