Retsch Cutting Mill SM 300
Cutting mills are suitable for the grinding of soft, medium-hard, tough, elastic, fibrous, and heterogeneous mixes of products. Thanks to the powerful 3 kW drive with high torque and RES technology, the Cutting Mill SM 300 excels especially in the tough jobs where other cutting mills fail. This mill allows for perfect adaptation to application requirements by variable speed from 100 to 3,000 min-1. A range of bottom sieves with aperture sizes from 0.25 - 20 mm is available, ensuring a defined final fineness.
HIGH TORQUE & RES TECHNOLOGY
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 graphic on the right). The extra peak power derived from the flywheel mass is used to overcome potential blockages, even when grinding particularly tough materials. Additionally, RES technology enables quick sample feeding.
RES TECHNOLOGY - PEAK POWER OF UP TO 20 KW
The diagram shows the torque (green) and the power (blue) of the drive as well as the temporarily achievable peak power (red) against the speed. The peak power increases over the entire speed range. That means, the higher the speed, the more power is temporarily available for the cutting events.
SUPERIORITY IN DETAIL
CYCLONE-SUCTION-COMBINATION
Ideal for light & heat-sensitive materials
Instead of the gravity outlet, an optionally available cyclone separator can be connected to the SM 300. The use of the cyclone is advantageous, for example, for light and heat-sensitive samples.
- Increased throughput
- Improved sample discharge from the grinding chamber
- Efficient cooling of sample and cutting tools
- Collecting vessels with 0.25 - 0.5 - 1 - 2 - 5 and 30 liters are available for the cyclone unit
DOUBLE-ACTING CUTTING BARS
#
The SM 300 is equipped with double-acting cutting bars which substantially increase the number and effectiveness of the cutting events. The parallel section rotor, for example, generates 18 cutting events per rotation.
EASY OPERATION & CLEANING
Operation of the SM 300 is exceptionally simple and safe. The push-fit rotor and bottom sieves can be easily removed without tools. A safety switch prevents the mill from being started with the door open. An electronic safety check ensures that the door cannot be opened when the motor is running.
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. So does the design of the bottom sieves which reduces trapping of sample pieces to a minimum.
SPEED REDUCTION - LESS FINES, LESS TEMPERATURE RISE
Reduction of the speed leads to a decreased fine fraction of the sample and to more particles within the desired size range. Especially for this type of application, the lowest speed of the SM 300 was reduced to 100 min-1. This is also beneficial for grinding heat-sensitive materials: reduced speed results in less energy input, preventing the sample from getting too warm during the process.
316L STAINLESS STEEL VERSION FOOD GRADE
For applications like small-scale production of food or cosmetics, the SM 300 is available in a stainless steel 316L food-grade version which meets the guidelines of the food and pharma industry. It is equipped with a long-stock hopper for easy feeding of materials like cannabis plant parts. All parts in contact with the sample are made of 316L in this configuration. Optionally, the rotor blades and the cutting bars are made of FDA-certified stainless steel which is less prone to wear under constant stress than 316L.
The unit can be equipped with an optional cyclone and a large 30 l receptacle (both stainless steel 316L) for collecting large sample amounts. Smooth surfaces lead to almost 100% sample recovery and easy cleaning.
ACCESSORIES FOR SAFE AND EFFECTIVE GRINDING PROCESSES
ROTOR TYPES
A parallel section rotor, a 6-disc rotor, and a V-rotor are available in stainless or heavy-metal-free steel for optimum adaptation to sample properties.
HOPPER TYPES
The SM 300 can be equipped either with the universal hopper, which is suitable for most samples, or the long-stock hopper which is specially designed for long samples.
BOTTOM SIEVES
The bottom sieves with trapezoid or square holes are made of stainless steel or heavy-metal-free steel.
TECHNICAL DATA
| Applications | size reduction by cutting |
| Field of application | agriculture, biology, chemistry/plastics, engineering/electronics, environment/recycling, food, medicine/pharmaceuticals |
| Feed material | soft, medium-hard, tough, elastic, fibrous |
| Size reduction principle | shearing, cutting |
| Material feed size* | < 60 x 80 mm |
| Final fineness* | 0.25 - 20 mm |
| Speed at 50 Hz (60 Hz) | 100 - 3000 min-1 |
| Rotor peripheral speed | 4.7 - 20.3 m/s |
| Rotor diameter | 129.5 mm |
| Types of rotors | parallel section rotor / 6-disc rotor / V-rotor |
| Types of hoppers | universal, long stock |
| Material of grinding tools | stainless steel, steel for heavy-metal free grinding, tungsten carbide |
| Sieve sizes | trapezoid holes 0.25 / 0.50 / 0.75 / 1.00 / 1.50 mm square holes 2.00 / 4.00 / 6.00 / 8.00 / 10.00 / 20.00 mm |
| Collector systems / capacities | collecting receptacle 5 l / optional: 30 l collecting unit 0.25 / 0.5 l cyclone-suction combination (0.25 l - 30 l) |
| Drive | 3-phase asynchronous motor with frequency converter |
| Drive power | 3 kW with flywheel mass ~ 28.5 kg |
| Electrical supply data | different voltages |
| Power connection | 1-phase |
| Engine brake | yes |
| Protection code | IP 20 |
| W x H x D closed | 576 (1080 opened) x 1677 x 750 mm (with base frame and universal hopper) |
| Net weight | ~ 160 kg |
| Standards | CE |
*depending on feed material and instrument configuration/settings
-
ManufacturerRetsch GmbH
-
Country of OriginGermany
-
Voltage220–230 V, 50/60 Hz, with frequency converter for variable speed, 220–230 V, 50/60 Hz, with frequency converter for variable speed, housing of stainless steel, 220–230 V, 50/60 Hz, with frequency converter for variable speed, for grinding without heavy-metal contamination
