WORKING

The product to be dispersed or emulsified is fed by gravity or under pressure to a rapidly spinning rotor. This is set very closely and precisely to a matching stationary part called a stator. The distance between them is adjusted from 0.001 to 0.125”. Generally, distances of not more than 0.020” are needed. This distance is commonly called the grinding gap. As the material comes in contact with the rotor it is flung out to the edge by centrifugal force. This force pushes the material down through the narrow gap between the rotor and stator. A particle material, while it is whirling around in this film, is subjected to a great many eddy currents of tremendous force. The product makes its way through the shear zone and finally is flung out into an open area. At this point it passes out of the colloid mill through a suitable opening.

VERSATILITY OF COLLOIDAL MIL

The Colloid Mill is the most versatile high shear mixer available. With a simple turn of the wheel, you can achieve the process results you have been looking for.
The rotor-stator gap can be adjusted on-the-fly by turning a hand wheel. Changing the gap setting allows the user to modify the shear rate applied to the fluid and achieve the desired process results.

Indicator dial defines gap-setting position and ensures process repeatability. This machine is designed to handle a wide range of applications and empowers the user to make simple adjustments to achieve the precise Product qualities they require.

THE ROTOR AND STATOR

The heart of a colloid mill is the rotor and stator. The best design is a rotor and a stator with smooth, ground and lapped faces. With this design, found in the Premier Colloid Mill, the thin film of material between them will be of uniform cross section and will be subjected to the maximum amount of shear as it whirls around. To ensure fast entry of product into the grinding gap all Colloid Mills are provided with impellers (two pins for low viscosity products and a special blade for thick material). The rapidly turning impeller creates centrifugal force to pull the material into the grinding zone. Both rotor and shaft are made of “Invar”, an alloy with the lowest coefficient of expansion of any commercially available material If the product heats up during the grinding operation, the mill temperature change does not affect the grinding gap, which stays constant. Rotors are faced with a thick layer of Satellite, harder then most abrasive materials. A matching, Stell it faced, Invar ring is set into the stainless-steel stator, When the product contains fibers, crystals or similar hard agglomerates - rough, abrasive surfaces are required. Premier uses the preferred material, silicon carbide. The stator has a specially made silicon carbide insert and the rotor a similar matching part.

MIXING MECHANISM OF COLLOIDAL MILL

The first mixing zone utilizes sharp stator teeth to mill the fluid Next, fine serrations accelerate the fluid between the ultra-smooth, hardened surfaces of the spinning rotor and stator gap Finally, and centrifugal forces impinge fluid on stator wall for additional refinemen.

HEATING AND COOLING

All mills have the stator and spillway (main housing) jacketed for use with steam, hot or cold water. Fittings for these connectors are an integral part of the mill. Materials which have to be kept in a molten state can be easily handled. Heat build-up can be minimized by using a cooling fluid in the jacket. The colloid mill can be operated at temperatures up to 350° F.

CLEANING

Product contact parts are stainless steel. A quick flush is sufficient to clean the mill after use. For more difficult products or for more thorough cleaning, every bit of surface touched by the product can be exposed in less than one minute. No tools are needed. The adjusting ring is backed off. The stator is lifted out. The interior is now completely accessible.

CLOSED CONTINUES OPERATION

Any Premier Colloid Mill may be easily converted to closed continuous operation. The inlet funnel is unscrewed and appropriate inlet piping screwed into the stator. The standard partial spillway cover is replaced with a full spillway cover having appropriate pipe fitting.

SALIENT FEATURE

• All contact parts are made out of stainless steel 316 quality. & Non-contact parts in S.S. 304 quality or cladded with S.S. 304 quality.
• Easy to operate and provided with leak proof neoprene sealing device.
• Motor connected with rotor assembly through standard ‘FENNER’ Coupling for ease of maintenance and availability.
• Three leak proof neoprene sealing device between the motor and the processing chamber to prevent liquid going in the motor winding.
• Latest design of semi concave teeth in rotor and stator reduces motor horse and gives better performance in size reduction without damaging the product. 
• Extended bearing housing specially designed to facilitate fine adjustments of bearing clearance on back lash to avoid metal to metal contact of rotor and stator.
• DOL starter with overload relay for protection against single phasing and low voltage.
• Contact parts can be easily dismantled for cleaning.
• This unique design provides smooth and consistence all round performance and long life of rotor and stator.

ADVANTAGES

Wide Range of Applications : Colloid mills can handle various materials, including slurries, fluids, and those with high viscosity.

Efficient Homogenization : They break down particles and create a fine, uniform mixture, ideal for emulsifying, grinding, and dispersing.

Easy Maintenance : Colloid mills have a simple design and are easy to clean and maintain, with components that are readily disassembled and reassembled.

Adjustable Gap Settings : The grinding gap between the rotor and stator can be adjusted to control particle size reduction.

Reduced Wear : The rotor-stator is often constructed with durable materials like toughened steel or corundum, minimizing wear.

Self-Draining : Colloid mills are often self-draining, which simplifies cleaning and maintenance.

High Capacity and Minimal Requirements : They can handle large volumes with minimal resources.

Low Noise Level : Colloid mills generally operate at relatively low noise levels. 

Suitable for High Viscosity Materials : They are well-suited for processing materials with high viscosity and larger particles.

Consistent Results : Colloid mills consistently produce similar outcomes, making them ideal for tasks requiring specific particle size control.

Versatile for Different Applications : They can be used for grinding, homogenizing, emulsifying, dispersing, mixing, and even extracting.

Adjustable Gap Settings : The gap between the rotor and stator can be adjusted to control the fineness of the material.

No Pressure Required for Ionization : The process does not require pressure for ionization, which can be beneficial in certain applications.