The particle hardness of pellet feed is the main index of the appearance quality of pellet feed, and it is also found in the feeding process that the particle hardness of pellet feed has some effects on the production performance of livestock and poultry. Therefore, how to regulate the particle hardness of pellet feed is a problem that the industry is actively pursuing.
Throughout the whole process of pellet feed processing technology, in addition to the feed formula, the impact of pellet feed hardness of the processing process also includes: raw material crushing process; raw material expansion and expansion process; raw material mixing, water, oil spraying process; steam pre-conditioning process; the selection of molds in the process of pelletizing; after ripening, after the spraying process; drying and cooling process.
1, the raw material crushing process on the impact of particle hardness crushing process on the hardness of particles plays a decisive role in the crushing of raw materials is the size of the crushed particles. Generally speaking, the finer the size of raw material crushing, the easier the starch paste in the tempering process, the stronger the bonding effect in the granular material, the less likely to break the particles, the greater the hardness. In actual production, according to the production performance of different animal feed and the size of the aperture of the ring mold, crushing particle size required to make appropriate adjustments, chicken and duck material requires a coarser particle size, crushing the average particle size in the 800 ~ 900μm; suckling pig material requires a finer, crushing the average particle size in the 400 ~ 500μm; fattening pigs crushing the average particle size in the 600 ~ 700μm; fish and special aquatic material Crushed particle size requirements are finer, generally below 250μm. In the poultry feed, it is generally required that the particle hardness of pellet feed should be large, and the pulverization rate should be low to reduce the waste of feed. To improve the particle hardness of poultry pellet feed, the purpose of improving the particle hardness can be achieved by regulating the proportion of coarse, medium and fine crushed particle size of raw materials. Coarse particles refers to the particle size of 900μm above the requirement of no more than 15%, the middle particles refers to the particle size of 700μm about 35%, fine particles refers to the particle size of 500μm below the requirement of more than 50%. One of the requirements of the particle size less than 250μm of fine powder not less than 25%, this part of the fine powder in the starch in the tempering can be fully pasted, in the process of granulation plays an important role in the bonding of coarse, medium and fine particle size particles bonded together into large particles to improve the hardness of the particles and reduce the rate of chalking of the product. In the production of pig food, the hardness of the particles is generally required to be moderate, too hard will reduce the palatability and production performance of the product, too brittle will increase the chalking rate of the product, reduce the production performance and increase the waste. In the production of pig feed generally require crushed particle size between 700 to 500μm more than 70%, 250μm below the fine powder to more than 20%. Such particle size distribution is conducive to granulation and improve the quality of granule appearance, but also to ensure that the product of the appropriate hardness and low pulverization rate. In the production of fish, on the one hand, the physiological characteristics of fish animals require raw materials crushed particle size of 250μm below not less than 85%; on the other hand, small particle size is conducive to the formation of particles and stability in the water, the hardness of fish particles are relatively large, which is due to the stability of the fish material in the water should be good, the particles should be dense. The current production of fish material are hard granular material, should be developed in the direction of soft granular material.
The particle hardness of pellet feed is the main index of the appearance quality of pellet feed, and it is also found in the feeding process that the particle hardness of pellet feed has some effects on the production performance of livestock and poultry. Therefore, how to regulate the particle hardness of pellet feed is a problem that the industry is actively pursuing.
Throughout the whole process of pellet feed processing technology, in addition to the feed formula, the impact of pellet feed hardness of the processing process also includes: raw material crushing process; raw material expansion and expansion process; raw material mixing, water, oil spraying process; steam pre-conditioning process; the selection of molds in the process of pelletizing; after ripening, after the spraying process; drying and cooling process.
1, the raw material crushing process on the impact of particle hardness crushing process on the hardness of particles plays a decisive role in the crushing of raw materials is the size of the crushed particles. Generally speaking, the finer the size of raw material crushing, the easier the starch paste in the tempering process, the stronger the bonding effect in the granular material, the less likely to break the particles, the greater the hardness. In actual production, according to the production performance of different animal feed and the size of the aperture of the ring mold, crushing particle size required to make appropriate adjustments, chicken and duck material requires a coarser particle size, crushing the average particle size in the 800 ~ 900μm; suckling pig material requires a finer, crushing the average particle size in the 400 ~ 500μm; fattening pigs crushing the average particle size in the 600 ~ 700μm; fish and special aquatic material Crushed particle size requirements are finer, generally below 250μm. In the poultry feed, it is generally required that the particle hardness of pellet feed should be large, and the pulverization rate should be low to reduce the waste of feed. To improve the particle hardness of poultry pellet feed, the purpose of improving the particle hardness can be achieved by regulating the proportion of coarse, medium and fine crushed particle size of raw materials. Coarse particles refers to the particle size of 900μm above the requirement of no more than 15%, the middle particles refers to the particle size of 700μm about 35%, fine particles refers to the particle size of 500μm below the requirement of more than 50%. One of the requirements of the particle size less than 250μm of fine powder not less than 25%, this part of the fine powder in the starch in the tempering can be fully pasted, in the process of granulation plays an important role in the bonding of coarse, medium and fine particle size particles bonded together into large particles to improve the hardness of the particles and reduce the rate of chalking of the product. In the production of pig food, the hardness of the particles is generally required to be moderate, too hard will reduce the palatability and production performance of the product, too brittle will increase the chalking rate of the product, reduce the production performance and increase the waste. In the production of pig feed generally require crushed particle size between 700 to 500μm more than 70%, 250μm below the fine powder to more than 20%. Such particle size distribution is conducive to granulation and improve the quality of granule appearance, but also to ensure that the product of the appropriate hardness and low pulverization rate. In the production of fish, on the one hand, the physiological characteristics of fish animals require raw materials crushed particle size of 250μm below not less than 85%; on the other hand, small particle size is conducive to the formation of particles and stability in the water, the hardness of fish particles are relatively large, which is due to the stability of the fish material in the water should be good, the particles should be dense. The current production of fish material are hard granular material, should be developed in the direction of soft granular material.
