CO2 and LN2 are used as the cooling agents. The product andthe system are cooled either by direct injection of the cooling agent into the mill or,if longer residence times or lower temperatures are necessary, by pre-cooling andembrittlement of the material in a screw cooler.Because cryogenic grinding reduces the loss of essential oils (approx. 3 - 10% loss)in comparison to grinding at normal temperature (approx. 15 - 43% loss), it is possibleto improve the aroma and flavour. In addition, the grinding performance isabout twice as high and the risk of fire is eliminated.

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