In the production of granulating machine pellets, sometimes irregularly shaped pellets may occur, and experienced feed manufacturers will know what the cause of the situation is and can be quickly eliminated, for inexperienced or new feed production. Manufacturers, sometimes can not find the crux of the problem, only ask the outside world or the help of the granulator manufacturer. The following are the reasons and improvement methods for the seven common abnormal material particles. This is the author's work experience in the development and commissioning of granulators for many years, for comparison and reference in feed production. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

1. The pellets are bent and show many cracks on one side. ESr China Feed Industry Information Network - Based on feed, serving animal husbandry

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. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

Improvement method: ESr China Feed Industry Information Network - based on feed, serving animal husbandry

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 pellets ; ESr China Feed Industry Information Network - based on feed, serving animal husbandry

b) crush the feed ingredients to a finer size. 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 pellets and prevent the feed from becoming soft. ESr China Feed Industry Information Net - based on feed, serving livestock

c) Adjust the distance of the cutter from the surface of the ring mold. Usually, the distance between the knife edge and the outer surface of the ring mold is not greater than the diameter of the produced feed pellets, 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; ESr China Feed Industry Information Network - based on feed, serving animal husbandry

d) The use of a bonding granulation aid helps to improve the adhesion inside the particles. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

2, horizontal cracks across the entire pellets ESr China Feed Industry Information Network - based on feed, serving livestock

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. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

The improved method is to increase the compression force of the ring mold on the feed, that is, increase the compression ratio of the ring mold; control the pulverization fineness of the fiber, the maximum length of which cannot exceed one third of the particle size; reduce the yield to reduce the feed through the die hole The speed of time, increase the density; lengthen the time of quenching and tempering, use multi-layer conditioner or kettle type conditioner; when the powder moisture is too high or contains urea, it may also produce the appearance of eucalyptus skin. The added moisture and urea content should be controlled. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

3, the particulate material produces vertical cracks ESr China feed industry information network - based on feed, service animal husbandry

In some feed formulations, there is a fluffy and slightly elastic raw material which will swell and swell when it is tempered by a tempering machine. After being compressed by granules, it will be affected by moisture and the raw materials itself. Elastically bounces off and creates vertical cracks. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

The improvement is to change the formula, but it is possible to increase the cost of raw materials; to control the quality of the steam used in quenching and tempering, to use as much saturated steam as possible, so as to minimize the added water; Increasing the effective length of the die hole increases the time required for the feed to remain in the die hole as much as possible; the addition of the binder also helps to reduce the occurrence of vertical cracks. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

4, the pellets from a source point to produce radiant cracks ESr China Feed Industry Information Network - based on feed, serving animal husbandry

This appearance indicates that the particulate material contains large particulate raw materials. When these large particulate raw materials are quenched and tempered, it is difficult to sufficiently absorb the water and heat in the water vapor, unlike other finer raw materials, it is easy to soften, while cooling. At the time, the difference in the degree of softening causes a difference in the amount of shrinkage, so that a radiant crack is generated, so that the pulverization rate is increased. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

The improvement method is to properly control the thickness and uniformity of the powdery feed material, so that all the raw materials can be fully and uniformly softened during the quenching and tempering. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

5, the surface of the granular material is uneven. ESr China feed industry information network - based on feed, service animal husbandry

In this case, the powder used for granulation contains large granules which are not pulverized or semi-crushed. Since the granules are not sufficiently softened during the tempering process, the granules are relatively hard and relatively large, and the granules pass through the granulator. When the pores are not well combined with other raw materials, the particles appear uneven. Another situation may be that the quenched and tempered raw material is mixed with steam bubbles, and the steam bubbles cause the air bubbles to be generated during the pressing of the feed into the granules. When the granules are extruded into the ring mold, the bubbles rupture due to pressure changes. And unevenness occurs on the surface of the particles. This can happen with any fiber-containing feed. ESr China Feed Industry Information Network - based on feed, serving animal husbandry

The improvement method is to properly control the thickness of the powdered feed, so that all the raw materials can be fully softened during quenching and tempering; for the raw materials containing more fiber, it is easy to be mixed with steam bubbles, so do not add too much in this formula. Steam.

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