The mildew problem of feed has been one of the many problems that have plagued feed manufacturers. In order to prevent the occurrence of mildew and ensure the quality of feed, various manufacturers have taken many effective measures and achieved good results. The effect of mildew is due to many factors, and it is only one of many factors that cause moldy mildew in the manufacturing process of feed. In actual production inventories, 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, and there was a phenomenon of local mildew-caking, and other conditions met the requirements (such as Moisture, mildew-proof agent, environment, temperature, humidity, storage, etc.) One of the sources of this mildew phenomenon is caused by imperfect production process. At present, the majority of feed production plants use granular pellets in the following process: After the coolers are started to feed, the cooled feed is lifted to a certain height by a bucket elevator, and then discharged into the finished grader for screening. The feed is divided into 3 different layers through a two-step screen. The uppermost screen is rated as unqualified, the middle layer is qualified, and the lowest screen is unqualified. Qualified products flow into the finished product. package. Unqualified upper and lower two layers of material will be collected and returned to the granulator for granulation 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 we know that The powder of the granulator is strictly crushed and mixed, and the treated particles have small particle diameters. After being pelletized by the ring die, the maximum size of the material flowing out through the ring die hole is theoretically no larger than the ring die. Theoretically speaking, the maximum size of the material flowing out of the hole will not be greater than the normal size of the ring mold. 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 observation and analysis that these sieves are collected that apart from the individual long pellet feeds, it is mainly composed of the following two materials: parts that fall off 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 pelletizing machine to the grading screens, and the various feed processing equipment such as water boilers and winders, coolers, and hoists formed on the cabinet. The metamorphic agglomerate material accumulated in some dead corners. Due to the long-term high temperature moisture environment, these materials have a much higher starch gelatinization rate than normal pellet feeds. This creates favorable conditions for the reproduction of molds. When these pellets flow back to the granulator, they are again After granulation, all of them will enter 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 been deteriorated. After feeding the animal, it will produce bad reflection, which will cause the corporate image to be damaged and the user's investment will increase. Second, since the moisture content of these particles is generally much higher than normal qualified particles, and some of them have been degraded, it is easy to induce in a short time. The mildew in the bag will occur due to the metabolism of microorganisms. Once moldy water will increase, it will accelerate the mildew of the feed. Under a vicious circle, it will cause mild local mildew in the bag feed within a short period of time. In summary, the first type of material in the screen on the sizing screen is mainly metal elements, which will block the ring mold after reflow, and the second type will cause feed quality deterioration, so both animal materials are Should not return to the granulator, but should be treated as waste residue. Solution: Add a tee on the return chute of the uppermost sieve mesh to separate the reflux material in two cases: 1 If pellet feed is produced, connect the sieve directly through an outlet of the tee. Into a storage box, (because the material is very small, 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, into the upper buffer of the crusher. The warehouse is broken again. It has been found through practice that this method can inhibit the mildew caused by the process and receive good results.
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