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[post_date] => 2015-01-06 10:52:36
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[post_content] => In the case of jet milling, one takes advantage of the fact that as compressed gas exits a nozzle, it is accelerated to extremely high speeds. In expanding, the energy contained in the compressed gas in the form of heat is converted to kinetic energy. The speed of sound is initially a natural limit for the exit velocity.
But by using Laval nozzles, the exit velocity can be increased to above the speed of sound. Laval nozzles are characterized by their hourglass shape, which widens downstream of the narrowest cross-sectional point, the nozzle throat. The length of the divergent part of the nozzle is adapted to suit the operating pressure. Compressed air of 20°C and 6 bar overpressure is frequently used as the grinding gas, and delivers nozzle exit speeds of around 500 m/s.
As a result of drawing in gas and product from the fluidized bed, the speed of the gas jets sinks extremely rapidly after exiting the nozzles. Comminution is a result of inter-particle collision in the jets of air and also in the core area, i.e. the point where the opposing jets intersect. Jet mills are impact mills which are used to achieve maximum fineness values. Such particle sizes can only be obtained in connection with an air classifying step. Spiral jet mills have a static air classifier integrated into the mill housing, whereas fluidized bed opposed jet mills are equipped with a dynamic deflector-wheel classifier.
The fineness is set as a function of the classifying wheel speed. All-important is a high product loading of the nozzle jets in order to achieve a high concentration of particles and thus high impact probabilities. The patented Megajet nozzles were developed with this in mind. They consist of four small nozzles which as a result of their close proximity generate an under-pressure at their common center, and thus draw particles from the fluidized bed direct into the center of the nozzle jet. The product level in the machine is controlled by means of load cells or by monitoring the current loading of the classifier drive.
[post_title] => Alpine TFG Fluidized Bed Jet Mill
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[post_name] => alpine-tfg-fluidized-bed-jet-mill
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[post_modified] => 2026-06-11 14:50:57
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[1] => WP_Post Object
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[post_content] =>
| Model |
|
SF 1420 |
SF 1824 |
| Throat Size at Chamber |
Inches |
14 x 20 |
18 x 24 |
| Screen Area |
Sq. Inches |
337 |
493 |
| Motor |
HP |
15 – 30 |
25 – 50 |
| Cutting Circle Diameter |
Inches |
12.5 |
16 |
| Rotor Knives |
Number |
3 |
3 |
| Bed Knives |
Number |
2 |
2 |
| Throughput |
Lbs/Hr |
1,200 |
2,100 |
| Blower |
HP |
1.5 |
3-5 |
| Cyclone |
Model |
50 |
75 |
[post_title] => Polymer Systems Premium Shurfeed Granulator
[post_excerpt] =>
[post_status] => publish
[comment_status] => closed
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[post_name] => polymer-systems-premium-shurfeed-granulator
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[post_modified] => 2026-06-01 10:27:26
[post_modified_gmt] => 2026-06-01 14:27:26
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[post_content] =>
[post_title] => Alpine Picoline
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[post_status] => publish
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[post_name] => alpine-picoline
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[post_modified] => 2026-08-13 14:35:57
[post_modified_gmt] => 2026-08-13 18:35:57
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[post_author] => 2
[post_date] => 2015-01-06 10:52:36
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[post_content] =>
| Model |
|
1624 |
1632 |
| Throat Size at Chamber |
Inches |
16 x 24 |
16 x 32 |
| Screen Area |
Sq. Inches |
564 |
750 |
| Motor |
HP |
25 – 30 |
30 – 40 |
| Cutting Circle Diameter |
Inches |
16 |
16 |
| Rotor Knives |
Number |
3 |
3 |
| Bed Knives |
Number |
1 |
1 |
| Weight – SPL / SIL |
Lbs |
2,200 / 2,220 |
2,500 / 2,530 |
