Raw material factor
Raw material factors directly affect the effect of granulation, the starch content of the material is easy to steam paste, these raw materials after tempering, there is a certain viscosity, conducive to particle forming. For raw materials with high crude fiber content, add a certain amount of grease, can reduce the friction between the material and the ring mold during granulation, which is conducive to the material through the ring mold, and the appearance of the particles after shaping is smoother. Generally add about 1%, add too much, easy to cause loose particles, if you need to add more oil, you can consider spraying after granulation, especially for the production of high-energy feed. Crushed raw material particle size determines the surface area of the feed composition, the finer the particle size, the larger the surface area, the faster the material absorbs moisture in the steam, conducive to material conditioning, but also easy to make granulation molding. From the point of view of granulation, crushing fine, granulation strength is high, but add more steam, a little inattention is easy to plug the machine, and the raw material is crushed too fine, resulting in crushing power consumption is too high. Particle size is too coarse, increase the ring die and pressure stick wear and tear, granulation forming difficulties, especially small aperture ring die forming more difficult, and cause the material paste effect is poor, resulting in high consumption, low output, particles containing powder rate is high. Therefore, the production of livestock and poultry feed, crushed corn should be used 2.5 ~ 3.0mm sieve plate, that is, to avoid the disadvantages of particle size is too fine, but also to ensure that the feed is fully tempered by the required particle size, which is conducive to reducing the particles of the powder rate. In addition to pay attention to the mixing uniformity before granulation, because the feed formula is complex, the proportion of various raw materials varies greatly, for different formulas, different varieties, the use of different mixing time, so that the mixing uniformity coefficient of variation of about 5%.
