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What is a vacuum planetary mixer ?

Key Features of Vacuum Planetary Mixers

What is a vacuum planetary mixer ? 1

Importance of vacuum

Vacuum refers to the stirring process being conducted under negative pressure (with air removed). This serves several key purposes:

Eliminating air bubbles: This prevents air from mixing into the material, which is crucial for the production of bubble-free products such as adhesives and lithium-ion battery slurries.

Accelerated degassing: Vacuuming makes it easier to extract air bubbles from within the material.

Prevention of oxidation: This prevents heat-sensitive or easily oxidizable materials (such as certain cosmetics and pharmaceuticals) from deteriorating or discoloring during high-temperature mixing.

Importance of planetary mixing

The term “planetary motion” is borrowed from astronomy. It is the core motion mechanism of vacuum planetary mixers. The equipment typically contains two or three mixing blades (such as spiral or frame-shaped blades). These blades not only rotate around their own axes but also revolve around the center of the mixing bowl, much like a planet. This complex motion ensures that there are virtually no dead spots within the mixing bowl, resulting in highly efficient and uniform mixing.

Application of vacuum planetary mixers

The applications of planetary mixers are primarily divided into four major industries.

New Energy and Electronics Industry:


Lithium-ion battery anode/cathode slurries, electronic pastes (conductive silver paste, aluminum paste), semiconductor encapsulation adhesives, LED/LCD encapsulation adhesives

Chemical and New Materials Industry:


Silicone sealants/glass sealants, polyurethane sealants, thermal grease, adhesives, nanomaterials, and graphene

Pharmaceutical, Cosmetics, and Food Processing Industries:


Ointments, high-end creams, toothpaste, and condiments


Universities, Research Institutes, and Corporate R&D Centers:


New material formulation experiments, small-batch pilot production, and performance testing of materials

Frequently Asked Questions(FAQs)

When is a planetary mixer needed?

The material is too sticky to stir, resulting in inadequate mixing and an uneven blend. Alternatively, if you want to achieve better mixing results, upgrade your mixing method.

When is a vacuum mixer needed?

It is very important that the final product does not contain air bubbles, as it may oxidize when exposed to air or absorb moisture. Some powders also disperse more evenly when mixed under vacuum conditions.

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