How to choose the right ring die of pellet plant?

The price of ring die of pellet plant can be divided into stock cost, metal processing cost, drilling cost, heat treatment cost, fine reaming processing cost, management cost and profit. The price of the same kind of



material stock is essentially the same in different factories. The price for ring die with the thickness of under 45mm is basically the same. For large aperture ring die with the thickness of more than 45mm, material expense should be added. The scrap iron produced in metal processing can offset the processing fees. While the drilling cost is related to the amount of holes. Small aperture ring die has more holes that the drilling cost would be a little higher. The cost of heat treatment is determined by the weight of ring die. It is essentially the same for each manufacturer. Fine reaming processing cost is also related to the number of holes on the ring die, the price of small aperture ring die is a little higher. While the management cost varies, the bigger the factory, the lower the management cost. For profit, each manufacturer is different, some profits are 1-4 times higher than the cost of ring die, while some are reasonable.
 
Choose suitable compression ratio of ring die. Pellet produced by ring die with large compression ratio has large density and smooth surface. On the contrary, the pellet would be not strong enough with loose appearance, and this is also one of the causes of high powder content of pellet. The size of die hole and the compression ratio are mainly determined by user's formula and the varieties of feed. For the selection of compression ratio of ring die, due to various formula, different raw materials and granulating process, the appropriate compression ratio depends on the production experience of feed manufacturers in the production. An approximate range can be given based on past experience. Generally speaking, for livestock and poultry feed, the appropriate compression ratio should be 8 ~ 13; the appropriate compression ratio of fish feed is between 11 to 16. The appropriate compression ratio of shrimp feed is between 16 and 25. Heat sensitive feed should between 7 ~ 9 and forage and straw feed should between 5 to 7. Feed producers can adjust the aperture and compression ratio of ring die  pellet mill according to the appearance of feed.
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