Method of Operation
With the PALLMANN
double stream mill the feed material is reduced
through a new, pioneering principle. The fan
effect of a multiple wing impeller pulls the
feed material centrally into the grinding
chamber passing through a special feed chute
designed as a gravity separator for heavy
material. An especially designed material
guiding cone distributes the material evenly on
the periphery and the entire width of the
grinding track. The impeller, rotating at high
speed, produces high air turbulence between the
impeller wear plates and the serrated profile of
the grinding track.
The double stream
guides the feed material through this intensive
turbulence in axial direction or in the cross
stream depending on the profile used on the
grinding track. The material is reduced in high
velocity air stream by repeated impact onto the
impeller wear plates and the grinding track
profile. Through the air guide and within the
flow channels of the grinding track a
cross-stream sifting is achieved. Discharging of
finished product takes place only after the
dragging force of air exceeds the kinetic
rebound energy applied to the particles. In the
area of this actual flow the percentage of
mechanical friction is extremely small resulting
in an extended service life of impeller wear
plates and refining elements. |
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Advantages & Features
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Homogeneous material preparation |
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Low specific power requirements |
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High throughput capacity |
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Adaptable for different materials |
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Easy adjustment of required fineness |
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Easy exchange of wear parts |
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Very low maintenance cost |
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Applications
Double Stream Mills,
type PSKM are air-swept mills for gentle
pulverizing of dry or moist, soft to medium hard
materials. They are used for fiberizing of
cellulose materials, wood and annual plants.
They ensure cool
grinding at high throughput capacities with
narrow particle size distribution.
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Chemicals |
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Pharmaceuticals |
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Foods |
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Minerals |
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Cellulose |
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Wood |
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Plastics |
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