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Cream separators help people to get the cream and skim milk quickly and preserve perishable dairy products, especially in hot seasons. Low-fat cream immediately is used for food. But the cream, fat content of which is 30-40%, is used to get butter (fat content 80%) by means of kneading.
However, milk contains fat in relatively small quantities, in the form of tiny balls that are the size of several microns, and separating them from the total mass is not easy.