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AIR SWEPT MILL MODEL "PPS" WITH AIR CLASSIFIER
The mill type PPS are designed for the fine or finest grinding of many materials of medium hardness and abrasiveness, such as:
- Powder coatings
- Chemicals
- Vegetable products (dried vegetables, cocoa, soia, cereals etc)
- Pesticides
These mills have a high speed vertical axis rotor on which many vertical pins or hammers of suitable shape are fixed.
The grinding action is provided by impact against smooth or toothed lining and by friction between layers of the processed material.
The product is pneumatically discharged upwards, through an air classifier. The special design with coaxial shafts of rotor and classifier mounted on suitable bearings provide a compact construction and an easy installation.
The dynamic microclassifier, with special shape and deflector, is suitable to obtain powders at a fineness up to 99% finer than 30 micron, with average diameter d50 adjustable in the range 2 – 20 micron with granulometry distribution in a narrow range.
The adjustment of the fineness it is made by the variation of the speed of the classifier, the capacity of the suction blower, and the speed on the rotor.
The oversize not passing through the micro-classifier returns to the grinding area where it is further pulverized.
Only the product with the requested granulometry is collected after the mill.
The high flow of air (or other gas) and the mill’s design reduce the heat transfer to the product, compared with other type of mills.
The mills type PPS can be fed with dry materials up to 8 mm.
• The mills type PPS are suitable for contemporary grinding and drying of raw materials with moisture up to 10 ÷12% (chemicals products, vegetables)
• In case of heat sensitive or flammable raw materials (cocoa, vegetables), it is possible to blow cold air or inert gas through the mill (nitrogen)
CONSTRUCTION FEATURES
• Screw feeder or Rotary valve feeder. For certain applications the raw material is fed pneumatically to the mill
• Pins / hammer made of special heat treated steel. Tungsten carbide tips available for abrasive materials .
• Smooth or toothed grinding lining
• Coaxial shafts made in Cr.Ni. steel rotating on suitable bearings
• The machine can be supplied in mild or stainless steel and with special wear resistant protection
• Fast opening of grinding chamber with an hydraulic system allows easy cleanability and spare parts changing.
CONSTRUCTION FEATURES
| PPS300 | PPS500 | PPS750 | PPS1000 | ||
| Diameter of the mill rotor | mm | 200 | 400 | 600 | 850 |
| Power requirement of the mill | Kw | 7,5 | 11-22 | 55÷75 | 90÷110 |
| Power requirement of classifier | Kw | 1,1 | 3-5,5 | 7,5÷11 | 15 |
| Hourly capacity | Kg/h | 10-50 | 100-200 | 200÷2000 | 400÷3000 |
| Speed of the mill | rpm | 3000-5000 | 2000-4000 | 1400÷2400 | 1000÷1800 |
| Speed of the micro classifier | rpm | 1000-4000 | 1000-3000 | 500÷3000 | 400÷2500 |
| Filter necessary | mq | 10-20 | 40-60 | 40÷100 | 100÷180 |
| Noise Level (1 m) without noise insulation systems | mq | 95-100* | 95-100* | 95-100* | 95-100* |
* The noise level could change depending on the working conditions.
Data and features may change without any previous advice.
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