CONTINUOUS PROCESS EVAPORATORS 



175 



Construction. The Ruff Condensing Evaporator consists 

 of the follow- 

 ing, three main 

 parts : 



1. A vat or 

 tank holding 

 the milk to be 

 condensed, and 

 equipped with 

 cover. The 

 body of this 

 tank is of steel 

 sheathing, lin- 

 ed on the inside 

 with tinned 

 copper. The 

 cover or top is 

 fitted with 

 doors. 



2. One or 

 more s t e a m- 

 heated hollow 



cylinders which revolve in the tank horizontally. These cylin- 

 ders are constructed of special steel, highly polished. They are 

 equipped with tinned bronze scrapers which remove the film of 

 milk from the heating surface. The cylinders are fitted with 

 a device for the automatic removal of the condensed steam, facil- 

 itating the continuous heating with dry steam and therby in- 

 hancing the rapidity of evaporation and augmenting the capacity 

 of the machine. 



3. An arrangement for blowing atmospheric air into the 

 lower part of the tank, causing it to rise up through the milk 

 and to escape from the tank. 



4. Accessories. The entire unit further comprises such 

 accessories as a dial thermometer, high pressure blower with 

 pipe connections from fan to evaporator and .automatic return 

 boiler feed pump, complete. 



Operation. The milk is preheated to 145 degrees F. The 

 hot milk runs into the tank by gravity, or is pumped in. In the 



Fig*. 76. The Buff condensing 1 evaporator 



Courtesy of The Cream Production Co. 



