shrimp feed pellet machines
Pelleting is one of the most important impacting factors to pellet appearance performance. In fact, it is the configuration, installation and operation of main working parts that influence the appearance characters. Here we bring some experiences and suggestions abstracted from successful production practices in our customers' feed mills on the dies, rolls and cutters for shrimp feed pelleting.
Ring dies specialized for shrimp feed production usually made with φ1.6 or φ1.8 holes and a compression ratio of 1:20~25. The larger the compression ratio, the better the pellet appearance, bulk density, hardness and water stability. However, it also consumes more power and brings the risk of machine blockage. Some shrimp feed formula may include corrosive ingredients if conditioned under high temperature, so it is better to employ ring dies made of stainless steel. In the manufacturing of ring die, it is inevitable that burr and oxide layer exist on the inner surface of the thin die holes. Therefore, flushing a new die with feed mash of 10-15% fine sand and 10% oil-rich material for 10-20 min is a necessity.
Since shrimp feed formula is pulverized to have very small fineness, it is liable to slip from the ends of rolls when compressing. This phenomenon will accelerate the wearing of rolls and die, and should be eliminated by using a roll shell with closed-end narrow corrugations. Proper roll adjustment is critical to the operation of the pellet machine. For shrimp feed pelleting, the gap is better at 0.2mm in order to facilitate output, get good pellet quality, and prevent troubles such as mash hard to feed into die holes, increasing wearing loss and shortened service life of ring die and rolls.
The selection of cutter and its installation contribute most to the appearance of feed pellets. For shrimp feed, a blade of 0.3~0.8mm and treated by quenching to have tough and wear-resistant performance is recommended, and it should be installed to cut the tangent line of ring die from 20~30°direction. Such blades are easily worn out during production, and should be replaced with new ones after continuous production for 2~4 hours in order to achieve clean cross-section for pellets.
Ring dies specialized for shrimp feed production usually made with φ1.6 or φ1.8 holes and a compression ratio of 1:20~25. The larger the compression ratio, the better the pellet appearance, bulk density, hardness and water stability. However, it also consumes more power and brings the risk of machine blockage. Some shrimp feed formula may include corrosive ingredients if conditioned under high temperature, so it is better to employ ring dies made of stainless steel. In the manufacturing of ring die, it is inevitable that burr and oxide layer exist on the inner surface of the thin die holes. Therefore, flushing a new die with feed mash of 10-15% fine sand and 10% oil-rich material for 10-20 min is a necessity.
Since shrimp feed formula is pulverized to have very small fineness, it is liable to slip from the ends of rolls when compressing. This phenomenon will accelerate the wearing of rolls and die, and should be eliminated by using a roll shell with closed-end narrow corrugations. Proper roll adjustment is critical to the operation of the pellet machine. For shrimp feed pelleting, the gap is better at 0.2mm in order to facilitate output, get good pellet quality, and prevent troubles such as mash hard to feed into die holes, increasing wearing loss and shortened service life of ring die and rolls.
The selection of cutter and its installation contribute most to the appearance of feed pellets. For shrimp feed, a blade of 0.3~0.8mm and treated by quenching to have tough and wear-resistant performance is recommended, and it should be installed to cut the tangent line of ring die from 20~30°direction. Such blades are easily worn out during production, and should be replaced with new ones after continuous production for 2~4 hours in order to achieve clean cross-section for pellets.
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