Internal Lifters (Fights)

Internal lifters, commonly referred to as flights, are critical components installed along the inner wall of rotary granulation drums. These strategically angled plates lift bulk materials (powders, seeds, or nuclei) as the drum rotates, creating a cascading curtain that ensures even distribution of binding agents, coatings, or active ingredients. They optimize particle movement, enhance mixing efficiency, and promote uniform granule growth through controlled tumbling and attrition.

As the rotary drum rotates, the angled lifters scoop and elevate material from the bottom. Upon reaching a critical height, gravity causes the material to fall back in a cascading curtain, exposing particles uniformly to spray systems or other granules. This continuous lift-and-cascade action ensures homogeneous coating, agglomeration, and drying.