The granulation mechanism has fast particle size and good effect. The special filter screen is designed and carefully sieved. The friction filter rod can crush the sieved solid particles and is widely used in the pharmaceutical, chemical and food industries. This machine can replace the swinging pellet machine and is a new generation of pellet equipment. In the production of granulating machine pellets, there are sometimes particulate materials with abnormal appearance. For less experienced or new feed manufacturers, sometimes the problem is not found. In the following, the reasons and improvement methods of the seven common abnormally-produced granular materials are introduced to everyone for comparison and reference in feed production. 1. The pellets are bent 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 pellets; 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. 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 lies in 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. 3, the particulate material produces vertical cracks 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. The improvement method is: Change the formula, but this may increase the cost of raw materials; control the quality of the steam used in quenching and tempering, try to use more saturated dry steam to minimize the added water; reduce the yield or increase the effective cavity The length, as much as possible, allows the feed to stay in the die hole for an increased time; the addition of a binder also helps to reduce the occurrence of vertical cracks. 4, the pellets from a source point to generate radiant cracks 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. The improvement method lies in Properly control the thickness and uniformity of the powdered feed ingredients, so that all the raw materials can be fully and evenly softened during quenching and tempering. 5, the surface of the pellets is uneven. 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. The improvement method lies in Properly control the thickness of the powdered feed, so that all raw materials can be fully softened during quenching and tempering; for raw materials containing more fiber, do not add too much steam to this formula because it is easy to contain steam bubbles. 6, whisker-like pellets When the pellets are produced, if too much steam is added, too much steam will accumulate in the fibers or powders, and when the pellets are extruded into the ring mold, the particles will burst due to the sharp changes in pressure and the fibers or particles will be broken. The raw material protrudes from the surface to form the whiskers, especially in the production of high starch, high fiber content feed, the more steam is used, the more serious the situation. The improvement method lies in Good conditioning. When we granulate high-starch, high-fiber feed, low-pressure steam (0.1-0.2Mpa) should be used to allow the moisture and heat in the steam to be fully released into the feed. If the steam pressure is too high, or the downstream pipeline after the pressure reducing valve is too short from the conditioner, generally greater than 4.5m, the steam will not release the water and heat well, so there is part of the steam accumulation. In the tempered feed ingredients, when the granulation is carried out, the whisker-like particle effect described above is caused. In particular, special attention should be paid to the pressure regulation of the steam and the installation position of the pressure reducing valve. 7, individual particles or individual particles inconsistent color, commonly known as "flower material" This situation is more common in the production of aquafeeds, mainly because the color of individual particles extruded from the ring die is darker or lighter than the color of other normal particles, or the surface color of individual particles is inconsistent, thus affecting the appearance quality of the whole batch of feed. . The reasons for this phenomenon are mainly the following: a) Due to the complex composition of aquatic feed ingredients, there are many kinds of raw materials, and some ingredients are added in a small amount. When mixing raw materials, if the mixing effect of the mixer is not ideal, it is difficult to ensure that the mixed raw materials entering the granulator are uniform. Therefore, in the process of quenching and tempering, under the combined action of moisture, temperature and pressure, physical and chemical changes occur in the raw materials, resulting in inconsistent color changes of raw materials of different components, resulting in "flowers". It is more prominent when the feed formulation contains sensitive changes in temperature and moisture. b) The moisture content of the raw materials used for granulation is inconsistent. In the aquatic feed production process, in order to compensate for the loss of raw water after ultrafine pulverization, a certain amount of water is added to the mixer, and then mixed into the conditioner for quenching and tempering. Some feed manufacturers have a simpler process. Instead of using a special nozzle to evenly inject a certain amount of water directly into the mixer, it is difficult to evenly distribute the water after mixing. When the mixed raw material enters the conditioner to adjust the quality, it is impossible to further distribute the water evenly in a short time due to the conditioner. Under the action of steam, the ripening effect of each part of the feed after quenching and tempering is inconsistent, granulation. After the color change is also inconsistent. c) Recycled material with heavy replicated particles in the granulation bin. After the granulated granules are cooled and sieved, they can become finished materials. The fine powder or small granules after sieving often enter the process and re-granulate, usually into the mixer or the granulation bin. Since this kind of returning material is re-tempered and granulated, if it is mixed unevenly with other raw materials after quenching and tempering or mixed with small pellets, sometimes "flower material" will be produced for some feed formulations. d) The inner wall finish of the ring mold aperture is inconsistent. Due to the inconsistent mold hole finish, the resistance and squeezing force of the granules during extrusion are different, and the color changes are inconsistent. In addition, some of the ring mold holes have burrs on the wall, and the particles may scratch the surface when extruded, so that the surface color of the individual particles is different. For the four reasons for the "flower material" listed above, the improvement method is clear, mainly to control the mixing uniformity of the components in the formulation and the mixing uniformity of the added water; improve the quenching and tempering performance, If necessary, control the quenching and tempering temperature, use a lower quenching and tempering temperature to reduce the color change; control the returning machine material, for the formula that is easy to produce "flower material", try not to return the machine material directly to granulate, should return the machine material and After the raw materials are mixed, the pulverization is repeated; the ring mold with a guaranteed quality is used to control the smoothness of the die holes, and if necessary, the die holes are sanded and then used. In summary, for the unusual appearance of pellets in feed production, seven representative expressions are discussed above, and some of the appearance anomalies of the particles are not representative and are not listed here. As can be seen from the above discussion, the reasons for these phenomena are multifaceted and not completely isolated from each other. This requires us to analyze and grasp the key issues when dealing with such problems in actual work. Only then can solve the problem. (Original title: 7 kinds of feed production process factors causing mildew, can not be ignored!) Our range of Kitchen taps and Sink Mixers are available in a gorgeous choice of designs. Choose from a range of contemporary or traditional Sink Mixer Taps or Kitchen Sink Mixer. For the ultimate flexibility, also take a look at our range of Kitchen Sink Mixers. Our Kitchen taps and Sink Mixers combine exceptional quality design with real value for money. 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