12 



BULLETIN 80, U. S. DEPARTMENT OP AGRICULTURE. 



ing the first hour of cooking. The room temperature and the pres- 

 sure of steam at digester inlet were kept as near constant as possible 

 for all the tests, so that all conditions affecting condensation, aside 

 from the cooking operation itself, would be uniform. For the same 



| STEAM MAINl I ALKALI STORAGE TANK~| | STORAGE CANS~] | WATER MAIN 1 



CAUSTIC SODA LIQUOR 



STEAM SEPARATOR | 



WATER 



CHIPS 



SAMPLE A 



1 LIQUOR PREHEATER 



CAUSTIC SODA AND WATER 



SCALES I 



CHIP CHARGE 



DIGESTER 



RELIEF LIQUOR 



BLOW PIT 



'AMI' 



BLACK LIQUOR 



BLACK LIQUOR 



| BLACK LIQUOR TANK 



PRESS 



LEACHEJp 



BLACK LIQUOR 



DRAWINGS 



PRESSED PULP 



1 SHREDDER 1 



SHREDDED PULP 

 f SCALES 

 SHREDDED PULP 



SAMPLE D 



BEATER 

 T 



CRUDE PULP AND WATER 



CENTRIFUGAL PUMP 



CRUDE PULP AND WATER 



STOCK TANK 



CRUDE PULp! AND WATER 



SCREEN 



SCREENINGS AND WATER SCREENED PUL P AND WATER 



WATER EXTRACTOR | | WATER EXTRACTOR 



SCREENINGS 



| SCALES 



SCREENINGS 



WATER WATER 



SAMPLE E 



WASTE 



SEWER 



PULP AND WATER 



STUFF CHEST" 

 1 



PULP AND WATER 



| MACHINE SCREEN 1 



PULP AND WATER DIRT AND SCREENING* 



PAPER MACHINE 



WASTE 



WATER 



DRY PULP IN ROLLS 

 UNBLEACHED 



Fig. 2.— Flow sheet, showing course of material through the various stages of treatment and testing. 



reason, steam of approximately the same moisture content was used 

 in all tests. 



During the first hour of cooking the digester pressure and tempera- 

 ture were brought, at a uniform rate, up to the maximum to be 



