Condensed Milk and Milk Powder 73 



to twenty minutes before any cold water is turned into the tank. 

 After that, cold water is turned in slowly until the temperature of 

 the milk has fallen to about 70 degrees F. The entire time of cool- 

 ing should last about two hours. The 

 cans should revolve slowly, rapid stirring 

 enhances the precipitation of sugar crys- 

 tals. In order to scrape the sides of the 

 cans efficiently, when the cans revolve 

 slowly, (about five revolutions per min- 

 ute) it is advisable to use two paddles in 

 each can, scraping the cans at opposite 

 sides. When the milk is sufficiently 

 cooled the cans are stopped, the paddles 

 lifted out, scraped and removed, and the 

 cans taken out of the tank. 



In some factories, the condensed 



.... , , r , Fig. 22. Cooling tank for 



milk is transterred from the pan direct sweetened condensed milk 

 into large tanks and is subsequently c »»"««' A "^H.rr. s4 c. 

 cooled by pumping it through a series, of coils submerged in cold 

 water. This method is labor and time-saving and the objectionable 

 features of agitation are avoided. On the other hand, there is dan- 

 ger of too rapid chilling which tends toward excessive sugar crystal- 

 lization and the production of rough, sandy and settled milk. 



CHAPTER VII 



FILLING 



The sweetened condensed milk is put on the market in barrels 

 and in hermetically sealed tin cans. 



In Barrels. — Barrels-, similar to glucose barrels, are generally 

 used. They hold from three hundred to seven hundred pounds of 

 condensed milk. New barrels should be used for this purpose. 

 Barrels paraffined on the inside are most satisfactory, as they are 

 more apt to be free from mold spores. Old glucose barrels are 

 dangerous to use, as they often contain decaying remnants of glu- 

 cose, which cause the condensed milk to ferment. The new barrels 

 are steamed out and drained thoroughly. The filling is facilitated 

 by the use of a large galvanized iron funnel with a discharge one 



