Food Marketing & Technology - India June 2019 | Page 35

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after the production process (see
Figure 2).
Cryogenic grinding for high
product qualities and a long
lifetime
The Alpine Contraplex pin
mill CW II is an advanced
high-tech grinding system
for fatty products with
high fi nenesses. The latest
generation was refi ned
in collaboration with
our customers to h be st
grinding results in a high
quality
rotating mode with extreme
high relative speeds up to 24 0
m/s, measured at the outermost
pin rows. The developing
centrifugal forces in the wide
chamber of the mill create a
selfcleaning effect and avoid an
agglomeration of the nutmeg
powder for a guaranteed gentle
and long-time milling process.
The improved door design gives
easy access to the grinding area
for maintenance and cleaning
Food Marketing & Technology
35
June 2019
The high fat content of the
nutmeg is the biggest challenge
to pass in the milling process.
On the one hand, evaporation
of essential oils (6-15%) must
be minimized because the oil
content of the spice defines its
market price. On the other hand,
the high fat content can cause
a build up during the milling
process and can clog the mill in
the worst case. Due to this, the
Hosokawa Alpine cryogenic
grinding process with CO2 or
LN2 is a proven technology that
makes the nut easier to mill.
A screw cooler cools the feed
product in a nitrogen bath down
to minus 30 to minus 80 degrees.
A cryogenic control valve unit
for precise dosing of the cooling
agent, as well as a temperature
control and a O2 monitoring
enable precise adjustments and
control. The cooling process
gives the nutmeg a porous
structure, which makes it easier
to break and less sticky. A purge
air system free of dead spaces
around the new, gearless drive
avoids build ups of the product
(see Figure 3).
The fineness of the product
is variable, depending on the
temperature, particle size and
pre-treatment (see Figure 4).
* The Author Barbara Kästl is Sales
Manager Business Development,
Food Division Hosokawa Alpine
Aktiengesellschaft in Augsburg,
Germany