2718 



Chapter 22 



Figure 22-69. — Location of electrometallurgical plants in the United States that used 

 wood chips in 1 970 and those that have discontinued use. Wartluft's (1 971 ) study was 

 concentrated in the Ohio and Tennessee Valley region (circled area). 



FLAKES FOR STRUCTURAL PANELS 



Mechanical properties of structural panels of hardwood flakes bonded with 

 thermosetting resins are extremely sensitive to the dimensions and density of the 

 flakes. These relationships are explained in chapter 24. Manufacture of flakes 

 for structural boards is discussed in section 18-25. Present demand in the South 

 for such flakes is minimal, but by year 2000 — probably earlier — there will likely 

 be numerous flakeboard plants in operation that will consume significant quanti- 

 ties of southern hardwood flakes. The economic feasibility of such plants is 

 discussed in Koch (1978), and in sections 28-14, 28-19, 28-23, 28-24, 28-25, 

 28-26, 28-27, 28-28, 28-29, 28-31, and 28-32. 



EXCELSIOR21 



During the first two-thirds of this century, excelsior — thin ribbon-like strands 

 of wood — was sold in considerable volume. In 1939 excelsior production of 53 

 plants in the United States totalled about 122,000 tons. Production in 1946 in the 

 Lake States was significantly greater than in 1939. Value of excelsior produced 

 annually in the United States declined from about $5 million in 1958 to about $3 

 million in 1972; by 1977, however, shipments amounted to about $7 million 

 (fig. 22-70). 



^^Text under this heading is condensed from U.S. Department of Agriculture, Forest Service 

 (1956). 



