How can the issue of uneven fertilizer granule sizes be resolved?

Equipment is the key to solving this problem because every stage of granulation—from material extrusion and shearing to forming and discharge—is dictated by the equipment's structure and performance. Traditional granulators often produce uneven granules due to inconsistent extrusion pressure, fixed forming apertures, and a lack of effective screening for formed granules. To address these pain points, modern granulation equipment incorporates several innovative design mechanisms. For instance, in double-roller extrusion granulators, the inclusion of precision control and lateral shifting assemblies allows for easy on-line adjustment to meet varying granule size requirements. More importantly, the lateral shifting assembly enables the crushing rollers to undergo multiple lateral displacements during rotation. This design significantly increases the contact probability between the crushing rollers and the fertilizer sheet, effectively preventing small granules from slipping through the roller gaps. This ensures, at the source, a relatively uniform base particle size for the material entering the next stage of processing.

The issue of uneven fertilizer granule sizes essentially stems from limitations in equipment precision and process control capabilities. From the lateral shifting and crushing action of extrusion rollers and adjustable forming apertures to granulation pans that integrate screening and material recycling functions, these equipment-focused technical innovations are transforming "uniform granulation" from an experience-dependent craft into a stable production capability guaranteed by hardware. When the equipment itself possesses superior material adaptability and more rigorous particle size control capabilities, particle uniformity ceases to be a variable requiring repeated adjustment and instead becomes a standard specification set at the factory.