Double Planetary Mixer: PVC Production & Compounding

Double Planetary Mixer

The unique mixing capabilities of double planetary mixers make them well-suited for use in various stages of PVC production and compounding. The double planetary mixer consists of a double U-shaped bowl welded together, with two Z-type sigma blades that rotate in opposite directions to each other. The machine is designed to achieve utmost kneading and mixing efficiency, with the clearance between the walls and the containers kept as minimal as possible. 

Details of Double Planetary Mixer

  • The common agitators include paddle type, twist type, claw type, and frame type.
  • good mixing, reaction, kneading, and dissolution functions.


inks, colorants, dyes, coatings, and other industries.

Polyvinyl chloride, commonly known as PVC or vinyl, is one of the most widely used types of thermoplastic in the world. Its versatility, durability, and cost-effectiveness have made it a popular choice for applications ranging from pipes and siding to medical devices, flooring, wire and cable insulation, and more. However, to achieve the desired properties and consistency in PVC products, precise mixing and blending of the raw materials is required. This is where double planetary mixers excel.

What is a Double Planetary Mixer?

The double planetary mixer is widely used in the PVC plastic industry for various mixing and blending operations. Its unique design and working principle make it particularly well-suited for handling high-viscosity materials, such as PVC pastes and compounds. The mixer’s ability to achieve a thorough and consistent blending of materials makes it an essential tool in the production of PVC-based products, including PVC compounds, plastisols, PVC resins, and other PVC formulations.

The PVC industry benefits from the double planetary mixer’s high mixing efficiency, which ensures the uniform dispersion of PVC resins, plasticizers, stabilizers, and other additives. The mixer’s versatility allows for the incorporation of minor ingredient additions into PVC pastes and compounds, resulting in homogeneous blends with shorter batch times. Additionally, the mixer’s ability to handle high-viscosity materials makes it an ideal choice for PVC processing, where the thorough dispersion of additives and the uniform blending of PVC formulations are critical to the quality and performance of the final products.

This intense shearing and folding motion allows double planetary mixers to thoroughly blend even very viscous or non-flowable materials with minimal air entrainment. They can quickly and efficiently incorporate additives, disperse pigments, and homogenize formulations – all while using relatively low motor horsepower compared to other mixer types. Their compact design also takes up less floor space than horizontal or vertical shaft mixers.

FPM double planetary mixer

Applications in PVC Processing

Dry Blending of PVC Resin and Additives:
The first major use of double planetary mixers is for dry blending the base PVC resin powder with various additives before compounding. These additives may include plasticizers, stabilizers, lubricants, impact modifiers, flame retardants, pigments, and more. Precisely metering and thoroughly dispersing these additives throughout the resin is crucial to achieving uniform properties in the final product. Double planetary mixers excel at this task, quickly and homogeneously incorporating additives into the resin powder without degradation.

Compounding of PVC Formulations:

After dry blending, the blended PVC/additive mixture must be compounded by melting and dispersing the additives within the resin matrix. This is often done using a twin-screw extruder or internal mixer. Some compounders prefer to perform an initial pre-compounding step using a high-shear double planetary mixer first to ensure optimal additive wetting and dispersion before extrusion. The intense shearing action of the mixer helps solubilize and homogenize the additives within the molten PVC.

Post-Compound Mixing and Coloring:

Double planetary mixers are also well-suited for post-compound mixing applications. After extrusion or internal mixing to disperse additives, the molten PVC compound may require additional mixing to maintain dispersion, incorporate further additives, or achieve a uniform color. Double planetary mixers can efficiently perform dispersive mixing of color concentrates, blowing agents, or other components directly into the molten compound without degrading material properties. Their intense shearing prevents the re-agglomeration of dispersed phases.

Benefits of PVC Processing

The unique mixing capabilities of double planetary mixers provide several key benefits for PVC production applications:

– Thorough, rapid blending – Ensures uniform properties and consistent quality in final products.
– Gentle, low-shear mixing – Less risk of material degradation compared to high-shear mixers.
– Compact design – Takes up less floor space than horizontal mixers.
– Variable speeds – Allows matching energy input to material viscosity for optimal results.
– Sanitary, cleanable design – Important for food-contact and medical-grade applications.
– Closed mixing chamber – Minimizes dust and environmental concerns.
– Easy discharge – Quick material transfer to downstream processes.
– Low energy use – Requires less horsepower than alternatives.
– Long service life – Planetary mixing motion is low-wear.
– Automation compatibility – Can integrate with process control systems.

The unique double planetary mixing action provides superior blending capabilities that make this mixer type highly advantageous for various applications in PVC production and compounding. Their ability to thoroughly yet gently disperse additives and achieve homogenous formulations directly impacts the quality, consistency and properties of final PVC products. As PVC continues to be widely used in an array of markets, double planetary mixers will remain an important tool for compounders and processors.

As a professional double planetary mixer manufacturer, FRANLI provides a complete set of mature equipment for related machines and production lines for more than 60 countries and thousands of industries in the world, and in Russia, Turkey, Spain, Brazil, Malaysia, Indonesia, and other regions, for Many enterprises have established related production lines.

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Guidelines For Double Planetary Mixer

FRANLI is a professional double planetary mixer manufacturer. Our double planetary mixer is especially suitable for dissolving, mixing, kneading, and reacting from powder to high-viscosity and high-density materials. According to different viscosities and material characteristics, Choose the right stirring paddle, and provide supporting equipment and production lines for double planetary mixers.

Double Planetary Mixer
Guidelines For Double Planetary Mixer

How to buy a double planet mixer?

This double planetary mixer can mix all types of viscosity of the material in no time. This double planetary mixer contains high-capacity blades that can work from 1 million centipoises to 8 million centipoises.

Double Planetary Mixer
Guidelines For Double Planetary Mixer

Double Planetary Mixer For Sale

FRANLI double planetary mixer is a high-efficiency, multi-purpose, and no-dead angle mandatory mixing and dispersing equipment.

Double Planetary Mixer
Guidelines For Double Planetary Mixer

Electronic Slurry & Double Planetary Mixer

Double planetary mixers are widely used, especially in the field of electronic slurry, whether it is stirring or mixing, the final output effect has been recognized by all walks of life.

Laboratory Double Planetary Mixer
Guidelines For Double Planetary Mixer

Double Planetary Mixer: Laboratory & Production

There are two types of double planetary mixers produced by FRANLI, which mainly involve two major application fields, one is laboratory research type, and the other is a factory production line

Double Planetary Mixer
Guidelines For Double Planetary Mixer

Structural Adhesive Production Equipment & Double Planetary Mixer

The double planetary mixer is one of the ideal types of equipment for low-viscosity materials. This facility has a low and fast mixing dispersing disc, which can complete the functions of high shear and dispersing low viscosity materials at the same time.

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