company news about The Most Confusing Concept in Mixer Selection: Total Volume ≠ Working Volume

The Most Confusing Concept in Mixer Selection: Total Volume ≠ Working Volume

Customers often encounter a common pitfall: they ask for a "1000L mixer" when they actually need to mix 1000L of material per batch. These two "1000L" values are not the same.

Clarifying the Two Concepts

Total Volume: The physical maximum capacity of the U‑shaped trough, i.e., the volume when filled to the rim.

Working Volume: The actual volume of material that can be mixed per batch, determined by the filling rate.

A ribbon mixer works through inner and outer helical ribbons to create axial convection and radial shear. If the load exceeds 70% of total volume, the upper layer cannot be turned effectively, and uniformity drops. If below 30%, the ribbons have insufficient contact with the material, also compromising performance.

According to industry standards, the recommended filling rate is 40%–70% of total volume, with the optimal point at 50%–60%.

So when buying a mixer, the first step is not price comparison, but calculating the relationship between your batch volume and the machine's total volume. Selecting at 50%–60% filling leaves a margin and ensures good mixing results.

Brightsail Machinery specializes in powder grinding and mixing equipment, offering ribbon mixers, plow mixers, universal grinders, and more. For selection questions, feel free to contact us.