Spices and herbs are natural products, the mechanical processing of which merely alters the shape while ensuring that any negative impact is kept as low as possible. The successful processing of spices and herbs places complex requirements on the processing chain and is one of the most difficult tasks of size reduction technology.
Every process is individual and depends on both the customer requirements and the diversity of product properties. Important factors are the hardness, size, colour, oil content, shear resistance and viscosity of the spices, medicinal herbs, dried vegetables or roots that are to be processed. In addition, quality fluctuations due to their natural origin must be taken into account.
Within the process, this means that wear, temperature changes, fire and explosion risks must be considered. In this connection, the essential oil content plays an important role. It dictates the later market value as well as the aroma intensity in the final application. Because of this, spices require very "gentle" processing, for example by means of cryogenic grinding with nitrogen or conditioned air.