A hammer mill typically relies on screens to control the particle size of the final product by allowing only particles smaller than the screen openings to pass through. However, there are methods to achieve finer grinding without using a screen. Here are some approaches:
Higher Rotational Speed: Increasing the speed of the rotor can enhance the impact force, leading to finer particle size.
Air Classification: Integrating an air classification system can help separate finer particles from coarser ones without the need for screens. Airflow carries the finer particles away from the grinding chamber, leaving the coarser particles to be further reduced.
Adjustable Grinding Plates: Some hammer mills come with adjustable grinding plates that can be set closer or farther apart, influencing the fineness of the grind.
Different Hammer Configurations: Using different types of hammer configurations, such as the use of sharper or wavy hammers, can impact the fineness of the grind.
Multiple Pass Grinding: Passing the product through the hammer mill multiple times can gradually reduce the particle size.
Cryogenic Grinding: Utilizing low temperatures during the grinding process can make materials more brittle, leading to finer particles when struck by the hammers.
Each method has its own set of advantages and is chosen based on specific material requirements and desired particle size.
