MANUFACTURE OF MILK POWDER 



281 



the drying" drums are incased in a vacuum chamber and the 

 drying is accomplished under reduced pressure. Some of the 

 U. S. patents of tlie film-drying process that have found wide 

 commercial application are described below. 



The Just Process. This process appears to be the first of 

 its type that found wide application in the desiccating of milk. 

 Tt was invented and patented by John A. Just of Syracuse, New 

 York, U. S. patent No. 712,545, November 4, 1902. 



Fig 1 . 92. The Just milk drier 



The essential equipment involved in the Just process con- 

 sists of two horizontal steam-heated revolving metal cylinders. 

 These cylinders are installed sufficiently close to each other so 

 that 'there is contact at their periphery. A milk destributing tank 

 (7) with adjustable discharge (8 and 9) in the center over and 

 between the two cylinders. Scrapers or knives (11) which re- 

 move the dried film of milk from the cylinders; and receptacles 

 (12) which receive the finished powder. 



