Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern
Help
 

GeoTreesearch


Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

(534 KB bytes)

Title: Manufacturing Hardwood Dimension Products Directly from Logs: Potential Opportunities

Author: Kline, D. Earl; Lin, Wenjie; Araman, Philip A.

Date: 1993

Source: Proceedings, The Forest Industries 21st Wood Technology Clinic Show. pp. 1-19.

Publication Series: Not categorized

Description: When a hardwood log is sawn into lumber, over 16 percent of the volume is converted to sawdust. Furthermore, 12 percent of the log is converted to slabs and 17 percent is converted to edging and trimming pieces, all of which are chipped. Hence, less than 55 percent of the log is actually converted to lumber. Lumber must meet the requirements of specific NHLA grades and the traditional market expectation of minimal wane. Lumber lengths commonly range from 8 to 16 feet in even-numbered foot increments. Odd-numbered foot lengths are allowed but are not common. The lumber produced is then dried (5 to 10 percent shrinkage) and cut into dimension parts, eliminating undesirable features such as knots, splits, checks, stain, and warp. Typically, the part yield or the ratio of the volume of dimension parts to the volume of lumber is under 60 percent. Given all of these process conversion losses, the dimension yield from logs is less than 31 percent. This dimension yield can be well below 25 percent when considering low grade hardwood timber resources and the accumulation of inefficiencies for the many processing steps that are required. Many techniques have been suggested to improve the overall dimension product yield from logs, including back-gages, thin kerf saws, and computer automation. However, as the price of the wood raw material increases and as availability and environmental constraints further limit the volume of high grade logs that can be harvested, all available options for better utilizing our precious raw materials need to be explored. Virginia Tech has been investigating the option of cutting logs directly to parts, eliminating the lumber step. The objective of this investigation has been to determine if it is economically feasible to produce rough green dimension parts directly from No. 3 Grade red oak logs. This paper will highlight the findings of this investigation, including: 1) the potential dimension yield from No. 3 Grade red oak logs, 2) the productivity of a direct processing mill, and 3) the profitability of a direct processing mill.

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Kline, D. Earl; Lin, Wenjie; Araman, Philip A. 1993. Manufacturing Hardwood Dimension Products Directly from Logs: Potential Opportunities. Proceedings, The Forest Industries 21st Wood Technology Clinic Show. pp. 1-19.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.