Once you have decided on a conical mill for your process, you then have a choice between under-driven and over-driven mills. Both options will have advantages in different applications, so it is important to know the process and material specifics in question before deciding.
Here’s a brief guide that highlights the key differences between the under-driven and over-driven conical mills.
Under-Driven Conical Mill Benefits
> Spacer-less design with preset optimised gap for milling. Spacers are time consuming to set up and heighten the risk of operator error in setting the gap correctly. The spacer-less design eliminates these issues.
> In-line feed and discharge for higher capacity milling. As the inlet is in-line with the outlet on the milling chamber, this makes it better for in-line processing (e.g. container to container milling) and easier system integration due to the minimal stack-up height.
> Hygienic, easy clean design. Detachable mill head allows the chamber to be removed from the machine for easier cleaning.
Over-Driven Conical Mill Benefits
> Perfect for heat sensitive materials. An over-driven conical mill uses a belt-driven gearbox which runs cooler than the gear driven alternative. This means that the machine is able to run cooler and is, therefore, better suited for heat sensitive materials.
> Robust design for more rugged applications. The belt-driven design is generally more robust and is suited to tougher materials and plant-like materials.
> Ability to change the gap between the screen and impeller. The over-driven conical mill uses spacers to set the gap which allows the gap to be altered depending on the material being processed.
> Low noise for a better working environment. Another advantage of this design is the lower noise created due to the belt-driven operation compared to mechanical gears.