Effect of moisture on particle durability and powder rate
Due to the obvious seasonal differences in feed moisture, this difference leads to seasonal changes in feed production and feed pellet quality. There is a significant correlation between the moisture content of the feed and the granulation efficiency. The moisture in the feed can reduce the dust during the crushing and mixing of the feed. feed starch is the primary factor affecting the quality of feed pellets. The process of starch gelatinization can be divided into three stages:
(1) Reversible water absorption stage, moisture enters the amorphous part of the starch granules, and the volume expands slightly. At this time, the particles are cooled and dried, the particles can be recovered, and the phenomenon of birefringence is unchanged;
(2) Irreversible water absorption stage, as the temperature rises, water enters the gap of starch crystallites, irreversibly absorbs a large amount of water, and the phenomenon of birefringence gradually blurs and disappears. It is also called “dissolution†of crystals, and the starch granules swell to the original volume of 50-100. Times;
(3) The starch granules finally disintegrate, and the starch molecules all enter the solution. It can be seen from the above process that proper moisture facilitates the penetration of hot steam into the interior of the feed pellets and increases the gelatinization rate of the starch (see Table 1). The moisture content of the feed is too low to affect the gelatinization of the starch and the quality of the pellets. The powder rate of pelleted feed will increase significantly, and customer complaints will increase. The feed mill mainly increases the pellet quality by increasing the compression ratio of the slip film, but the unit energy consumption and production efficiency are significantly reduced. Maintaining proper moisture in the feed can increase the persistence of the feed pellets and reduce the chalk content (see Figure 2 and Table 2).
Table 1. Effect of moisture on starch gelatinization degree
Figure 2. Effect of added moisture on particle persistence
Table 2. Effect of adding water before granulation on the durability and powder content of pellet feeds
Effect of feed moisture on water time of aquatic feeds
Aquatic feed has high requirements on water dissolution time. If the water is dissolved for a short time after feeding, the fish can not be completely fed, which will result in serious waste of feed and high feed coefficient. The water dissolution time of the feed has a direct relationship with the gelatinization degree of the starch. The best binder in the aquatic feed is the secondary powder. The degree of gelatinization of the secondary powder has a direct influence on the water dissolution time of the feed, from gelatinization. In the process, water is required to participate, but the fish feed is mainly composed of protein feed such as soybean meal, fish meal, cotton aphid, rapeseed meal and other low-fat feed components. Starch gelatinization is difficult. In order to achieve the purpose of increasing the water dissolution time, In the production process, high compression ratio slip film granulation is required, so the power cost and mechanical cost of producing fish feed are high. Properly increasing the moisture in the fish feed can increase the gelatinization degree of the starch and effectively increase the water dissolution time of the feed.
There is a direct relationship between feed pellet quality and feed moisture, but the moisture content of feed ingredients has obvious seasonal changes. How to improve the quality of feed in the season when feed ingredients have lower moisture and higher temperature is something that every feed enterprise needs to consider. problem. The focus of the problem is the moisture problem of the feed in the mixer, so some feed mills want to increase the moisture of the finished product by spraying water in the mixer, but this is very dangerous because the added water is free water, which is present in The surface of the feed forms tiny water droplets. When the temperature is high, the water will be emitted, and the water droplets will form in the inner membrane of the feed bag, which will cause local mildew in the feed. This is also the main reason for the mildew of feed in the hot season of the feed mill. one. The growth of mold leads to an increase in the feed mycotoxins, which directly affects the animal's production performance. Therefore, it is of great significance to find a product that can effectively increase the moisture content of the pellet feed and prevent the mildew of the feed.
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