Digital sieving machine suitable for test sieves of up to 450mm diameter 

The Laarmann sieving machine is designed for batchwise and continuous sieving of middle hard, hard brittle,tough and soft materials. The model LMSM-300/450 is used in all areas where a solid material must be separated quickly and reproducibly. Either for a separation process or for the following analysis.

Sieving analysis general

A gradation test is performed on a sample of aggregate in a laboratory. A typical sieve analysis involves a nested column of sieves with wire mesh cloth (screen). A representative weighed sample is poured into the top sieve which has the largest screen openings. Each lower sieve in the column has smaller openings than the one above. At the base is a round pan, called the receiver.

The column is typically placed in a sieve  shaker. The shaker shakes the column, usually for some fixed amount of time. After the shaking is complete the material on each sieve is weighed. The weight of the sample of each sieve is then divided by the total weight to give a percentage retained on each sieve.

The size of the average particles on each sieve then being analysis to get the cut-point or specific size range captured on screen. 

Vibration Sieve shaker 
A strong and powerful electro magnet creates a strong and reproducible Vibration. The vibration is transported via a package of flat springs to the sieve base plate and accordingly to the sieve stack.
A representative weighed sample is poured into the top sieve which has the largest  opening. The material is separatedDue to the 3 dimenmsional movement of the sieve shaker. 

Adjustment of sieve paratmeters
The required sieving time, the suitable amplitude and the intervall function can be pre-selected comfortably and reproducibly by stepless adjustment via the ergonomical display.


Features and benefits 

Better performance due to  a strong 750 Watt drive

Optimum sieving result 

Suitable for Wet or dry sieving

Suitable for batchwise or continious sieving

For test sieves of up to 450mm diameter

CE certified

Sieving area 20µm up to 150 mm 

Under frame (option)

All sieving parameters can be pre-selected digitally

Intervall sieving function selectable

Optimum performance due to ergonomical display 

Memory function to store Sieving parameters