Seven factors causing mildew in feed processing
1, the pellets are curved and show many cracks on one side.
This phenomenon is usually produced when the pellets leave the ring mold. In production, when the position of the cutter is adjusted far from the surface of the ring mold and the edge is blunt, the particles are broken or torn by the cutter instead of being cut when being extruded from the die hole. There are many cracks on one side and the other side. Such pellets tend to break from these cracks as they enter the cooler for cooling or transportation, resulting in excess pellets produced.
Improvement method:
a) increase the compression force of the ring mold on the feed, that is, increase the compression ratio of the ring mold, thereby increasing the density and hardness value of the granular material;
b) The feed ingredients are pulverized more finely. If molasses or fat is added, the uniformity of molasses or fat should be improved and the amount added should be controlled to increase the compactness of the granules and prevent the feed from becoming soft;
c) adjust the distance of the cutter from the surface of the ring mold. Usually, the distance from the outer edge of the cutter to the outer surface of the ring mold is not greater than the diameter of the feed pellets produced, or the sharper cutting blade can be replaced. For small diameter pellets, it can also be used. Thin blade and make the thin blade close to the surface of the ring mold;
d) The use of a bonding granulation aid helps to improve the bonding force inside the particles.
2, horizontal cracks across the entire pellets
Similar to the phenomenon in Case 1, the crack occurs in the cross section of the particle, except that the particle is not bent. This can happen when granulating fluffy feeds containing more fiber. Such pellets tend to be granules in the cross-section of the cross-section due to the expansion of the fibers when the pellets are extruded into the granulation pores of the ring mold. Produces a bark-like appearance of the feed.
The improvement method is
Increase the compression force of the ring mold on the feed, that is, increase the compression ratio of the ring mold;
Control the fineness of the fiber, its maximum length can not exceed one-third of the particle size;
Reduce production to reduce the speed of feed through the die hole, increase the density;
Lengthening and tempering time, using multi-layer conditioner or kettle conditioner;
When the water content of the powder is too high or contains urea, it is also possible to produce the appearance of the bark-like feed, and the added water and urea content should be controlled.
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