282 MANUFACTURE OF MILK POWDER 



The patent claims of the Just process cover the treatment 

 of the milk with calcic chloride (Ca O + Ca C1 2 ), or with the 

 double salt of sodium and calcium citrate, to reduce the acidity 

 of the milk, and with alkaline hypochlorite for the purpose of 

 preserving the fatty acids in the finished product, the heating 

 and boiling of the milk by bringing it in contact with a heating 

 surface of a temperature above 212 degrees F. and below 270 

 degrees F., allowing the thus treated and heated milk to flow 

 in regulated quantities on the surface of the steam heated re- 

 volving metal cylinders, where it is dried in the form of a film 

 and from which it is removed by mechanical scrapers. The 

 temperature of the heating surface on the cylinders is to exceed 

 212 degrees F. and to be below 270 degrees F. 



The high temperature to which the milk is heated obviously 

 reduces the solubility of the. finished powder. The purpose of 

 neutralizing the acidity of the milk, before drying, is to mini- 

 mize the solubility-destroying action of the high heat. 



The Hatmaker Process. This is similar to the Just process. 

 James R. Hatmaker of London, England, purchased the Just 



Pigf. 93. The Just-Hatmaker milk drier 



process for operation in Europe and later secured a patent of 

 his own, which represents a modification of the original Just 

 process, and which is known as the Just-Hatmaker process, 



