Important factors causing mildew in feed production process

The problem of mildew in feed has always been one of the many problems surrounding feed manufacturers. In order to prevent the occurrence of mildew and ensure the quality of feed, various manufacturers have taken many effective measures and have achieved good results. The effect, the cause of mildew is affected by many factors, and the cause of mildew in the feed manufacturing process is only one of many factors.

In the actual production inventory, we found that occasional feeds in a short shelf life (10d ~ 20d), even in a shorter period of time there will be local mildew agglomeration, under the premise that other conditions are in line with the requirements (such as Moisture, mold inhibitors, environment, temperature, humidity, storage, etc., one of the sources of this mildew phenomenon is caused by imperfect development of the production process.

At present, the process of making pellet feed in most feed production plants is: after the cooler starts to be discharged, the cooled feed is raised to a certain height by a bucket elevator, and then discharged into the finished sieve to be sieved, and the sieve is sieved. The feed is divided into three different material layers through a two-stage sieve. The uppermost sieve is determined to be unqualified, the middle layer is a qualified finished product, the lowermost sieve is determined to be unqualified, and the qualified finished product flows into the finished product warehouse. package. The unqualified upper and lower layers of material will be collected and returned to the pelletizer for pelletizing feed. Through long-term observation, it is known that the problem of mildew caused by this process is on the material of the top sieve. We know that the powder passing through the granulator is strictly crushed and mixed, we know that it is passed. The powder of the granulator is subjected to strict pulverization and mixing, and the particle size is very small. After the ring granulation, the material flowing out through the ring die hole theoretically does not exceed the maximum size of the ring die. The material flowing out of the hole is theoretically not larger than the outer dimensions of the normal product of the ring mold. That is to say, under normal circumstances, the granulated feed is allowed to pass through the granules, and there will be no sifting objects (except for the extra long granules which are not cut off individually). In actual production, the uppermost sieve does have Some sieves are produced. By collecting these sieves for observation and analysis, it is not difficult to find that in addition to the individual ultra-long pellet feeds, it is mainly composed of the following two materials: 1 parts falling from the granulator to the grading sieve in each circulation device ( Such as washers, nuts, etc.); 2 is the high-moisturizing agglomerate that has fallen off from the granulator to the grading sieve, and the water casserole and the air damper, cooler, hoist and other feed processes formed on the casing Metamorphic agglomerate falling off in some dead angles in the equipment. Due to the long-term high temperature and moisture environment, the starch gelatinization rate is much higher than that of the normal pelletized feed, which creates favorable conditions for the reproduction of molds. When these pieces flow back to the granulator, they are again After granulation, all of them will enter the finished product, and once these high-moisture granules enter the finished packaging bag as a commodity, there will be two unfavorable factors. First, the particle color is significantly different from the normal finished product, and most of them have deteriorated. After feeding the animals, the adverse reactions are caused, resulting in damage to the corporate image and increased user input. Second, because the water content of these particles is generally much higher than that of normal qualified particles, and some have deteriorated, it is easy to induce in the short term. Mildew in the bag occurs. Due to the metabolism of microorganisms, once the mildew moisture will increase, the mildew of the feed will be accelerated, and the vitic circulation will cause the feed in the bag to be mildly mildewed in a short period of time.

In summary, the first type of material in the sieve on the sieving screen is mainly a metal component, which will block the ring mold after reflow, while the second type causes the feed quality to deteriorate, so both animal materials are It should not be returned to the granulator, but should be treated as waste.

Solution: Add a tee to the reflow chute of the topmost screen of the sieve, and treat the reflowed material separately in two cases: 1 If the pellet feed is produced, the sieve is directly connected through an outlet of the tee. Into a storage bin, (since the material is very small, it can be cleaned once a day); 2 If the broken feed is produced, the three-way is switched, so that the material on the sieve flows out through the other outlet of the tee, and enters the upper buffer of the crusher. Broken inside the warehouse. It has been found in practice that this method has a good effect on the mildew induced by the process and has a good effect.