Mills are used for the milling of solids. This milling fulfils two purposes: First, it enlarges the particle surface which increases the speed of dissolution. Second, it evens out differences between particle sizes in order to ensure that mixing can be homogeneous.
Due to their versatility, mills play a crucial role in pharmaceutical production. Mills can be integrated into complex production lines, for example for filling/emptying or transfer operations at process machines, or for filling and decanting containers (IBCs).
Their flexible use, high functionality and small footprint are decisive arguments in favor of mills. In particular in clean rooms with limited size, the small footprint of these systems is a great benefit. In addition, mills can be fitted with built-in lifting columns to allow for integration into almost any process scenario.
The mobility of the machines also increases process efficiency because the mills can be moved or even disassembled quickly and easily for use or for cleaning.
Milling with the Bohle Hammer Mill
Hammer mills (also called turbo mills) are suitable for research and development as well as for batch production and continuous production. They are used for the milling of powders, agglomerates, and granules. Hammer mills are used in particular if the application demands a precise particle reduction for hard-to-mill active ingredients and other substances. In addition, hammer mills are used to re-mill fragmented tablets.
Tablets that have already been produced undergo inspection and may fail to meet the customer's requirements for various reasons. If the tablet does not fulfil the specifications, the manufacturer can use the hammer mill to pulverize the tablets again and re-use the materials. The re-milling of the tablets and the recycling of the materials in production ultimately reduces the rejects rate and increases productivity.
BTM Hammer mill: Production up to 1,500 kg/h
BTM (Bohle Turbo Mill) hammer mills can reach speeds between 600 rpm and 6000 rpm and produce up to 1,500 kg/h. In order to achieve this, the BTM is equipped with an automatic dispenser unit (rotary feeder). This allows the operator to feed the material into the milling chamber evenly and without overloading. In addition, such automatic feeder devices can control the powder flow in the milling chamber. Further benefits: Less heat is generated, and the process can be repeated using the same parameters.
The internal rotor has two sides with different functions that support applications with wet or dry products. The knife side chops sticky products. The hammer side is used for crushing hard, crystalline products.
In the hammer mill, the particle size is defined by the sieve size selected for the mill. The BTM provides different sieve inserts that can be used to reduce the material size to as little as 0.1 mm.
Benefits of the Bohle Hammer Mill
- Easy to operate, modular and compact
- Particle size < 100 µm
- Sieve sizes from 0.1 to 4 mm
- Speed of 600 – 6,000 rpm
- Rotor with hammer and knife sides
- integrated mobile lifting column
- Almost tool-free dismantling for very quick product changeover
- Gasket made of PTFE or silicone - cGMP and FDA compliant
- Comfortable control via 7“touch panel. User management and recipe management, PDF batch printing via USB interface
Bohle Hammer Mill picture gallery
Technical Data: Bohle Hammer Mill
|BTM 150||BTM 300|
|Dimensions[LxBxH]||1370 x 900 x 1990 mm||1600 x 900 x 2300 mm|
|Height of outlet||847 – 1706 mm||970 - 1960 mm|
|Output||ca. 1500 kg/h||ca. 2500 kg/h|
|Partikle size [µm]||< 100 µm|
Available variants of the Bohle Hammer Mill
- BTM 150
- BTM 350
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