Rotor-stator technology (also known as high-shear rotor-stator dispersion, rotor-stator homogenizer, or high-speed dispersion mill) is one of the most powerful and widely used mechanical mixing and dispersion systems in modern industrial processing. Originally pioneered for the paint industry in 1949, this technology has become the gold standard for achieving ultra-fine, stable dispersions, emulsions, and suspensions.

How Rotor-Stator Technology Works

The core of rotor-stator technology is a high-speed rotor spinning inside a closely fitted stationary stator, creating an extremely narrow gap (often microns to millimeters). Here's the process:

Full Transcript (Extracted from YouTube with Minor Cleanup for Readability)

[00:07] Kady International manufactures the Kady Mill, a high-speed precision rotor-stator dispersion mill developed in 1949 in Buffalo, New York for the paint industry.

[00:12] Today the Kady Mill, manufactured in Scarborough, Maine, USA, is used successfully in the manufacture and processing of paint, ink, paper coatings, cosmetics, food products, pharmaceuticals, ceramics, minerals, chemicals, and a wide range of proprietary processes.

[00:26] The unique Kady dispersion head consists of a slotted rotor rotating inside of a slotted stator. The rotor, turning at very high speeds, functions as a centrifugal pump, drawing material from above and below and hurling it off the slot tips at 9,000 feet per minute, breaking it down to its smallest particle size.

[00:48] The Kady Mill is well known for its ability to quickly reduce agglomerates to their original or ultimate particle size, blending them with a liquid vehicle and wetting them out to create a stable dispersion. All wetted parts are standard in stainless steel; however, other materials of construction are available.

[01:08] The Kady Mill's great strength lies in its ability to quickly achieve dispersions, saving up to 90% of production time over prop or blade mixers. Kady is noted for its one-step processing capabilities, eliminating the need for wet-out, grind, and let-down equipment and tanks.

[01:25] The tremendous energy input of the Kady Mill — 80% faster than other rotor-stators — leads to superior dispersion results, also reducing production time and equipment cost as well as saving cleanup time and cost.

[01:40] Kady Mills can also be used in pre-milling, a powerful processing concept which combines the early milling stages and the pre-mix stage into just one efficient step.

[01:52] The typical premix-media mill process includes a saw-tooth blade mixer and multiple media mill passes. Replacing a premix blade mixer with a Kady Mill can eliminate some or all of the media mill passes, thereby reducing production and cleanup time as well as duplication of expensive equipment and its maintenance.

[02:10] Fast and efficient, the Kady continuous mill can provide flow rates of less than one to hundreds of gallons per minute. These compact, powerful, and affordable mills can be supplied in random or defined path configurations.

[02:27] The defined path configuration guarantees that the entire batch will pass through the rotor-stator, providing a completely homogenous end product, potentially doubling your line's output.

[02:38] Another option for an established production line is inserting a Kady continuous mill between an existing saw-tooth blade mixer and the media mills to accomplish pre-milling. Continuous Kady pre-milling simplifies and enhances your existing process with the addition of a high-flow recirculation Kady mill, often without any change to the line at all.

[03:01] For example, the Model OCF takes up only eight square feet of valuable floor space.

[03:08] Batch or continuous Kady Mills — standalone or in an existing line — whatever your mixing needs, Kady International's experienced engineers will help you determine the best Kady Mill or Kady system suited to your application.

[03:19] Call the dispersion experts at Kady International today or contact us online at kadyinternational.com.

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