How Do I Scale Up from a 2L Lab Mixer to the 15L SXJ Without Losing Quality?
Question: We developed our silicone formulation on a 2L laboratory planetary vacuum mixer for li-ion battery slurry mixing. Now we need to produce 15-liter batches. Will the mixing result be the same? What parameters should I transfer?
Answer: Scaling up from a 2L lab unit to a 15L production vacuum planetary mixer is one of the biggest concerns for formulators, and rightly so. The good news is that all SXJ models share the same fundamental double-planetary geometry. When you move from the SXJ-2 to the SXJ-15, the paddles maintain the same relative motion pattern, simply scaled to a larger vessel. This geometric similarity is the key to linear scale-up.
The parameters you need to transfer are not necessarily the rpm, but the tip speed and the number of revolutions the paddles make per batch. The SXJ-2 has a revolution speed of 0-51 rpm and self-rotation of 0-112 rpm, while the SXJ-15 offers 0-43 rpm and 0-99 rpm. Because the paddle diameter increases, the tip speed at the same rpm is higher on the larger machine. Therefore, you may actually run the SXJ-15 at a slightly lower rpm to achieve the same shear profile. Our application engineers can calculate the exact settings based on your existing process.
Another critical factor is vacuum exposure time. With the SXJ-15, the batch volume is larger, so degassing time may need a slight extension to achieve the same bubble-free finish that your 2L laboratory planetary vacuum mixer for li-ion battery slurry mixing delivers. We usually recommend running a small trial on a 5 litre lab planetary vacuum mixer machine as an intermediate step, which further de-risks the scale-up.
Here is a quick look at how the SXJ lab-scale models relate to the SXJ-15:
Lab to Production Scale-Up Path
| Model | Working Volume | Revolution Speed (rpm) | Disperser Speed (rpm) |
|---|---|---|---|
| SXJ-2 | 2 L | 0-51 | 0-2980 |
| SXJ-5 | 5 L | 0-51 | 0-2980 |
| SXJ-15 | 15 L | 0-43 | 0-2980 |
Notice that the disperser speed remains constant up to 2980 rpm across these models, so high-shear dispersion scales predictably. This consistency is why many customers start with a 2L laboratory planetary vacuum mixer for li-ion battery slurry mixing, confirm the recipe on a 5 litre lab planetary vacuum mixer machine, and then move confidently to the SXJ-15 or even a 150L planetary vacuum mixing and dispersing machines system. If you ever consider an arv-310 vacuum planetary centrifugal mixer for lab work, remember that its cost is high and it cannot knead pastes the way a double planetary vacuum mixer does, making it less suitable for direct scale-up.
