2784 



Chapter 23 



WATER — > -• 



i--CONSISTENCY (%) 



Figure 23-29.— Water balance of SI S fiberboard plant producing 1 00 tons of board per 

 day, ovendry-weight basis. (Drawing from Suchsland and Woodson 1985.) 



Three different wet forming machines are used in the industry: 



• Batch-type sheet mold 



• Continuous cyHnder machine 



• Fourdrinier machine 



Of these, the Fourdrinier machine is most important, and is exclusively used in 

 new installations. 



Batch-type sheet mold. — The discontinuous or batch-type wet- forming 

 process was developed by Ralph Chapman of Corvallis, Ore. in an effort to 

 produce fiberboard economically on a small scale. Two plants in the United 



