In organic fertilizer disk granulator machines, there is a clear and stable negative correlation between the inclination angle and the final particle size. That is, when the disc's inclination angle increases, the particle size tends to decrease; conversely, when the inclination angle decreases, the particle size increases. This core principle is not artificially set, but is entirely determined by the dynamic process of the material within the rotating disc.

The key physical mechanism behind this lies in the material's "residence time" within the disc. The disc's inclination angle is the "master switch" controlling this time. When the inclination angle is set larger, the force of gravity acting on the material along the disc surface is significantly enhanced, leading to increased rolling speed and a shorter flow path. This results in extremely limited residence time for moist powdery raw materials within the disc. Often, before they can fully agglomerate and grow through repeated adsorption and encapsulation, they are rapidly carried away from the pelletizing zone, thus forming smaller but more uniform particles. Conversely, when the tilt angle is adjusted to a smaller value, the movement of the material on the disc becomes gentler, its rolling trajectory becomes longer, and the residence time is significantly extended. The raw material powder thus has ample time to adhere and compact layer by layer, like a snowball, under the action of the binder and the liquid phase, ultimately growing into compact, larger spherical particles.

Therefore, adjusting the tilt angle is the core means of directly and effectively controlling product particle size when operating a bio disk organic fertilizer machine. When the operator observes that the discharged particles are generally too large or excessively agglomerated, appropriately increasing the tilt angle is the preferred corrective measure; while when there is too much fine powder in the finished product and the target particle yield is low, the tilt angle should be decreased immediately. Of course, this adjustment needs to be coordinated with the rotation speed of the disc, the position of the scraper, and the flow rate of the spray liquid to achieve precise and stable control of particle size and quality.