|Agriculture and forestry|
|90.0 % < 4.0 mm|
|Usage of a Cutting Mill PULVERISETTE 15 is possible. A Universal Cutting Mill PULVERISETTE 19 would be beneficial when higher sample numbers are ground on a daily basis (faster cleaning and longer durability of the equipment).|
rotor: Rotor with straight cutting edges
optional accessories: Funnel for long and bulk solids
sieve insert: 1 mm trapezoidal perforation
material: hardened stainless steel
||(max. length) 60 mm|
||1,5 - 3 min|
||(up to ~ 5 mm length) < 1 mm|
With a diameter of < 30 mm, also a feeding into our standard funnel for long and bulk samples is possible. We used a sieve insert with 1 mm trapezoidal perforations. This way, wood fibers might pass longitudinal and should be found with a majority of output < 4 mm length. Surely it is possible to use larger perforated sieve inserts as well (when just < 4 mm sieve fraction is required).
The presented wood sample was dried enough and softer than usual. Three advantages of our Universal Cutting Mill PULVERISETTE 19 are the easy to clean grinding chamber (fastening of the grinding chamber with only one lever) and a longer durability of our Standard rotor with V-cutting edges and fixed knives made of hardened stainless steel. Finally, also the dead space inside the grinding chamber is much smaller and even less residues would be found after comminution.
We prepared a batch of 80 grams and slowly transferred the sample in small amounts into the grinding chamber. The grinding sound was typical and feeding was finished after ~ 70 seconds. After 90 seconds of grinding, already 58 grams of output was found inside the collecting vessel. We proceeded grinding until a total grinding time of three minutes was applied. The output only improved by 7 grams. After a total grinding time of five minutes, only two more grams of output was found inside the collecting vessel. Still > 10 grams of precut sample remained loose indie the grinding chamber. We would recommend feeding about 20 grams more of desired sample amount and run the mill only slightly longer.
Majority of residues were removed rapidly by vacuuming with a soft brush. Because the perforations of the bottom sieve were not clogged significantly (< 5% for sure), even higher amounts (1 liter as mentioned ~ 200 grams of bulk material) are grindable this way, too.
|Pictures:||The original sample start size.|
|Opened grinding chamber after a total grinding time of five minutes. Residues were removed rapidly by vacuuming with a soft brush.|
|The ground sample which passed the 1 mm trapezoidal perforated sieve cassette. Also pieces with a length up to ~ 5 mm were found inside the collecting vessel.|