The ring die granulator is an important equipment for pellet feed processing and is widely used in feed processing for animal husbandry, poultry farming and fisheries. Domestic feed production enterprises flourish with the adjustment of the national economic structure Locknuts For Use With Rolling Bearings Round Nuts With Rolling Bearings,Carbon Steel Locknuts,Metric Locknuts For Use,Flange Nylon Nut Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
The ring die granulator is an important equipment for pellet feed processing and is widely used in feed processing for animal husbandry, poultry farming and fisheries. Domestic feed production enterprises have developed vigorously with the adjustment of the national economic structure. Therefore, the domestic research and production of feed processing equipment is also developing rapidly, and the pellet feed has obvious good palatability and high efficiency. Domestic research on the ring-shaped particle mechanism granulator has been carried out in various aspects and at various levels, and has carried out fruitful research on the grain quality, productivity, ring die and roll life of the ring-forming granulation mechanism.
I. Research progress on particle quality of ring mold granulation mechanism
The quality evaluation indicators of pellet feed generally include particle hardness, surface finish, chalking rate and water resistance. These indicators are influenced by factors such as product formulation, original cooking properties, particle size of raw materials, quenching and tempering effects of raw materials before granulation, degree of ripening, working parameters of pellet machine and cooling effect.
Second, the impact of raw materials on granulation quality 400 granule machine The quality of pellet feed production is good or bad, the granulation performance of raw materials is very important. The granulating properties of the feed ingredients refer to the ease with which the raw materials are pressed into granules. Generally speaking, the raw material granulation performance is good, the pressed particles are relatively smooth, and the particle quality is relatively good. On the contrary, the particle quality is poor.
From the perspective of raw materials, the particle size of raw materials, the content of protein, fat, fiber, starch, moisture, etc. in raw materials are all factors that affect the quality of raw material granulation. The particle size determines the surface area of ​​the feed component, the particle size is fine, the surface area is large, the particles absorb the water in the steam quickly, the quenching effect is good, the viscosity of the particles is good, the hardness of the finished particles is hard, and the powder produced after the crushing is On the contrary, the particle quality is poor; the particle size of the raw material is too large or the particle size distribution is uneven, which may cause the surface of the particle to be radially cracked or uneven, easily broken, and the powder content and the powdering rate are increased; fat is also beneficial to granulation. The function of the lubricant can reduce the wear of the granules and make the material easy to pass through the ring hole, which improves the quality of the granules. There are two sources of fat in the feed, one is contained by itself, and the Other is added from the outside. If the fat content is too high, the particles will be softened and loosened rapidly, which is difficult to form. The protein in the feed will increase the plasticity and viscosity of the feed after being heated, and the gelatinization effect of the starch at high temperature can also increase the plasticity and viscosity of the pellet feed; The moisture content is a key factor affecting the quality of the granulation. The granulation process adds a certain amount of water or steam, which can be used in each of the materials. A thin aquifer is formed on the outside of the granule to make it easy to pass through the die hole. At the same time, the natural binder in the raw material can be diluted, thereby improving the quality of the granule, but the moisture content is high, and the granules are reduced in moisture. The addition also affects the granulation temperature increase when steam is added, the starch is difficult to gelatinize, and the fiber is difficult to soften. Researcher Yu Yuhua believes that for general livestock and poultry materials, the grain size requirements of the raw materials are all passed through the 8-mesh analysis sieve, and the sieve mesh of the 25-mesh sieve is not more than 35%. The pore size of the pulverizer screen using the one-time pulverization process is required to be 2 to 3 mm. The grain size requirements of the fish and shrimp are finer. The freshwater fish bait and the raw material grain size are all passed through the 40 mesh sieve. The 40 mesh sieve is not more than 20%. The external fat content is 0.5% to 2%, and no more than % fiber. The content of the raw material does not exceed 15%, the water content of the raw material does not exceed l3%, the starch has a tempering temperature of 82 °C to 85 °C, and the water content of the feed after conditioning is 16% to 17%.
Of course, there are many factors affecting the quality of granulation, and it is also very complicated. Sometimes it is necessary to consider many factors in order to achieve the desired granulation effect and produce high quality granules.
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