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SUPER MICRON MILL MEC,M Attrition Type Ultra Fine Mill

Fig. Super Micron Mill MEC-1

Fig. Super Micron Mill MEC-1

Summary

The Super Micron Mill is an attrition type ultra fine mill equipped with grinding and classifying mechanisms, as well as separation removal of foreign objects. Since the establishment, Hosokawa has focused on being the leader in developing fine grinding mills, and in 1930 we developed the Micron Mill. After many years of improvements to the unit, in 1953, we developed the Super Micron Mill M model. To further improve this unit, in 2005, we introduced the newly renewed Super Micron Mill MEC model, which has a far superior grinding efficiency and easy disassembly design compared to past models. (The descriptions to continue will be mainly based on the Super Micron Mill MEC-1 Model.)

By increasing the surface area of the powder through the grinding process, various characteristics of the product, such as reactivity, solubility, shape of particles, performance, dispersibility, and taste can be enhanced. However, as particle sizes become smaller, problems of adhesion within the machines, costs of production and facilities increase. To solve this on going problem, the Super Micron Mill MEC model has been developed to utilize impact, shearing, and attrition force to efficiently grind the materials.
("SUPER MICRON MILL" is a registered trademark of HOSOKAWA MICRON CORPORATION in Japan)

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Principle

Fig.1 Ground Calcium Carbonate

Fig.2 Application of Licorice

Fig.3 Super Micron Mill MEC-1

Fig.4 Flow of Super Micron Mill

2 grinding blades and 1 windmill shaped rotor make up the Super Micron Mill’s grinding. In the space between the blades and the windmill rotor, there are 2 corners which stick out called knocks. The raw materials are carried to the grinding chamber by the suction of the fan. Once in the grinding chamber, the powders then become ground by the impact generated by the blades. The knocks generate turbulence within the grinding chamber where the friction between particles enhances the fine grinding process efficiently.
There is a screw located at the bottom of the unit, which separates any contamination from the powder and discharges it out of the unit.

Fig.5 Schematic figure of impact, shear and attrition grinding

<Means of controlling particle size>

• Air volume of the unit
Controlled by the blower or valve located at the outlet of the unit.
*Attach a bag filter and blower to the outlet of the unit for particle size adjustment.
• Exchangeable bush
Control by exchanging the bush located at the outside of the pinch blade. (internal diameter can be changed)
Controlling the turbulent airflow using the air straightening plate
• Control by installing or removing the air straightening plate. Remove the air straightening plate to produce finer products.

<Contamination Separation Mechanism>

Contaminations and/or coarse particles found within the crushed materials tend to have larger masses and depending on the raw material, they have higher degrees of hardness as well. These materials are pushed to the outer portions of the grinding chamber by the centrifugal force generated within the unit and develop a layer. The contamination separation mechanism is a unique design that utilizes a screw to continuously separate and discharge these contaminants from the unit. This mechanism becomes the most effective when used for the following targets.
• Products with high purity and whiteness : talc, calcium carbonate (removal of impurities)
• Grinding of fibrous raw materials, increase of feed capacity : striped bamboo (removal of stems and leaf veins)
• Continuous grinding of raw materials with high oil content : soybean, etc. (removal of skin)

Fig.6 Structure

Features

• Grinding mechanism that utilizes the 3 largest grinding principles (Impact, Shearing, Attrition) : Can be used for spheroidizing of materials as well.
• Compact Space : 65% more compact compared to past models. (Compared as a whole system)
• Low Noise level : under 85dB
• Easy disassembly and maintenance : constructed in stainless steel, grinding rotor with a cantilever structure, etc.
• Equipped with a contamination separation mechanism

Other information

Super Micron Mill M model

The Super Micron Mill M model uses the same attrition grinding mechanism as the renewed MEC model. We have delivered over 300 units of the M series mostly used for grinding of mineral and inorganic materials.

Fig.7 Super Micron Mill M52NC

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