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Effect Of Grain Size On Feed Quality.
Mar 10, 2018

Grinding is an important link in the process of feed processing, and also an effective way to improve the digestibility of livestock and poultry. Its purpose and function: one is to improve the utilization value of materials; Second, improve the processing quality of feed products. Grinding process is an important part of improving feed quality in feed processing, and is one of the necessary means to make the feed rational use. The size of particle size should be determined according to the type of raw material, the type of feeding animals, the growth stage and the process requirements, and the coarse and fine grain size has its drawbacks and cannot reach the optimal production status. Based on years of experience in the quality control of feed production enterprises, the author summarized the influence of crushing grain size on the quality of feed.


1. The main factors affecting the particle size of the material.


The grinder machine: the machine is different, its crushing effect and the effect is also different, feed mill main models are:
(1) hammer type crusher that is characterized by simple structure, easy to maintenance, has good versatility and good adaptability, good safety, high efficiency. The roller mill is characterized by high productivity, low energy consumption, less dust, uniform particle size, less heating and less water loss.
(2) claw type pulverizer, finished product granularity is fine, can handle more wet and high viscosity material without congestion, the mixture of the crushing process is also a certain function, is a small mill in rural areas is widely applied. The micro - crusher and the super - seal crusher are mainly used for the pulverization of premixed raw materials and the crushing of special aquatic feed, which is characterized by fine particle size.


2. Hammer film: it is the main vulnerable part of the grinder, its shape, size and working density and arrangement method have an influence on the output, power consumption and product quality of the grinder.


3. The end of the hammer of linear velocity: within a certain range, the end of the hammer of linear velocity is larger, the higher the productivity of the mill, the unit product power consumption is reduced, but too fast, will increase the no-load power of crusher, vibration and noise will increase, crushing efficiency will decline.


4. Screen size and opening rate: the larger the screen mesh size, the larger the crushing material output, the coarser the material particles; The larger the opening rate is, the larger the crushing material output is, the more uniform the material particles are, but the opening rate is too large, which will reduce the screen strength and shorten its service life.


5. The larger the size of the screen, the larger the screen size and the higher the crushing efficiency.


6. Hammer screen clearance: the clearance of the hammer screen refers to the distance between the top of the hammer and the surface of the screen when the rotor is running. It is an important factor affecting the crushing efficiency. Too large and too small will increase the power consumption and reduce the crushing efficiency, so that the particle size of the crushed material is uneven.


7. The structure of the crushing chamber and the installation of the tooth plate: they can effectively destroy the material circulation layer and improve the effective strike number of the hammer to the material, thus improving the crushing efficiency.


8. Discharging mode: the discharging device should be able to discharge and transport the crushed material in time. Currently there are three kinds of usually USES the way of discharge: gravity blanking, pneumatic conveying and mechanical transmission and suction, the effect is the best in mechanical transmission and suction way, this is also the main discharge methods used by large mill.


The influence of particle size on feed utilization ratio.


Some raw materials, especially raw grain raw material, such as corn, wheat, rice, soybean, etc., seed coat is hard and dense, direct feeding, digestive juices are hard to dip their internal, material crushing, tearing the grain seed, exposed internal nutrient, make the material has a larger surface area, to facilitate better digestive juices to infiltration of livestock and poultry, improve the digestibility of feed of livestock and poultry. According to the data, the grain powder grain with diameter of 0.85 ~ 0.95mm was fed to the piglets with a grain powder of 1.7 ~ 1.8mm in diameter, and its digestibility increased by 3% ~ 5%. At the same time, the material after crushing, improved the palatability of livestock and poultry, and reduced the animals to gather the food due to chew collection of prolonged, affect animals breath and digestion and absorption, increase feed intake of energy consumption, reducing the feed utilization rate. Of course, it is not the finer that the material is crushed, the particle size of general material is 0.5 ~ 2.0mm, due to the difference of livestock breeds, breeding stages and raw materials. Because the powder is too fine, it will make the palatability of the animal become worse, so that the material is stuck in the middle cavity of the animal, and it is not easy to swallow. At the same time, the fine powder can easily cause gastric ulcer. Moreover, because the powder is too fine, it will increase the feed processing power consumption. Reduce the production and increase the wear of the mill and its hammer, screen and other accessories to reduce their service life.


The effect of particle size on the mixing uniformity of feed.


The particle size of the material affects the mixing uniformity of feed. According to the test with the test, the writer found that the smaller the average particle size of hybrid material, particle size, the more uniform, the mixing speed slower, while hybrid can achieve the uniformity is higher, and the subsequent delivery, less prone to grading phenomena in the process of storage. On the contrary, when the materials with different particle diameters are mixed, the uniformity of mixing can be poor. Therefore, from the mixing process, the crushing particle size of various raw materials is required to be smaller and similar, so as to achieve a good mixing effect and ensure the product quality.


The effect of particle size on granulation.


Material crushing granularity of granulating process, such as grain quality has great influence, the same kind of material particle size and particle size composition is different, make the grain quality will be different, the more fine grain powder material, the starch particles after steam modulation, can more fully gelatinization, and water content is relatively uniform. At the same time, the fine material can decrease the die wear and tear, can make more smooth and no crack grain, the grain structure is compact, pulverization rate is low, but the superfine grinding can increase the crushing power consumption, reducing mill production, make the crushing material temperature, this kind of material easy to knot the arch in the warehouse, etc. According to the test, test, DaiZhi materials maximum particle size is not more than half of the ring die aperture, the particle size of more than 1 mm material proportion is not more than 20%, can be obtained more ideal particles, and can effectively avoid the powder carefully and bring negative effects.