Dry granulation in roller press granulator produciton lines does not rely on glue or require water drying. Raw material parameters directly affect the granulation rate; moisture content, fineness, and ingredient ratio are key. The overall moisture content of the raw materials is optimally controlled between 8% and 12%. Moisture content below 6% results in loose powder that is difficult to extrude and granules that are easily crushed. Moisture content exceeding 15% easily clogs the rollers and die holes, leading to frequent roller blockages and production stoppages. Raw materials with excessively high moisture content must be pre-dried or mixed with dry fine materials for adjustment.

Regarding material fineness, all raw materials should be pulverized to within 2 mm, with fine powder accounting for more than 70%. Fine powder acts as a binder and carrier. Coarse fiber straw and long grass clippings must be pulverized and sieved. Excessive coarse fiber content will clog the roller grooves, resulting in loose, non-granulated extruded flakes. When producing organic-inorganic compound fertilizers, organic raw materials are combined with nitrogen, phosphorus, and potassium powders, and appropriate amounts of humic acid and bentonite are added. The raw materials themselves are physically extruded and bound together, eliminating the need for additional binders.

When the proportion of salty raw materials, such as ammonium chloride and potassium chloride, is high, large crystals should be minimized, and large-particle fertilizers should be crushed in advance to prevent hard objects from scratching the roller skin. Hard impurities such as stones and iron blocks in the raw materials must be removed by iron removal and screening in advance to prevent them from entering the roller gaps and damaging the roller skin and bearing housing.

Daily batching should be kept as stable as possible. Frequent changes in raw material ratios can easily lead to inconsistent pelleting results. Proper control of raw materials ensures a stable pelleting rate of over 85%, reduces undersize return material, lowers the load on fertilizer production machine, and effectively extends the service life of vulnerable parts such as roller skins and bearings.