Food & Ingredients June 2023

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Fig.4: Visibly different: REM-pictures of a fluidised bed spray granulation product (above) and the same product from a traditional spray tower. Fig.5: Cut granule with microencapsulated oil. Copyright: Glatt Copyright: Glatt Copyright: Glatt occur if the moisture suddenly escapes. Furthermore, depending on the drying speed and concentration of solids in the liquid, the particles might rupture, which makes them unsuitable for encapsulated actives. (Fig.5) Protecting active components Spray granulation also produces compact, round spheres with an onion-shaped structure by building up the product layer by layer. This enables flexible and complex product design as particles can be formed from different solid layers, with cores loaded and coated (Fig.6), giving nutraceutical manufacturers the opportunity to create functional products with added value. Furthermore, coating the previously spray granulated particles can be done with the same apparatus to protect the active component or mask unpleasant tastes and smells. Spray granulates differ from dried products in that particle size, shape and structure can be adjusted according to the desired application. Fluid bed spray granulation is recommended for sensitive nutraceuticals, for example, and for turning emulsions and oils into compact particles. As they have a smaller surface area compared with spray dried products, these nutraceuticals are better protected against oxidation and have a lower drying temperature. Glatt closely monitors every fluid bed project, from commission through to installation. Beyond the development of customised and functional product solutions, the company also offers project initiation, development and delivery to turnkey factories. Closed-circuit environment Multi-chamber fluidised bed systems can spray from above or below. Intermediate drying and cooling steps are also possible, and subsequent cooling can be done in the same unit. Fluidised bed spray granulation systems that handle organic solvents or oxidation-sensitive products can also be easily integrated into a closed-circuit environment. Copyright: Glatt A key difference between spray drying and fluidised bed spray granulation is particle size and morphology: in spray drying, particles dry from the outside in; while in fluidised-bed spray granulation, the particles dry from the inside out. The hot air stream in which the droplets dry creates a hard outer shell, which boosts the concentration of the dissolved component, yet the inner core of the particle remains liquid. As the temperature increases, this moisture evaporates and diffuses, causing hollow spheres. Indentations in the particles 24 FOOD & INGREDIENTS INTERNATIONAL JUNE 2023 Fig.6: The onion-shaped structure is clearly visible in these amino acid granules. Meet Glatt in Istanbul: Visit Glatt at the Food & Nutritional Ingredients in Istanbul from May 31 to June 2, 2023, hall10, booth D201. Don’t miss the lecture on “Spray Granulation vs. Spray Drying – Fluid Bed Technology as an Innovative Drying Process for Hydrolyzed Proteins?” on May 31, 16:45-17:15 local time by Dr. Jens Bergmann, Sales Manager Process Technology Food, Feed & Fine Chemicals, Glatt Ingenieurtechnik.
foodfeedfinechemicals.glatt.com Tailored enhancing of your ProducTs » Homogeneous and dust-free granules from powdery and liquid raw materials. » Drying and shaping in just one process step by fluidized bed and spouted bed technology. » Perfect determination of particle properties. » Maximum options for functionalization. » Protection of volatile and sensitive substances. » More performance, stability and safety for application, handling and storage. Glatt supports your product idea starting at the early stage of the product formulation and the process development to the scale up and the final production. Glatt. Integrated Process Solutions.
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