| Throughput |
Lbs/Hr |
900 |
1,100 |
[post_title] => Polymer Systems Large Part Granulator
[post_excerpt] =>
[post_status] => publish
[comment_status] => closed
[ping_status] => closed
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[post_name] => polymer-systems-large-part-granulator
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[post_modified] => 2026-06-01 10:34:07
[post_modified_gmt] => 2026-06-01 14:34:07
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[post_content] =>
| Model |
|
912 |
1116 |
1120 |
| Throat Size at Chamber |
Inches |
9 x 12 |
11 x 16 |
11 x 20 |
| Screen Area |
Sq. Inches |
190 |
297 |
373 |
| Motor** |
HP |
7.5 – 10 |
10 – 15 |
15 – 20 |
| Cutting Circle Diameter |
Inches |
10.3 |
12.5 |
12.5 |
| Rotor Knives |
Number |
2/3 |
2/3 |
2/3 |
| Bed Knives |
Number |
1 |
1 |
1 |
| Weight – SPL / SIL |
Lbs |
1,050 / 1,200 |
1,500 / 1,800 |
1,600 / 2,200 |
| Throughput*** |
Lbs/Hr |
400 |
500 |
650 |
| Bin Capacity |
Cubic Feet |
3.6 |
3.6 |
6.2 |
[post_title] => Polymer Systems Press Side Granulator
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[post_name] => polymer-systems-press-side-granulator
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[post_modified] => 2026-06-01 10:26:21
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[post_date] => 2015-01-06 10:52:36
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[post_content] =>
[post_title] => Alpine Ventoplex Air Classifier
[post_excerpt] =>
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[post_name] => alpine-ventoplex-air-classifier
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[post_modified] => 2026-06-11 15:00:35
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[post_date] => 2015-01-06 10:52:36
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[post_content] =>
| Model |
|
1010 |
| Throat Size at Chamber |
Inches |
10 x 10 |
| Screen Area |
Sq. Inches |
240 |
| Motor |
HP |
7.5 – 10 |
| Cutting Circle Diameter |
Inches |
10 |
| Rotor Knives |
Number |
3 |
| Bed Knives |
Number |
2 |
| Weight – SPL / SIL |
Lbs |
675 |
| Throughput |
Lbs/Hr |
300 |
[post_title] => Polymer Systems Hot Melt Granulator
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[post_status] => publish
[comment_status] => closed
[ping_status] => closed
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[post_name] => polymer-systems-hot-melt-granulator
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[post_modified] => 2026-06-01 10:36:48
[post_modified_gmt] => 2026-06-01 14:36:48
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[post_content] =>
Benefits
- Continuous drying, milling and classifying in a single compact system
- Safe drying of temperature-sensitive products — even at elevated temperatures
- Produces ultra-fine, uniform powders in just seconds
- Handles moist solids with up to 80% moisture content — including slurries, pastes, doughs, filter cakes and wet powders
- High evaporation capacity and fast thermal transfer
- 30–40% lower energy consumption per kg of evaporated water compared to conventional drying technologies
- Small footprint and excellent accessibility for inspection and cleaning
Rotor Types
Hosokawa Flash Dryers are available with a choice of three rotor types, selected according to product characteristics and specific process goals. Each rotor offers distinct advantages to suit a wide range of applications:
- DMR Rotor
A high-speed multi-blade rotor designed for strong dispersion, generating a powerful air vortex with tip speeds of up to 110 m/s. Ideal for maximum dispersing performance.
- MDH Rotor
A horizontally driven rotor with swinging hammers for intensive grinding. Recommended for processing slurries and pastes requiring strong milling.
- MDV Rotor
A vertically driven grinding rotor that gently disperses wet agglomerates and solids. Suited for mild dispersion and grinding of heat-sensitive products.
[post_title] => Micron Drymeister Flash Dryer
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[post_name] => micron-drymeister-flash-dryer
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[post_modified] => 2026-06-04 13:18:18
[post_modified_gmt] => 2026-06-04 17:18:18
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