Core Technology & Working Principle
Three jobs happen inside a dispersing kettle, and they do not share an optimum speed. Scraping the wall is a torque problem and runs slow — typically 20 to 60 rpm — because the anchor has to move a paste that behaves closer to a solid than a liquid. Breaking powder agglomerates is a tip-speed problem and runs fast, upward of 1,000 rpm at the disc rim. Reducing droplet or pigment size to the micron level needs a narrow rotor-stator gap with high relative velocity. Force all three onto one shaft and at least two of them run badly. Volumetric displacement decides the rest: on a 20,000 L batch, the material at the wall is metres away from the shaft, so an agitator that only stirs its own immediate neighbourhood leaves a stagnant thermal boundary layer that scorches while the middle of the batch is still cold. The PSK answers this by giving each duty its own driven shaft with independent VFD control, and by making the low-speed anchor the piece that keeps the whole batch circulating into the other two.
▲ Low-Speed Scraping Anchor
A perimeter anchor fitted with flexible PTFE blades wipes the vessel wall and bottom on every revolution. It sets up the bulk 3D convective flow that carries material from the wall back into the center, and it keeps product moving across the heat-transfer surface so nothing sits long enough to burn on.
▲ High-Speed Dispersing Shaft
The sawtooth disc runs at tip speeds that generate the hydraulic shear needed to wet out and de-agglomerate dry powders. This is the shaft that decides how much of the pigment or filler actually contributes to color strength and how much stays locked inside unwetted lumps.
▲ Independent Third Shaft
The third axis is specified to the recipe: a rotor-stator emulsifying head for phase homogenization, a second disperser for high solids loading, a ribbon screw for paste turnover, or a butterfly impeller for very high viscosity. It is a driven shaft, not a fixed blade, so it can be run at a speed the other two cannot reach.
Precision Engineered Details
A three-shaft vessel is judged on how the shafts, the frame and the seal behave together, and on where the finished unit sits in the plant. The views below are from our own builds and installations.
PSK Series Technical Parameters
Power figures are given as ranges because shaft sizing follows the viscosity curve of your product, not only the batch volume. A formulation that is thin at charge and thick at discharge needs more torque on the anchor than the nominal capacity alone would suggest.
| Model | Capacity (L) | Main Motor Power (kW) | Dispersing Power (kW) | Emulsifying Power (kW) | Agitator Speed (rpm) |
|---|---|---|---|---|---|
| PSK-1 | 50 – 100 | 2.2 – 4 | 5.5 – 7.5 | 4 – 5.5 | 0 – 1450 |
| PSK-2 | 200 – 300 | 4 – 5.5 | 11 – 15 | 7.5 – 11 | 0 – 1450 |
| PSK-3 | 500 – 600 | 7.5 – 11 | 18.5 – 22 | 11 – 15 | 0 – 1450 |
| PSK-5 | 1,000 – 1,200 | 15 – 18.5 | 30 – 37 | 18.5 – 22 | 0 – 1450 |
| PSK-8 | 2,000 – 3,000 | 22 – 30 | 45 – 55 | 30 – 37 | 0 – 1450 |
| PSK-10 | 5,000 – 8,000 | 37 – 45 | 75 – 90 | 45 – 55 | 0 – 1450 |
| PSK-15 | 10,000 – 20,000 | 55 – 75 | 110 – 132 | 75 – 90 | 0 – 1450 |
*Parameters above are standard reference values. Working volume, motor ratings, blade combination and the specification of the third shaft are built against your process viscosity and production scale. Explosion-proof configurations are available upon request, confirmed against your hazardous-area classification. Reference projects in your industry are available on request.
Our Manufacturing Advantages
🏢 Direct Source Factory
Steel fabrication, vessel welding and multi-shaft dynamic balancing are all done in our 9,000 m² Wuxi plant. Balancing three shafts on one head plate is the step most often subcontracted elsewhere, and it is the step that decides whether the machine runs quietly at 1,450 rpm.
✈️ 30–45 Days Fast Delivery
Standardized vessel heads, stocked stainless plate and modular drive assemblies let us ship standard PSK configurations within 30 to 45 days from drawing approval.
🛡️ Strict Quality Control
Each unit goes through jacket pressure testing, run-in of all three shafts at operating speed, and a vacuum hold test on the sealed vessel before dispatch, under our ISO 9001 and CE certified manufacturing system.
🔧 3-Year Global Warranty
Every PSK kettle is covered for three years on the main structure and drive motors, with fast parts courier dispatch. Scraper blades, mechanical seals and drive belts are stocked as consumables.
Target Application Spectrum
A three-shaft dispersing kettle is specified where a single batch has to be dispersed, homogenized and degassed without a transfer:
Structural & Assembly Adhesives
Silicone & PU Sealants
Wall Putties & Plaster Pastes
Composite & Laminate Pastes
Ready to Consolidate Your Mixing Process?
Send us the material type, the maximum viscosity in cps, the target batch size and whether the process needs vacuum — our Wuxi engineers will recommend the exact three-axis configuration and return a direct factory quote within 24 hours.
Technical FAQ
Short answers to the questions buyers ask before specifying a multi-function dispersing kettle or triple shaft mixer.