If you use new ring die, check if the compression ratio of ring die matches processing material, the compression ratio is over large, the resistance of powder through the die hole is big, the pressed out pellets are too hard, the output is also low. The compression ratio of ring die is too small, 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.
If the ring die have been used for a period of time, must check if taper bore in inner wall of ring die is worn , if the pressure roller is worn, if they are badly worn, process and repair ring die, ream the taper bore again ,change pressure roller, the worn taper bore has a great influence on the output.
The clearance between ring die and pressure roller should be adjusted properly, when the livestock and poultry feed is produced, the appropriate distance is about 0.5mm. If the distance is too small, the pressure roller would rub ring die and the useful life of 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 material, especially control 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 skid in the die and hard discharging.
Pay attention to the grinding fineness of raw materials should match the diameter of die bore, the grinding fineness of raw materials of small pellet feed should be more 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.
Check the distribution of raw materials in ring die, don't allow material to run one side, if a similar situation happens, the position of the big and small feeding scraper must be adjusted, and let raw materials distribute evenly in the ring die. Not only extend the useful life of ring die, but also the discharging is more smooth.