Double Planetary Mixer

What is the Double Planetary Mixer?

A double planetary mixer has two blades that rotate on their own axes while orbiting inside a stationary bowl, sweeping the entire volume. It is the standard laboratory and pilot choice for mixing high-viscosity pastes, slurries and doughs from 1 L to 100 L.

Overview

In the double planetary mixer, two blades, often flat or helical, rotate at their own axes while orbiting around the bowl center. Blade paths overlap and come within 1 to 3 mm of the bowl wall and bottom, so no material remains unmixed. Working volumes are 1 to 100 L, with orbit speeds of 5 to 60 rpm and blade speeds of 20 to 200 rpm, often driven by a frequency converter. Some models add a high-speed disperser shaft to break agglomerates. The bowl is raised and lowered hydraulically or manually for discharge, and is commonly stainless steel 304 or 316L. The mixer handles viscosities above 1,000,000 mPa·s, including battery pastes, adhesives, putties, propellant simulants and dental materials. It is slower than a centrifugal unit but scales to larger batches and provides strong kneading.

How does it work?

A planetary mixer moves the mixing element in a planetary pattern: it rotates about its own axis while also orbiting around the vessel center, like a planet around the sun. In double planetary mixers, two blades orbit and rotate inside a stationary bowl, sweeping the full volume and wall, which gives thorough blending of high-viscosity materials up to several hundred thousand mPa·s. In planetary centrifugal mixers, a sealed container is spun on an orbital arm while also rotating in the opposite direction, so centrifugal force mixes and removes air without a blade. Vacuum options lower pressure to remove entrapped bubbles. Key components include the drive motor and gearbox, the blades or container holder, a bowl with optional jacket, a lid, speed control and, where fitted, a vacuum pump and heating or cooling system.

What are the key features?

• Two blades rotate and orbit to sweep the full bowl volume
• Working volume from 1 L to 100 L for lab and pilot work
• Frequency-controlled orbit and blade speeds for recipe control
• Optional high-speed disperser shaft for agglomerate breakup
• Bowl lift for easy discharge and cleaning
• Stainless steel 304 or 316L contact parts

What are the technical specifications?

A typical double planetary mixer configuration offers working volume of 1–100 L, orbit speed of 5–60 rpm, blade speed of 20–200 rpm, disperser speed of Up to 3,000 rpm (optional), viscosity range of Up to 2,000,000 mPa·s and blade-to-wall clearance of 1–3 mm. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Double Planetary Mixer is used in battery paste and slurry mixing, adhesive and sealant kneading, putty and dough preparation, dental and medical compounds and composite material preparation. Across the wider Planetary Mixers class, laboratories also deploy it for lithium-ion battery slurry preparation, adhesive and sealant mixing and cosmetic cream and gel formulation.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, EN ISO 12100, ISO 3219, ASTM D2196 and GB/T 15706. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the mixer on a rigid, level floor or bench sized for its weight and vibration. Verify power supply and cooling water or compressed air needs before delivery. Balance containers precisely in planetary centrifugal models, because imbalance causes vibration and bearing wear. Inspect seals and O-rings on vacuum models and clean blades, bowl and lid between batches to avoid cross-contamination. Use materials compatible with solvents, acids or abrasive fillers. Fit guards and interlocks that stop the drive when the lid or safety cover is opened, in line with IEC 61010-1 and machinery safety practice. Keep a maintenance log for gearbox oil, seals and calibration of speed and temperature sensors.

How do I select the right Double Planetary Mixer?

Choose a double planetary mixer for pastes and slurries above a few hundred thousand mPa·s, or for batches above 1 L. Use a centrifugal unit for grams-scale work. In the RFQ, specify working volume, viscosity, bowl material, discharge method and any need for disperser shaft, jacket or vacuum.

How does it compare with other Planetary Mixers variants?

Start with the viscosity range and batch size. Planetary centrifugal mixers handle small batches from a few grams to about 2 kg and are quick, with no blade to clean and minimal contamination. Double planetary mixers handle working volumes from 1 L to 100 L or more and are preferred for very high viscosity pastes and slurries. Decide whether vacuum is required for degassing, for example in battery electrodes, silicone and epoxy. Specify heating or cooling needs through a jacketed bowl, plus material compatibility such as stainless steel 316L or ceramic coatings. Check speed range, torque and whether variable orbit and rotation ratios are available. For regulated products, consider cleanability, contact materials and documentation. Safety interlocks and explosion-proof options matter where flammable solvents are used.