Particle size

Analysis

Dry Sieving Method:
A measured quantity of material is placed on the top (coarsest) sieve of one or more stacked sieves. By vibrating, the material is distributed across the sieves. The sieve fractions are weighed per sieve. The percentage of sieve fraction in relation to the original material is calculated.

Wet Sieving Method:
A suspension is made from a measured quantity of material using water, and it is placed on the top (coarsest) sieve of one or more stacked sieves. By vibrating and spraying water, the material is distributed across the sieves. The sieve fractions are dried and weighed. The percentage of dried sieve fraction in relation to the original material on a dry matter basis is calculated.

Fineness:
If the material is hygroscopic (tends to stick) or if the sieve fractions are very fine, it is possible to determine the fraction using an air jet sieve machine. A measured quantity of material is placed on a sieve, and with the use of negative pressure combined with an airflow through a rotating nozzle, the material is pulled through the sieve. The material remaining on the sieve is weighed, and the percentage of material that passed through the sieve can now be calculated.

Product matrix

• Feed products and raw materials
• Milk and dairy products
• Food products
• Additives