DRAG 
DRAG 
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The LAARMANN ring mills are essential for all applications which demand the grinding of hard, brittle and fibrous material down to analytical end fineness
Method of operation
With a LAARMANN Ring Mill you put the sample together with a disc or a set of rings and roller in a bowl to bring it all together into 3-dimensional vibrations. Inside the bowls the sample will be ground and homogenized by high pressure, impact and friction rapidly down to analytical end fineness. Typically samples are ground to 90-95% <75μm in app. 3 minutes. Exact time and end fineness depends on the sample characteristics
According to the desired maximum volume of the bowls you can select between LAARMANN Ring Mills
LM 250: Bowl 20cc to 300cc
LM 1000: Bowl 20cc to 1000cc
LM 2000: Bowl 50cc to 2000cc
LM 5000: Bowl 5000cc
The optional Liftboy makes the handling of the larger grinding sets more easy. By a digital display all parameters can be programmed and controlled very easily (time, interval, right-left rotation...) The cabinet has a drawer to collect dust and any excessive material. Additionally the cabinet can be separated from the vibrating unit very easily for service
Typically samples can be ground to 90 to 95% < 75 μm, in app. 3 minutes.
LAARMANN bowls, rings and rings are available in various materials as follows:
Will our equipment suit your requirements? Send us a test sample for evaluation. Our application laboratory is pleased to conduct pre-purchase trials on customer free supplied samples.
If you require a test-grinding please click the Questionnaire Milling button and fill out the form.
| Ambient temperature | 5°C – 40°C |
| Atmospheric humidity | 85% RH |
| Dimensions W x D x H (inclusive base plate) | 1400 x 730 x 1460 mm (1900mm with hood open) |
| Max volume of milling cups | 3500cc |
| Noise emission (without milling bowl) | 70 dB(A) |
| Power supply | 400V ± 10% – 50/60Hz |
| Rated power | 2200W |
| Timer | 5 sec – 99 min, timer HOLD function, in 1 sec steps (below 10 min), or 10 sec steps (above 10 min) |
| Weight | 490 kg |