Management of dairy plants . e rings remove the water quickly,the thickness of the layer of water was reduced, and the eco-nomic efficiency of the machine increased about 50 per cent(Fig. 28.) 1 2. Burning of Milk Solids on Heating Surface. — Burned-onmilk is extremely poor in conductivity. It is therefore of muchimportance that all particles of burned-on milk are properlyremoved after each time the machine has been used. This isdone most readily by filling the machine with water and washingpowder immediately after pasteurization. By leaving thedasher revolving from ten to fifteen minutes it i
Management of dairy plants . e rings remove the water quickly,the thickness of the layer of water was reduced, and the eco-nomic efficiency of the machine increased about 50 per cent(Fig. 28.) 1 2. Burning of Milk Solids on Heating Surface. — Burned-onmilk is extremely poor in conductivity. It is therefore of muchimportance that all particles of burned-on milk are properlyremoved after each time the machine has been used. This isdone most readily by filling the machine with water and washingpowder immediately after pasteurization. By leaving thedasher revolving from ten to fifteen minutes it is quite easy toremove with a brush all milk particles adhering to the heatingsurface. A knife or any kind of metal should never be used forscraping the surface, as such tools will cause rough places andwhen the milk strikes such it will readily burn on. If anyamount of milk has burned on to the pasteurizer slacked limeand sal soda mixed in equal proportions will prove of greater » Bui. 43, Danish Experiment Station, Pjg. 24. — Pasteurizer with the Danish Experiment Station Improvements. PASTEURIZATION 155 efficiency than washing powder, but this should not be usedunless necessary, as it has a dissolving effect on the tin. Thefollowing are the most significant causes for milk burning onto the heating surface. A. Too Thin Metal. — As the copper wall becomes extremelythin the heat is conducted so readily through the wall that theheating surface becomes too hot. The albumin when strikingthis surface is coagulated and burns on. The increase in thethickness of the heating wall will represent a comparativelyslight decrease in efficiency. This decrease, however, is in-significant as compared to that caused by burned-on milk andas copper is so efficient as a thermal conductor it is advisableto have a copper wall of not less than one-twentieth of an inchin thickness. Copper of such thickness will not cause the milkto burn on readily and the pasteurizer, furthermore, becomes
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdairyin, bookyear1921
