- Powerful primary and fine size
reduction
- Selection of models to suit
different requirements
- Quick cleaning, easy handling
- Defined final fineness due to
bottom sieves with aperture
sizes from 0.25 - 20 mm
- Wide range of accessories
including various hoppers,
collecting systems, rotors and
sieves
- Highest safety standard
|
The cutting mills provide
highly efficient primary size reduction
of such heterogeneous material mixes
as waste or electronic components
but are also suitable for many other
types of samples. With the SM 100,
SM 200 and SM 300 RETSCH offers
three models for different requirements.
No matter, whether it is a
standard mill for routine applications
or a powerful and flexible model to
handle a vast range of sample materials,
RETSCH provides the suitable instrument.
A wide selection of sieves,
hoppers and collecting systems allows
for easy adaptation to individual application tasks. All three models
are available in a special version
for heavy-metal-free size reduction
which makes them ideal for preparing
samples for heavy metal analysis
within the context of RoHS and WEEE
regulations. |
| Size reduction in the cutting mills
takes place by cutting and shearing
forces. The sample passes through
the hopper and into the grinding
chamber. There it comes into contact
with the rotor and is comminuted
between the rotor blades and the
stationary cutting bars inserted in
the housing. The dwelling time of
the sample in the chamber is short;
as soon as it is small enough to pass
through the openings of the bottom
sieve it is discharged and collected
in the receptacle. The rotor speed of
1500 min-1 (SM 100 and SM 200) resp. 700 to 3,000 min-1 (SM 300)
ensures gentle and rapid size
reduction. The motor ratings are
1.5 kW (SM 100), 2.2 kW (SM 200)
and 3 kW (SM 300). The optional
cyclone-suction-combination
(SM 200, SM 300) not only has a
cooling effect on the sample but
also improves the discharge of material
from the grinding chamber. |
 |
| High torque for primary and fine size reduction |
Cutting mills are used in many different areas of sample preparation for subsequent
analyses. To allow for optimum adaptation to the sample properties with
regards to breaking behavior and temperature sensitivity, the SM 300 features a
variable speed from 700 to 3,000 min-1. Thus it is possible to grind a great
variety of products with one mill, including tough and thermally sensitive materials.
Thanks to its flexibility, the SM 300 is particularly suitable for the varying
application tasks of contract laboratories.
An additional flywheel mass accounts for a very high torque which enables the
SM 300 to grind many materials to analytical fineness in only one working run
(RES technology, see text on the right). The grinding chamber geometry has
been thoroughly optimized. The good feeding properties and the wide opening of
the hopper allow for large sample volumes resp. pieces which helps to improve
the throughput. Moreover, the SM 300 is equipped with double acting cutting
bars which substantially increase the number and effectiveness of the cutting
events.
In combination with the wide selection of accessories, the SM 300 is ideally
suited for the effective size reduction of cuttable materials and heterogeneous
mixes. |
| Benefits at a glance |
- Powerful size reduction thanks
to 3 kW drive with high torque
and RES technology
- Perfect adaptation to
application requirements by
variable speed from 700 to
3,000 min-1
- Optimum cutting effects thanks
to double acting cutting bars
- Quick and easy cleaning due to
fold-back hopper, smooth
surfaces and push-fit rotor
- Highest safety standards due to
motor brake, central locking
device, electronic safety check
and comfort base frame
|
 |
| Easy operation and cleaning |
Operation of the SM 300 is exceptionally
simple and safe. A safety
switch prevents the mill from being
switched on with the door open. An
electronic safety check ensures
that the door cannot be opened
when the motor is running – the
motor brake makes the rotor come
to an immediate standstill after the
mill has been switched off.
The hopper can be folded back
to get full access to the grinding
chamber which, in combination
with the smooth surfaces, greatly
facilitates cleaning the mill. The
push-fit rotor can be removed
without tools. |
 |
| Powerful size reduction of many different materials |
The cutting mill SM 200 is a powerful and easy-to-operate instrument
for efficient primary and fine
size reduction.
Within the group of the RETSCH cutting
mills, it is the universal standard
model which covers a vast range of
applications with its strong 2.2 kW
drive and 1,500 rpm rotor speed.
When operated with the optional cyclone-suction-combination, the SM 200 is also suitable for grinding light sample materials or smaller quantities.
Operation of the SM 200 is easy and
safe. A safety switch prevents the
mill from being switched on with the
door open. A motor brake makes the rotor come to an immediate standstill after the mill has been switched off.
The hopper can be folded back and the push-fit rotor and sieve can be removed without tools for easy cleaning.
In combination with its various accessories, the SM 200 can be used
for many different applications. In
addition to a heavy-metal-free version, a wide selection of hoppers, rotors, sieves and collecting systems (see pages 10 – 11) is available. |
| Tips for perfect results |
| Fibrous and bulky materials (e. g. hay
or paper) are
easier to grind
when they
have been
balled up before being fed into the hopper. |
 |
| The size
reduction of
rubber and
thermoplastic
is facilitated by
using liquid
nitrogen to
embrittle the sample material. |
 |
| If larger
sample pieces
need to be
ground very
finely, it is
recommended
to first use a
bottom sieve with large perforations
for primary size reduction
and then a smaller sieve for fine
grinding. |
 |
| For routine applications |
The SM 100 is the budget-priced basic model among the RETSCH cutting
mills. It is suitable for the size reduction of soft, medium-hard, elastic or
fibrous products which can be comminuted without requiring extremely
high forces. The mill is particularly suitable for routine applications. It is
easy to operate and can be mounted on a solid table or on the optional
base frame.
The wide range of accessories makes the SM 100 a versatile instrument.
A special version of the mill is available for heavy-metal-free grinding. |
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