In the field of tableting, different types of presses have distinct mechanical operating principles. This post addresses the practical aspects of comparing tableting speeds between rotary tablet presses and single punch presses, focusing on the concepts of practical dwell time and contact time.

Understanding Practical Dwell Time

Single punch presses do not guide the punches under a pressure roller like rotary tablet presses. Consequently, a theoretical dwell time cannot be calculated. However, it is still possible to compare the tableting speeds of these presses by using practical dwell time.

Practical dwell time is defined as the time during which 95% of the maximum force is exceeded. You can also find 90% as value to be exeeded. Currently, there is no data indicating which of these values more accurately represents the theoretical dwell time.

The Role of Contact Time

Contact time is another important parameter, representing the total duration the powder is pressurized. In practical terms, the 5% (or 10%) value is used to measure this.

By understanding and applying these concepts, manufacturers can better compare and optimize the performance of different tablet presses, ensuring efficient and effective production processes.