PASTEURIZING MILK. 



9 



crates of raw milk are placed on an endless traveling conveyor which 

 passes through the machine and returns under it. The bottom of 

 the machine is divided into several compartments and each compart- 

 ment is filled with water for supplying the machine when in oper- 

 ation. The top of the machine is a flooding pan divided into com- 

 partments corresponding to those in the bottom of the machine. 

 Pumps draw the water from the lower compartments and force it 

 into the corresponding top sections, from which it returns in the form 

 of a shower through perforated bottoms. The process is repeated 

 with the same water. As the crates of milk pass through the machine 

 they pass through showers of water at different temperatures and 

 are heated to the pasteurizing temperature, then held and finally 



Fig. 4. 



-Another type of continuous machine in which the bottles of milk have ordinary 

 caps and are passed through showers of water at various temperatures. 



cooled. The tops of the bottles are protected from water by metal 

 caps arranged as shown in figure 5. This frame of metal caps covers 

 the top of each bottle in the crate. 



The pasteurizing section of the machine is located in the center 

 with the preheating and cooling section at each end. The preheating 

 and cooling sections are connected by channels, because the cool milk 

 entering the machine has a tendency to cool the water and the hot 

 milk emerging from the pasteurizing section has a tendency to heat 

 94289°— 15 2 



