Conditioning Of Feed Powder

June 27, 2019

Conditioning is the wet heat treatment of feed powder (add a certain amount of steam) to make part of the starch gelatinization (because water and temperature are not enough, so only a small part can gelatinization), protein denaturation, material softening, in order to improve the efficiency of the pelletizer and pellet feed quality. It can improve the stability, palatability and digestibility of feed. Starch gelatinization has three conditions: temperature, moisture and time. The gelatinization temperature of grain is generally above 80 degrees Celsius. Too low moisture content is not conducive to gelatinization. Increasing pressure can shorten the gelatinization time. Conditioning and feed of granulating when high temperature can kill the harmful bacteria such as e. coli, salmonella, can improve the storage performance of the product and is beneficial to the health of the animals. During conditioning, the added amount of steam is generally in the range of 3~5%, (the moisture of powder is generally in the range of 12~14%, and about 17% after adding steam). Too much water will make the material thin and unable to bear pressure. According to the time experience has shown that using should be saturated steam, the steam temperature is high, it less water. With saturated steam conditioning, the temperature can be increased by 11 degrees for each 1 % moisture increase in the powder. Since saturated steam is a superheated dry steam, contains less moisture, has a great amount of latent heat. When the water vapor of 100 degrees changes into hot water of 100 degrees, the latent heat released is 2258.2 kJ/kg, which can help the material raise the temperature of the material. Generally, the conditioning time of powder in a single-layer modulator is about 12~20 seconds. Increasing the length and number of layers of the modulator or using a double-axis differential quencher can extend the modulation time and improve the degree of gelatinization and particle quality. This has very good effect on improving water resistance of aquatic feed.

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