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EVAPORATED MI^K HOMOGENIZING 



vided very minutely. This type of homogenizer has not been 

 used much as yet in the manufacture of evaporated milk and 

 but little is known concerning its effect on this product. 



In the Progress homogenizer the homogenizing principle 

 consists of forcing the milk, by means of single acting pumps, 

 between a series of discs with ground surfaces. The discs lay 

 flat one upon the other, they are enclosed in a cylinder and are 



Fig. 39. The Gaulin homogenizer 

 Courtesy of Creamery Package Mfg. Company 



held in place by a rod running through their center. The discs 

 are pressed against each other by a heavy spiral screw, which 

 regulates the pressure to which the milk is subjected. The milk 

 passes from the center to the periphery of the discs. While being 

 forced through the discs the fat globules are split up very finely. 

 The discs used in this machine are of two types. One type has 

 very fine irregular grooves. The milk shoots through these 

 grooves against hard shoulders. The other type of discs has 

 smooth surfaces but their area of contact is narrow. The milk 

 passes through between these smooth surfaces. 



