Understanding Commercial Spray Drying

By definition, spray drying is the transformation of feed from a fluid state into a dried state by spraying the feed into a hot medium. The type of feed can be a solution, suspension or paste which can be transformed Tech Presents For Men into powders, granules, or agglomerates. The form that the finished product takes is dependent on many factors, including the physical and chemical properties of the feed and the design and operation of the dryer.
Spray drying is a very flexible process that can meet the strict product requirements of food and pharmaceutical products, offering a low-cost solution to many drying problems. Spray drying can solve drying problems related to thermally sensitive materials such as food ingredients and flavors. Spray dried products retain the nutritional value of the feedstock (ingredients), while offering a material that can be used directly in a final composition, or can be readily mixed or reconstituted.
By changing the operating conditions of a spray dryer, differences in physical characteristics can be achieved. Atomization is the use of some form of energy to create small droplets of the feed stock. There are several types of feeding systems used to atomize the feed product. The most common atomization techniques are a high pressure nozzle, rotary atomization and two-fluid atomization. In all cases, the degree of atomization can be changed to either increase or decrease the droplet size of the feed. The size of the droplet directly correlates to the particle size of the finished product in the case of manufacturing powders. By varying the degree of atomization a wide range of particle sizes can be produced.
Why is Particle Size Important?
End product’s particle size is very critical in its applications within the food industry. The mouth feel of a finished product or the segregation of a blend can be significantly impacted by the particle size of the dried product.
Can Spray-Drying be Used to Combine Ingredients?
The agglomeration or combining of smaller particles can be done in certain spray dryer designs. The agglomeration process creates a product that is more soluble and handles better than the powder Dangers Of Technology Essay version of the same product. Chemically and nutritionally the materials are equals, but the agglomerate has a larger surface area per volume giving it a better propensity for dissolving.
How are carrier systems used?
Products that were once not able to be dried, due to their physical nature, are able to be dried by developing a system that is designed to “carry” the product. For example, oils used in flavorings are able to be delivered in a dry form by the creation of an emulsion of the oil and other carrier products. These emulsions are specifically designed based on the end use of the product and the material to be dried. The ability to understand the customer’s final requirement and design a product that meets these criteria is critical in developing new products.

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