GROWTH AND UTILIZATION 



171 



on the other hand, are residues generally too small 

 for chipping, like sawdust, shavings, wood sub- 

 stance lost in barking, chipper rejects at pulp 

 mills, and veneer clippings. 



The character, quantity, or quality of these 

 residues may vary broadly from industry to in- 

 dustry and place to place, as may the opportunity 

 to use them. Considerable quantities of all kinds 

 are used as fuel. Lesser amounts are salvaged for 

 pulp, hardboard, or other fiber products, and for a 

 variety of other purposes including agriculture. 



Plant residues constitute a very large source of 

 wood. Although about three-fifths of the volume 

 is being used for one purpose or another, there are 

 opportunities for using much that remains and for 

 the use at higher levels of residues now being 

 burned as fuel. 



Quantity, Source, and Location 

 of Plant Residues 



Estimates of plant residues were developed for 

 all plants engaged in the primary manufacture of 

 logs and bolts in the United States and Coastal 

 Alaska. These plants included lumber mills and 

 integrated planing mills, veneer and plywood 

 plants, pulp mills,^" cooperage plants, small di- 



3* Plant residues at pulp mills relate only to wood losses 

 in storage and in preparing the wood for pulping. Addi- 

 tional losses of wood substance incurred in the various 

 pulping processes are excluded. 



mension and turnery plants, shingle mills, chemi- 

 cal and excelsior plants, and similar establish- 

 ments. In the aggregate, plant residues totaled 

 3.4 billion cubic feet in 1952 (table 106). This 

 volume, which was divided about evenly between 

 coarse and fine, was equal to about 38 percent of 



Table 106. — Plant residues in the United States 

 and Coastal Alaska, by kind oj material, and by 

 industry source, 1952 



Industry 



Total 



Coarse 



Fine 



Lumber ' 



Veneer 



Pulp 2 



Mil- 

 lion 

 cu. ft. 

 2, 950 

 205 

 170 

 40 

 49 



Per- 

 cent 

 86 

 6 

 5 

 1 

 2 



Mil- 

 lion 

 cu. ft. 

 1,466 

 67 

 82 

 23 

 23 



Mil- 

 lion 

 cu. ft. 

 1,484 

 138 

 88 



Cooperage. 



17 



Others 



26 



Total 



3,414 



100 



1,661 



1,753 



' Includes planing mills integrated with sawmills. 



- Plant residues at pulp mills relate only to wood losses 

 in storage and in preparing the wood for pulping. Addi- 

 tional losses of wood substance incurred in the various 

 pulping processes are excluded. 



3 Includes small dimension and turnery plants, shingle 

 mills, chemical and excelsior plants, and similar establish- 

 ments utilizing roundwood. 



SOURCE 



LUMBER 



SAWDUST 



SHAVINGS 



VENEER CLIPPINGS 

 OTHER FINE 

 MATERIAL 



SLABS, EDGINGS 

 TRIMMINGS, VENEER CORES 

 OTHER COARSE MATERIAL 



USE 



USED 

 FOR FUEL 



2.9 



0.2 

 0.2 

 0.1 



VENEER 



PULP 



OTHER 



USED FOR FIBER 



USED OTHERWISE 



NOT USED 



1.7 



0.1 

 0.2 



1.4 



Figure 68 



