Milk Powder 57 



powder to be more soluble. The milk is delivered 

 into the rolls from a distributing tank with an ad- 

 justable discharge. This tank is placed in the center 

 over and between the two rollers. The film of dried 

 milk is removed from the rolls by means of scrapers 

 and falls into receptacles. It has then to be placed 

 on porous racks in a dry kiln in order to dry it com- 

 pletely before it is ground. 



The Ekenberg process is a film drier operating 

 in a partial vacuum. The machine which does the 

 drying is called an exsiccator. It consists of a re- 

 volving steam-heated drum inclosed in a vacuum 

 chamber. The temperature of drying varies with 

 the steam pressure in the drum. It is claimed that 

 the drying takes place at a temperature of 100° to 

 120° F. The fact that the milk is dried in a vacuum 

 makes it possible to do it at a low temperature. The 

 milk is first partially condensed by being brought in 

 contact with the concave ends of the rolls. It is 

 then sprayed on the rolls and dried milk is removed 

 by a scraper. Next it falls into a receptacle. This 

 receptacle may be removed when full by means of a 

 special arrangement without breaking the vacuum 

 about the roll. 



The films of milk are placed on screen racks and 

 put in a dry kiln and held at a temperature of 90° F. 

 When completely dried the milk is ground and 

 packaged. It may be packed in various sized tin or 

 wood boxes or barrels. 



The Merrell-Soule is a spray process of drying. 

 The milk is first partly condensed in an ordinary 

 vacuum pan. Then by means of a pressure pump 

 it is forced into the drying chamber in the form of a 

 fine spray or mist. Air is filtered and blown over 

 radiators in an air-heating chamber and then into 

 the drying chamber. This dry hot air meets the 



