company news about Solutions for fish pellet mill not producing pellets or pellets with poor shape

Troubleshooting for "no pellet discharge" should be done in the following order: "Raw Material - Parameters - Components". First, check the raw materials: If the raw material moisture content is too high (>18%), it will cause the material to stick in the die orifice and fail to discharge smoothly. This needs to be addressed by drying or mixing with dry materials to reduce the moisture content. If the raw material is unevenly mixed, trace additives may clump and clog the die orifice. The raw material needs to be re-mixed in the mixer for 3-5 minutes.

Second, adjust the parameters: If the pressure roller pressure is too low (<3MPa), the raw material cannot be fully extruded from the die orifice. The pressure needs to be increased to 4-6MPa using the hydraulic system. If the die head temperature is too low (<70℃), the raw material will have poor flowability. The heating system temperature needs to be increased to 80-90℃ and maintained for 10 minutes before testing. Third, check the components: Disassemble the die head for inspection. If there are metal foreign objects or hardened material inside the die orifice, clean them with a special drill bit. If the pressure roller surface is severely worn and the grooves are shallow, the pressure roller needs to be replaced to ensure proper fit with the die head.

"Poor particle shape" (rough surface, uneven length, easy pulverization) requires precise identification of the underlying cause. Rough particle surface is often due to uneven raw material particle size; coarse particles are not fully pulverized and need to be returned to the pulverizer for reprocessing to ensure the raw material particle size variation coefficient is ≤5%. Uneven particle length is a problem with the cutter; if the cutter is worn, replace it; if the distance between the cutter and the die head is too large (>1mm), adjust the distance to 0.3-0.5mm. Easy pulverization of particles is due to insufficient pressure from the pressure rollers or worn die holes; increase the pressure by 1-2MPa. If the inner wall of the die hole is smooth and without texture, replace the die head.

Different feed types require different adjustments for troubleshooting. When producing fish feed, if the particles have poor water resistance and are loose in shape, increase the die head temperature by 5-10℃ and increase the starch gelatinization time. When producing pet dog food, if the particles are too hard, resulting in poor palatability, reduce the pressure roller pressure by 0.5-1MPa, appropriately increase the cutter speed, and shorten the particle length. A pet food factory increased the pellet forming rate from 88% to 98% by adjusting the die temperature of its dog food pellet mill from 85℃ to 90℃.

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