Spray drying is one of the most widely used techniques for microencapsulation in the food and pharmaceutical industries. It is a fast and cost-effective process which produces dry powders from a fluid material by rapidly drying with a hot gas medium (usually air). This is the preferred technique for drying many thermal sensitive materials. The spray drying process consists of four parts: the atomization of the liquid feed, the drying of spray into drying gas, the formation of dry particles, and lastly, the separation and collection of the dry product from the drying gas. The figure below shows the relationship

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