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How to prevent mildew in feed production process
The cause of moldy mildew is affected by many factors, and it is just one of many factors that cause moldy changes in the manufacturing process of feed. In the actual production inventory, we found that occasional feeds had a period of mild preservation (10d to 20d) within a short shelf-life, even during a shorter period of time, with the occurrence of local mildew-caking, and other conditions were met (such as moisture , anti-mold agent, environment, temperature, humidity, storage, etc.) One of the sources of this mildew phenomenon is caused by imperfect production process. At present, most feed production plants produce pellet feeds with the following process: After the chiller begins to feed, the cooled feed is lifted to a certain height by a bucket elevator, and then discharged into a finished sifting screen for sifting. The two-step screen divides the feed into 3 different layers. The top layer is defined as unqualified, the middle layer is qualified, and the bottom layer is unqualified. Qualified products flow into the finished product and are to be packed. . Unqualified upper and lower two layers of material will be collected and returned to the granulator for pelleting feed. Through long-term observation, it has been concluded that the problem of mildew caused by this process lies in the material sieved on the top layer. We know that the powder passed through the granulator is strictly crushed and mixed and screened. The particle size is very small. After being pelletized by the ring die, the theoretical size of the material flowing out through the ring die hole will theoretically be no larger than the normal size of the ring die. In other words, under normal circumstances, the grading screen allows all particle feeds to pass, and no screened material will be generated (except for occasional uncut long particles). In actual production, the uppermost screen actually does Some sieves are produced. It is not difficult to find through the observation and analysis of these sieves that, apart from the individual long pellet feeds, it is mainly composed of the following two materials: 1 Parts that fall from the granulator down to the circulation equipment in the classification screen. (such as washers, nuts, etc.); 2 is the high-moisture pellets that are detached from the circulation parts in the granulator to the classifying screen, and the water boilers, winders, coolers, hoists and other feeds formed on the shell. Deterioration of agglomerate material accumulated in some dead space within process equipment. Because of the long-term high-temperature moisture environment of these materials, the gelatinization rate of starch is much higher than that of normal pellet feeds. This creates favorable conditions for the reproduction of molds. When these pellets flow back to the granulator, they are again reconstituted. After granulation, they all go into the finished product. Once these high-moisture granules enter the finished packaging bag as a commodity, there will be two unfavorable factors. First, there is a clear difference between the color of the granules and the normal finished products, and most of them have deteriorated. After animals are fed, adverse reactions occur, resulting in the loss of corporate image and increase in user complaints. Second, since these pellets generally have much higher water content than normal certified pellets, and some have deteriorated, it is easy to induce pockets in the short term. The mildew occurs within the mold. As a result of the metabolism of microorganisms, once moldy water increases, it will speed up the mildew of the feed. Under a vicious cycle, it will cause mild local mildew in the short term. In summary, the first type of material in the screen on the sieving screen is mainly metal components, which will block the ring mold after reflow, and the second type of material will cause deterioration of the feed quality, so these two kinds of screen materials Neither should go back to the granulator. Instead, it should be treated as a waste residue. Solution: Add a tee on the return pipe of the top sieve mesh screen to separate the reflux material in two cases: (1) If pellet feed is produced, connect the screen directly through an outlet of the three links. In a storage box, (because the material is very few, it can be cleaned once a day); 2 If the broken feed is produced, the three links will be switched so that the materials on the screen will flow out through another outlet of the three-way and enter the upper buffer of the crusher. Inside again broken. It has been found through practice that this method can inhibit the mildew caused by the process and have a good anti-mildew effect.