<P> Gustaf de Laval's construction made it possible to start the largest separator factory in the world, Alfa Laval AB . The milk separator represented a significant industrial breakthrough in Sweden . Within the first decade of the 1900s, there were over twenty separator manufacturers in Stockholm . Separators in modified form are also used on ships to purify oil, which may have been their original use, because in its original form de Laval proposed the separator for use in his steam turbine . De Laval's turbine used mechanically lubricated journal bearings which weren't insulated from the inside of the turbine . When the steam condensed into water it contaminated the oil . To purify the oil a centrifugal separator was used, which was later adapted to the dairy industry . </P> <P> The original design had a manual bowl that required manual cleaning . Most modern separators use a self - ejecting centrifuge bowl that can automatically discharge any sedimentary solids that may be present, and that allow for clean - in - place (CIP). </P> <P> A distinction is made between warm milk skimming and cold milk skimming: </P> <Ul> <Li> Warm milk skimming separator: At first the raw milk is heated and then skimmed warm . There is a significant difference in density between cream and skimmed milk, because of the higher temperature . </Li> <Li> Cold milk skimming separator: Because of the lower energy, which is used, the production cost will be reduced . Also at cold temperatures, the growth of microorganisms is significantly reduced . In the USA, Mexico, Australia and New Zealand, cold milk skimming is on the rise . </Li> </Ul>

How is cream separated from from milk in dairy processing