CONDENSED AND POWDERED MILK 461 



pan, area of heating surface, capacity of vacuum pump, and 

 amount and temperature of water in the condenser. In some 

 factories the condensed milk is superheated before it leaves 

 the vacuum pan by conducting live steam into it. In others 

 this part of the process is omitted. 



FIG. 87. Vacuum pan for condensing milk. 



The condensed milk with a specific gravity of about 1.06 to 

 1.09 is then cooled and filled into tin cans ; the cans are hermeti- 

 cally sealed and are now ready for the sterilizer. 



The sterilizer is a huge cylinder, heavily constructed and carry- 

 ing in its interior a revolving framework into which the cans are 

 placed and locked. In the sterilizer the cans are heated with 

 steam under pressure to temperatures varying from 226 F. to 

 240 F. according to the process employed, the condition of 



