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If you use a new ring die, check if the compression ratio of the ring die matches the processing material. If the compression ratio is too large, the resistance of powder through the die hole is high, the pressed out pellets are too hard, and the output is also low. The compression ratio of the ring die is too small, and the pressed-out pellets are out of shape. Must select compression ratio again and check if the inner bore of ring die is smooth and ring die is with the lose of roundness, inferior ring die because of the inner bore is coarse, ring die is with the lose of roundness cause big resistance of discharging, pellets are not smooth, hard discharging and output is lower, so you must use high-quality ring die.
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If the ring die has been used for a period of time, check if the taper bore in the inner wall of the ring die is worn, if the pressure roller is worn, or if they are badly worn. Process and repair the ring die, ream the taper bore again, and change the pressure roller. The worn taper bore has a great influence on the output. The clearance between the ring die and the pressure roller should be adjusted properly. When livestock and poultry feed is produced, the appropriate distance is about 0.5mm. If the distance is too small, the pressure roller would rub the ring die, and the useful life of the ring die is shortened. If the distance is too large, the pressure roller would skid, and the output is reduced.
Note that the conditioning time and quality of raw materials, especially controlling the moisture of raw material before entering the pellet mill, the moisture of raw material is usually 13% before conditioning. If the moisture is higher, the moisture of raw materials is too high,≥１６％ after conditioning, causing skidding in the die and hard discharging.
Pay attention to the grinding fineness of raw materials, which should match the diameter of the die bore. The grinding fineness of raw materials for small pellet feed should be finer. Meanwhile, ensure the quality and temperature of steam; if the steam quality is poor and the conditioning temperature is low, both can affect the curing effect of powder materials and reduce the output.
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Check the distribution of raw materials in the ring die; don't allow material to run on one side. If a similar situation happens, the position of the big and small feeding scrapers must be adjusted so that raw materials are distributed evenly in the ring die. Not only does it extend the useful life of the ring die, but also the discharge is smoother.
Source: Online/GFMM
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