Condensed Mii<k and MiivK Powder 



89 



which are liable to pass into the finished product alive, in spite of 

 the sterilizing process, causing the goods to be a complete loss, due 

 to subsequent fermentation. 



CHAPTER XI 



COOLING 



In the cooling of the evaporated milk, no attention need be paid 

 to sugar crystallization. In this class of goods. there is plenty of 

 water to keep the milk sugar in ready solution. The evaporated milk 

 can, therefore, be cooled as rapidly as facilities permit. The cooling 

 may be accomplished in similar ways as are used for cooling fresh 

 milk. From the homogenizer the evaporated milk is run over a sur- 

 face cooler, or cooling coil. It is advisable to cover the coils with 



a jacket of galvanized iron, tin or 

 copper, so as to avoid undue con- 

 tamination of the milk from dust, 

 flies, and other undesirable agents. 

 In some condenseries, the hot evap- 

 orated milk is forced through dou- 

 ble pipes, cold water passing be- 

 tween the inner and outer pipe, or 

 the coils through which the milk 

 passes are submerged in a tank of 

 cold water. The only objection to 

 this system is that the pipes are more difficult to clean than in the 

 case of an open surface cooler. Where this system is used, the pipes 

 should be equipped with sanitary fittings so that they can be readily 

 swabbed out from both ends. In other factories, the same cooling 

 equipment is used as for sweetened condensed milk, with the excep- 

 tion that cold water is run into the cooling tank at once. If the 

 evaporated milk is not homogenized it should be cooled as soon as it 

 leaves the vacuum pan. 



The evaporated milk should be cooled to as low a temperature 

 as the available water permits. If the condensery is not in position 

 to fill the avaporated milk into tin cans immediately after cooling, it 

 is advisable to place the covers on the 40-quart cans and submerge 

 them in cold 'or ice water. Condenseries which are provided with 



Fig:. 34. 



Surface cooler for evaporated milk 



Courtesy of Arthur Harris & Co. 



