Effect of crushing particle size on PDI: pellet feed durability index PDI

The smaller the pulverization particle size, the larger the surface area of ​​the particles, the easier it is to combine between the particles, and the easier to absorb heat and moisture during quenching and tempering. The gelatinization degree of the starch is good, so the granules produced are denser, smoother and less prone to cracks. powder. However, due to the high energy consumption in the pulverization process, the raw materials are not pulverized as fine as possible. The sieve size and pulverizer type of the pulverizer should be reasonably selected according to the diameter of the granules and the feed variety. According to the author's research, it is generally reasonable to adopt the following configuration. LNg China Feed Industry Information Network - based on feed, serving animal husbandry

For livestock and poultry materials, the ordinary hammer-type pulverizer is generally used. The particle size and the sieve hole of the sieve have the following corresponding relationship: the production is 4~5 mm granular material, and the sieve is 2.5~3 mm. Production: quasi-3~3.5 mm pellets, with quasi-2~2.5 mm sieve holes; production of quasi-2~2.5 mm pellets, with standard 1.2-1.5 mm sieve holes. LNg China Feed Industry Information Network - based on feed, serving animal husbandry

For fish feed, it is generally required that all the raw materials after pulverization pass through the 40-mesh standard sieve, and the 60-mesh standard sieve has no more than 20%, and the hammer-type micro-grinder with a sieve diameter of 0.8, 1.0, 1.2, and 1.5 mm is selected. . LNg China Feed Industry Information Network - based on feed, serving animal husbandry

For shrimp feed, it is generally required that all the raw materials after pulverization pass through a 60-mesh standard sieve, and 95% pass through an 80-mesh standard sieve, and ultra-fine pulverization is often used. LNg China Feed Industry Information Network - based on feed, serving animal husbandry

In addition, the uniformity of the particle size of the raw material is very important, and the pulverized raw material cannot have excessively large particles. The oversized particles are not easy to combine with other raw materials and affect the uniformity of quenching and tempering, and the surface of the granules tends to be uneven after granulation. Radiation cracks are generated around the large particles, causing the particles to be easily damaged and affecting the PDI of the particles. LNg China Feed Industry Information Network - based on feed, serving animal husbandry

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