| The job of plant protectors is to
protect plants against insects and pests and to increase
their resistance against other harmful organisms. |
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Alpine supplies complete systems for the manufacture
of insect spray, dust or granules. The required fineness
for dusting agents ranges between approx. 99% < 40
– 75 µm. Alpine UPZ fine impact mills are
used for this task. The particle sizes demanded for
insect sprays are between 99% and 99.99% < 10 µm
and finer, whereby fineness values of less than 40 µm
are also required. The end products range between <
10 – 40 µm in size, are free from spatter
grain, and are obtained with Alpine's AFG fluidised
bed opposed jet mills. The fine grinding of so-called
"wettable powders" without deposits or coating
formation is also possible for critical products with
low melting points.
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The system schematic shows a system for the production of plant
protectors. The design was based on the following problem specification:
Feed size: 97% < 1.5 mm
Feed moisture: < 8% H2O
End-product moisture: < 2% H2O
Demanded end- in the range of 97% < 4 - 6 µm,
product fineness: dependent on the product properties and operating
parameters. If required, the fluidised bed opposed jet mill
can also operate at predetermined temperatures in this case,
too.
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Legend
1 = Feed station for direct feed, as an alternative to
preliminary crushing with a low-speed crusher
2 = Preliminary mixer for active substances, auxiliary
components and carriers
3 = Blending silo
4 = Feed metering screw with agitator
5 = Flap valve
6 = Fluidised bed opposed jet mill AFG
7 = Automatic reverse jet filter with fluidisation unit
8 = Rotary valve
9 = Oxygen meter
10 = Safety filter
11 = Compressor
12 = Heat exchanger |
13 = Process gas distributor
14 = Blending silos with discharge screws
15 = Deaerator
16 = Packing units
17 = Control cabinet with PLC unit
A = Feed station for components such as carrier substances,
active substances, and additives, etc.
B = Feed station for the coarse preliminary crushing
step resulting in a feed material with good flow and
metering properties
C = Addition of auxiliary components and carrier substances
(liquid or powder)
D = End product
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For safety reasons, the systems for processing plant protectors
are blanketed with N2
gas and equipped with O2
monitors, or are designed to be pressure-shock-proof to 10
bar overpressure. The systems are designed to conform with
the ATEX Directives RL 94/9 EC. To suit the product properties
or in accordance with customer specifications, the product-contact
system sections are made of V2A-steel (1.4541).
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