Animal Feed Flour

With the 0,75 mm sieve ring, sample 1 got ground successfully within 30 seconds. Only a small amount of sample residue use to stick lightly to the lid and top side of the sieve ring. A grinding of higher amounts might be possible. For a grinding of > 50 g of sample, we recommend grinding batch wise or using the accessories for grinding large quantities. With filter bags made of paper, a grinding of 100 g of sample as desired should be possible.

In our second trial, we used a 0,5 mm sieve ring instead of 0,75 mm. The complete amount of 25 g of sample has been fed within 40 seconds. Afterwards, it has been observed that the sample used to block about 1/3 of the sieve rings trapezoidal openings.

We are guessing that the sample humidity, or content of fat will be too high for a proper grinding. The usage of the accessories for grinding large quantities might improve the result lightly, but we don’t expect that 100 g of sample can be ground without a cleaning step in between.

Because humidity of sample should be checked after grinding, a previous embrittlement in liquid nitrogen is not possible to support the grinding process. Chilled sample will lead to a condensation of humidity which will falsify a later analysis.