MANUFACTURE: OF MILK POWDER 



293 



In this apparatus the spray of the milk enters into the upper 

 part of the drying chamber and is permitted to drop through an 

 atmosphere of heated air. As the atoms of drying milk descend,- 

 they surrender more and more of their moisture and at a certain point 

 toward the bottom they have discharged substantially all their mois- 



Pig-. 100. The McLachlan milk drier 



ture and are deposited in the form of a dry powder in the bottom 

 of the drying chamber, from where they are discharged by a slide 

 door. In the meantime the vapors pass freely up and out of the 

 upper or open end of the chamber. 



This process differs from the Stauf process essentially only in 

 the fact that the milk descends through an atmosphere of heated air 

 and that the drying chamber and the collecting chamber are one and 



