Agitator Paddles

Agitator paddles are rotating blades or arms located inside the feed frame of a pharmaceutical tablet press. Their primary function is to continuously agitate and mix the powder formulation, preventing segregation, ensuring uniform density distribution, and facilitating consistent powder flow into the die cavities for tablet formation. They are critical for maintaining content uniformity and achieving precise tablet weight control. The paddles are mounted on a rotating shaft driven by the press mechanism. As they rotate within the feed frame's powder bed, they create a gentle tumbling and shearing action. This motion breaks up powder clumps, redistributes particles of different sizes and densities, and maintains a fluidized, homogeneous mixture that flows evenly into the tablet press dies. Typical materials include stainless steel (e.g., 316L) and food-grade plastics such as PTFE or UHMW-PE. Reference parameters for typical tablet presses include a rated capacity of 10–100 L, operating speed of 50–300 rpm, material grade 316L (ASTM A240), surface roughness of 0.4–0.8 μm Ra (ISO 4287), hardness of HRC 40–50 (ASTM E18), operating temperature of -20 to 80 °C, maximum pressure of 0.5 MPa, IP rating of IP65 (IEC 60529), weight of 2–15 kg, and tolerance of ±0.05 mm (ISO 2768). These values are directory references and must be verified for the specific model and application. The paddles are designed for use in pharmaceutical manufacturing, where hygiene and precision are paramount. They are typically installed in the feed frame of rotary tablet presses and are available in various sizes and configurations to match different press models. When selecting agitator paddles, consider the powder characteristics, required throughput, and compatibility with the press. Verify dimensions, material certifications, and surface finish with the manufacturer. Regular inspection for wear, corrosion, or deformation is recommended. If the paddles show signs of excessive wear or imbalance, they should be replaced to maintain tablet quality. Always follow the equipment manual and consult the original equipment manufacturer for genuine parts and service.

The paddles are mounted on a rotating shaft driven by the press mechanism. As they rotate within the feed frame's powder bed, they create a gentle tumbling and shearing action. This motion breaks up powder clumps, redistributes particles of different sizes and densities, and maintains a fluidized, homogeneous mixture that flows evenly into the tablet press dies.