IGNOU BPVI 13 2026 - Explain the process of creaming and analyze the factor

Question

Explain the process of creaming and analyze the factors affecting the rate of creaming. Define creaming efficiency and describe the factors influencing creaming efficiency in dairy operations.

06 Mar 2026

Answer :

Word Count : 656

Creaming is the process by which fat globules present in milk rise to the surface due to the difference in density between milk fat and the surrounding aqueous phase. Milk is an emulsion in which fat globules are dispersed in skim milk. Since fat is lighter than water, the globules gradually move upward when milk is allowed to stand undisturbed. This natural separation leads to the formation of a cream layer at the top and skim milk at the bottom. In dairy processing, creaming may occur naturally by gravity or may be accelerated through mechanical means such as centrifugal cream separators. In traditional gravity creaming, milk is kept in shallow containers for several hours, allowing fat globules to rise slowly. In modern dairy plants, centrifugal separators rotate milk at high speed, creating a strong centrifugal force that separates the heavier skim milk from the lighter cream rapidly and efficiently. The rate of creaming depends on several physical and chemical factors related to milk composition and processing conditions. One of the most important factors is the size of fat globules. Larger fat globules rise faster than smaller ones because they experience greater buoyant force and less resistance during upward movement. Milk from different animal species or different stages of lactation may contain varying fat globule sizes, which

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