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Wool

Protocol number:	M210076
Industry:	Biology, Agriculture and forestry, Environment
Feed Size:	20 cm
Desired Fineness:	< 0.2 mm
Quantity:	10.0 g
Recommendation:	The desired Variable Speed Rotor Mill PULVERISETTE 14 premium line can be used for grinding of wool. We recommend to convert the mill into a cutting mill.

Result 1

	Variable Speed Rotor Mill PULVERISETTE 14 premium line speed: 18000 revolutions per minute
Equipment:	rotor: Cutting Rotor optional accessories: High-performance cyclone separator sieve ring: Sieve ring 1,0 mm trapezoidal perforation material: stainless steel
Material attributes:	Pre-cutting to < 1 mm
Feed quantity:	10 g
Feed Size:	20 mm
Grinding time:	40 seconds
Final fineness:	1 mm
Comments:	With a max. length about 20 cm, the original wool sample was way too large to be ground with the desired Variable Speed Rotor Mill PULVERISETTE 14 premium line. We used a standard paper scissors to precut the wool into smaller fragments about 20 mm length / width. Grinding should be performed in two steps to avoid a clogging of fine perforated sieve shells. We used a sieve shell set with 1 mm trapezoidal perforations with the 10 grams of precut sample. 40 Seconds were required to comminute the complete batch of sample. About 9,4 grams of output was found inside the collecting glass of the high-performance cyclone separator. Only a bit of electrostatic charged residue was left inside the grinding chamber. There was not clogging of perforations or a blockage of the knives. Surely higher amounts of sample can be ground this way, too. Cleaning was performed rapidly by vacuuming with a soft brush.
Pictures:	The original sample was too large to be fed into a Variable Speed Rotor Mill.
	Example of the precut wool.
	After comminution, only a few particles were left inside the grinding chamber. Cleaning was performed rapidly by vacuuming with a soft brush.
	Precut sample which passed the 1 mm sieve shells. A max. length about 10 mm was spotted.

Result 2

	Variable Speed Rotor Mill PULVERISETTE 14 premium line speed: 18000 revolutions per minute
Equipment:	rotor: Cutting Rotor optional accessories: High-performance cyclone separator sieve ring: Sieve ring 0,20 mm trapezoidal perforation material: stainless steel
Material attributes:	Fine Grinding
Feed quantity:	9 g
Feed Size:	1 mm
Grinding time:	70 seconds
Final fineness:	200 µm
Comments:	Precut sample material of result one was used for this trial. The grinding was performed analogue result 1; only the sieve shell holder was replaced against a holder which was equipped with a sieve shell set with 0,2 mm trapezoidal perforations. The sample was slowly transferred into the grinding chamber. It took 70 seconds until the complete sample material was fed and ground. The grinding sound while feeding was typical. Afterwards, only a small amount of sample remained loose inside the grinding chamber. This sample was pushed into the channel of the cyclone while the sample exhauster remained switched on. This way, all ground sample material was merged inside the cyclones collecting glass. 8,5 grams of output was packed after our trial. Because fibers passed the perforations of the sieve shells longitudinal, we still found fibers with a length about 2-3 mm. There was no significant clogging or smearing of sample. Surely even higher amounts of sample can be ground this way, too. Cleaning was performed rapidly by vacuuming with a soft brush. Compressed air can be very helpful to blow out residues of the sieve shell holder.
Pictures:	Opened grinding chamber after comminution. No significant clogging of sieve shells was spotted. Higher amounts could be ground.
	Output which passed the 0,2 mm sieve shells. The max. length of fibers was about 3 mm after grinding.

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