Technology for producing microcapsule powder flavor by high speed centrifugal spray drying
In the production of powder flavor, if the temperature of the core is too high, the volatilization of the core material is enhanced, which may cause cracking of the dried microcapsules, resulting in a decrease in the embedding rate. The essence produced, for some wall materials, too high temperature will denature the wall material, reduce its solubility, affect the permeability, and also reduce the product density, increase the specific surface area, the fragrance of the fragrance is poor, and it is not good for the product.
If the powdered air is produced at the same time, the outlet air temperature is low, which will cause the core material to be volatilized and enhanced. At the same time, the product has a high moisture content, which causes serious wall smearing. The high air temperature is beneficial to reduce the drying time of the product particles. Rapid formation of a complete and dense microcapsule structure can also reduce the moisture content of the product; however, if the outlet temperature is too high, the microcapsules will be overheated and cracked, the product quality will be lowered, and the fragrance effect will not be good.
When the microcapsule powder flavor is produced by spray drying method, the product quality is affected by the above factors, and is also affected by the specific conditions such as wind speed and equipment. It is necessary to comprehensively consider various factors and select appropriate conditions to obtain high quality products. .
Spray drying is a microcapsule technology commonly used in the food industry. At present, more than 90% of the products in the market use this method. It is suitable for microencapsulation of lipophilic liquid materials. The stronger the water repellency of the core material, the better the embedding effect; since the wall material is soluble in water, the wall material after rehydration is immediately dissolved, and the core material is immediately dissolved. freed. The specific advantages and disadvantages of the spray dryer are as follows:
1. Advantages of spray dryer: high drying rate, short time, low material temperature, suitable for drying of heat-sensitive substances; purity of product, good solubility; strong adaptability of equipment used, good quality of flavor, The cost is low; the production process is simple, environmentally friendly, no waste water, waste generation, convenient operation and control, and easy to realize large-scale industrial production.
2. Disadvantages of spray dryer: The quality of the fragrance is not well controlled, the heat consumption per unit product is large, the thermal efficiency of the equipment is low, the medium consumption is large, the power consumption is large (including heat energy and electric energy); the size of the spray dryer is larger. The capital cost is high; the product usually has a small particle size and high solubility, but the fluidity is poor, and there may be difficulty in dispersion when dry; when the amount of embedding is large, the embedding rate is not high: the core material may remain on the surface of the microcapsule, so There is a possibility of being oxidized, and after oxidation, the product may be odorous.
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