CONTINUOUS PROCESS EVAPORATORS 



137 



Description of Continuous Concentrator. The continuous 

 concentrator consists of a hollow copper drum. The copper shell 

 is surrounded by a steam jacket which is insulated. The space 

 between inner shell and jacket is about one inch. 



This drum carries 

 in its interior, a re- 

 volving dasher with 

 four or more blades, 

 according to the size 

 of the machine, and 

 similar to an ice cream 

 freezer or a flash pas- 

 teurizer. The edge of 

 these blades comes in 

 direct contact with the 

 inner surface of the 

 shell which is the heat- 

 ing surface, so that 

 when revolving, each 

 blade constantly re- 

 moves from the heating 

 surface any milk that 

 adheres to it. 



The blades are pres- 

 sed against the heating 

 surface by the centri- 

 fugal force that is 



generated when the machine is in motion. The arms to which 

 the blades are attached are equipped with stops that control 

 their pressure against the heating surface so as to insure con- 

 tinuous and uniform pressure. The shaft which carries the 

 dasher passes through the front and rear heads of the concen- 

 trator and carries a pulley back of the rear head, to which the 

 power is transmitted. 



The rear of the concentrator terminates in the exhaust 

 chamber of the condensed milk vapors, which escape through a 

 galvanized iron flue to the outside. The vapors are not condensed 

 by water, but escape into the atmosphere. The rear wall is 

 equipped with the intake of the fluid milk. In order to permit 



Fig. 52. The continuous concentrator 

 Courtesy of The Creamery Package Mfg. Co. 



