Sieve Mills

Sieve Mills

Sieve Mills are developed for the gentle milling of heat sensitive products in the pharmaceutical industry. Later these mills acquired a permanent place in the food production industry as well.

Depending on the respective application, the user can select between 27 and 400 rotor oscillations per minute. This operating principle gives rise to numerous advantages: The milling process generates only a minimal amount of heat. The result of this gentle process is products with a very uniform grain size distribution and minimal fine particle fraction. Grain sizes of between 50 mm and 250 ìm are achievable / 100 g/h for laboratory applications to 4 t/h for industrial use.

Construction

In addition to the proper adjustment of the mill, selecting the right size and appropriate sieve geometry are a key factors for optimum sizing results.

Square mesh sieve for fragmentation and dry sizing:

• The material is fragmented on the edge of the square mesh wire and not finely ground, as is the case with a round mesh sieve.
• The advantage therein is a 20% improvement in performance.

Round mesh sieve for wet sizing:

• To produce a granular product, it is necessary to cut through wet mass. These sieves consequently have a very fine wire relative to the mesh size.

Conclusion: the thinner the cut, the less effort required.

The rotor plays a very important role in sizing. For this reason it is necessary to prevent wear, as this reduces the efficiency of the mill by:

• poorer performance
• discrepancy in granulometry
• greater fine particle fraction

Obviously, another important factor is the adjustment of the space between the rotor and sieve via the rigid screen support or the sieve tensioner.

Process

The oscillating and rotating sieve mill guarantees optimum sizing results plus excellent flow rates. The oscillating rotor movement, ensuring constant, uniform speed and force effect gentle sizing of the product. The advantage of this process resides in an exceptionally low fine particle fraction in the end product, as well as being capable of processing heat sensitive products.

Applications

The oscillating sieve mill is ideal for use in industrial processes in addition to being ideal for processing small amounts of product in laboratories. Enabled by it's modular concept and it's versatile sizing system provided by the oscillating or rotary rotor movement, the sieve mill can be employed everywhere, particularly for heat sensitive or difficult-to-process products. Wherever fine particle fractions, narrow grain size range, and low heat stress are important; the oscillating sieve mill is the answer.