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cocoa -pellets

Protocol number:	M004018
Industry:	Biology, Foodstuffs
Feed Size:	~ 1 cm
Desired Fineness:	d90 < 150 µm
Quantity:	75g
Recommendation:	The pellets can be ground with our Planetary Mono Mill PULVERISETTE 6 classic line. By dry grinding, a d90 < 105µm can be achieved.

Result 1

	Planetary Mono Mill PULVERISETTE 6 classic line main disk speed: 600 rpm
Equipment:	250 ml grinding bowl made of ZrO2 + 15x 20 mm ZrO2 Ø grinding balls
Feed quantity:	75 g
Feed Size:	app. 1 cm
Grinding time:	4 min
Final fineness:	d50 <22,4 µm d90 <104,5 µm
Comments:	Sample can be ground for 4 minutes. Afterwards, pellet pieces start sticking lightly to bowl and balls. Usually, particles will start sticking to bowl or balls when the majority of particles reached a fineness of < 20-30µm. Interacting forces between fine ground particles will become bigger as their own g-force. Therefore, particles will stick to each other and just become compressed by the used grinding balls. These clusters of particles also contain bigger particles which will not be ground any further too. By checking the fineness afterwards, d50 < 22,4µm and d90 < 104,5µm has been found (detected with Laser Particle Sizer ANALYSETTE 22 NanoTec). Desired fineness is already reached. If a better endfineness should be achieved, a grinding in suspension is obligate.