Jet Pulverizer, Inc. offers several Micron-Master® jet mill designs, each with unique characteristics and operational advantages. Selecting the appropriate mill type, size, and materials of construction allows users to specify a pulverizer tailored to their application. Stainless steel construction is standard for mill bodies up to 15 inches and available as an option for all larger sizes.
- Standard Single Chamber [top]
- 10 sizes from 1″ to 36″. Throughput rates of 0.2 to 6,000 lbs/hr.
- The standard Micron-Master® mill is the original single-chamber jet mill design and is representative of the conventional jet mill configuration. It is the simplest and therefore the least expensive design in the Jet Pulverizer mill family. The feed injector discharges directly into the grinding chamber at a single location. This straightforward design is ideal for materials that are easily ground, particularly those that are sticky or subject to smear buildup on the mill’s interior surfaces. Its simple construction also makes cleaning straightforward, making it a popular choice for pharmaceutical processing.
- Dual Chamber Orbital [top]
- 8 sizes from 4″ to 36″. Throughput rates of 2 to 6,000 lbs/hr.
- Based on Jet Pulverizer’s original Micron-Master® patent, the Dual Chamber Orbital mill has undergone numerous engineering enhancements and remains our most popular design. It can deliver approximately 20% energy savings per pound of material processed.
Conventional jet mills typically use a single injection port to introduce raw material into the grinding chamber. The Micron-Master® Dual Chamber Orbital design instead introduces material through multiple ports in a secondary distribution chamber, with each port positioned just ahead of the process-air input jets. This multi-point injection promotes even material distribution throughout the grinding chamber, improving efficiency and reducing concentrated wear on the grinding chamber liners.
Although the design involves additional manufacturing costs, the potential energy savings over the mill’s operating lifetime can provide substantial overall cost benefits.
- Volute Dual Chamber [top]
- 5 sizes from 12″ to 30″. Throughput rates of 30 to 4,000 lbs/hr.
- The Volute Dual Chamber mill is a modification of the Orbital-style mill and is typically configured with bottom feed and bottom discharge. The primary difference is the feed injection system. In the volute design, product enters a chamber engineered to maintain uniform feed pressure throughout the grinding chamber.
This configuration also reduces the initial impact of material entering from the feed injector, resulting in less abrasion when processing high-inertia products. Reduced abrasion can considerably extend the service life of wear components, making this design an excellent value for high-volume material processing.
- Bottom Collector Dual Chamber [top]
- 8 sizes from 1″ to 24″. Throughput rates of 0.2 to 1,500 lbs/hr.
- This exclusive Micron-Master® design allows milled material to be collected directly beneath the mill before the exhaust air exits the system. Collection efficiency can exceed 97% with dense materials.
The Bottom Collector Dual Chamber mill is particularly well suited to the cosmetics and colorants industries, as well as applications in which the same mill processes multiple products. Laboratories also favor this design for research and development, product evaluation, and product development.
A variety of product receiver options are available, ranging from 250 mL screw-on jars to stainless steel Tri-Clamp® canisters with capacities of 100 liters or more for extended production runs.
Only ultrafine particles remain in the exhaust airstream, significantly reducing the load on the dust filter media. In some applications, separating these fines is beneficial. When changing materials, cleanup may be limited to the mill and feeder because material collected in the dust filter is generally considered waste.
- Impact Dual Chamber [top]
- The Impact Dual Chamber mill features strategically positioned, hardened targets within the Micron-Master® Dual Chamber grinding chamber. These targets introduce an additional stage of particle reduction, with initial breakdown occurring primarily through impact against the targets.
Secondary particle reduction continues through particle-to-particle collisions, enhanced by the additional turbulence created by the targets. This design supports slower feed rates while achieving finer particle sizes. The additional particle reduction can also improve energy efficiency and eliminate the need for costly, energy-intensive air heaters or steam generators in some milling systems.
Depending on the specific material being processed, the Impact Dual Chamber mill can produce the finest particle sizes available from the Jet Pulverizer mill lineup.
- Tandem Dual Chamber [top]
- Available exclusively in a 15-inch size, the Tandem Dual Chamber design positions a Bottom Collector mill above the intake of a standard Dual Chamber mill. This configuration allows material that would otherwise require a second pass through the jet mill to be processed twice in a single pass through the tandem system.
By eliminating the need to return material to a feeder for a separate pass, this design can save processing time and labor while reducing material losses associated with additional handling and transfer.
The Tandem Dual Chamber mill is another example of the engineering innovation that establishes Jet Pulverizer as a worldwide leader in jet milling technology.
The Micron-Master® jet mill designs are engineered to accommodate a broad range of applications and materials, combining exceptional performance with long-lasting quality.
With extensive in-house design and manufacturing capabilities and more than 55 years of jet milling experience, Jet Pulverizer can also develop custom solutions for demanding or unusual applications. Our flexible designs and problem-solving approach allow us to tailor equipment to specific processing requirements.
Liner materials and construction options include stainless steel, PTFE, tungsten carbide, silicon carbide, polyurethane, treated steel, and alumina. These options help address demanding wear-resistance and high-purity micronization requirements.
Photo: 2-inch Micron-Master® mill, fully tungsten carbide lined.
