302 



MANUFACTURE OF MILK POWDER 



It is superior in this respect to the fine state of division of the 

 product of other processes, in which state the particles are more 

 difficult of mixture and solution, though they may be equally 

 soluble. 



Gray patent No. 1,266,013 deviates in principle from No. 

 1,157,935, in that the liquid to be desiccated is distributed on a 

 desiccating supporting surface, and the dried milk is removed 

 from this surface in finely divided form. The operation is made 

 continuous by causing the spraying or depositing devices to 

 travel in unison with the devices for removing the dried material, 

 but so as to deposit the liquid on the supporting surface after the 

 same has been cleaned of the dried substance. 



The d e s i c c ating 

 chamber is of large 

 size and cone-shape. 

 The inclined or taper- 

 ing sides A form the 

 supporting surface. It 

 terminates at its bot- 

 tom in a suitable dis- 

 charge opening B, reg- 

 ulated by a valve b. At 

 the top in the center 

 there is an exit C for 

 the moisture-laden air, 

 and peripheral inlet 

 openings D for the 

 heated air, similar as in 

 the apparatus of the 

 two previous patents, 

 and so arranged as to 

 create in the drying 

 chamber a cyclonic 

 action, whereby any 

 particles heavier than * 106 ' ^e Gray milk drier 



the air are caused to seek the walls of the chamber and be 

 deposited thereon. In the center of the upper portion of the 

 drying chamber is a rotary spray nozzle F, arranged to direct 

 the milk in a fan-shaped spray against the inclined wall A. The 



