The mixer mill MM 400 is a compact versatile benchtop unit which has been developed specially for dry wet and cryogenic grinding of small amounts of sample It can mix and homogenize powders and suspensions in only a few seconds It is also perfectly suitable for the disruption of biological cells as well as for DNARNA and protein extraction... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.
The knife mill GRINDOMIX GM 200 is perfectly suited for grinding and homogenizing foodstuff and feedstuff It accepts sample volumes up to 07 liters and homogenizes substances with a high water oil or fat content as
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The Planetary Micro Mill PULVERISETTE 7 classic line operates with two grinding bowls of sizes 12 ml or 45 ml which turn with a transmission ratio 1 2 relative to the main disk To achieve best grinding results and for direct prevention of contamination of the samples due to undesired abrasion grinding bowls and grinding balls are available in 7 different materials
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The cutting mill is used successfully for a great variety of materials The sample is only moderately warmed up during the grinding process so that the mill is perfectly suitable for grinding temperaturesensitive materials Another innovation is the wide freely selectable speed range from 100 to 3000 min1
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FRITSCH Planetary Ball Mills – highperformance allrounder in routine laboratory work The Planetary Mill PULVERISETTE 5 premium line with 2 grinding stations is the ideal mill for fast wet and dry grinding of hard mediumhard soft brittle and moist samples as well as for mechanical alloying mixing and homogenising of larger sample quantities with reliable results down into the nano
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Several investigations indicated that variations of the surface energy of solids and the degree of dispersion are the main factor when dry and wet grinding systems are compared It was documented that in a wet grinding system by increasing the percentage of solids part of the energy is converting to the surface energy and dry ground samples have higher surface energy than wet ground ones
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A preliminary size reduction is carried out for the sample materials of large feed sizes Following this a small part of the sample is subjected to fine grinding Dry and bulk samples can be introduced into the rotating dividers through vibratory feeders for grinding Sample
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When a sample is dry ashed a fine residue ash is often formed The small particles in the residue are resuspended readily by any air flow over the sample Air flows are generated by changes in temperature eg opening the furnace while it is hot or by passing a stream of gas over the sample during heating to assist in combustion
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If the sample detaches at the prepared surface plane then the bond was the weakest point in the system indicating a surface preparation problem When the bond holds but the concrete fractures at less than 10 of the expected compressive strength of the concrete it’s
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To avoid contamination of the grindingpolishing surface through large abrasive particles from a previous step clean the samples and sample holder carefully after every step If there are still scratches left over from the previous step after finishing the current step increase the preparation time by 25 to 50 as a
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