Center of expertise - Cold grinding and recycling
Cold grinding & recycling at the highest level
Messer operates a highly-specialised technical center for cold grinding in Willich, Germany. Its technology features a special counterrotating peg mill and a tumble screen which allow very fine grain sizes to be achieved when grinding with liquid nitrogen – something that is not possible with conventional procedures. The extremely low temperature of the nitrogen makes it much easier to crush, say, thermoplastic materials in the mill. This also prevents agglutination.
The precisely measured and evaluated results from Willich can be transferred to industrial procedures. Plus the layout of the plant is the same as that of a production plant and can therefore be used as a reference. Fine grinding of synthetic materials or natural products, such as spices, is an art which the Messer Group has mastered. Messer therefore has a technical center for cryogenic grinding in Germany that is open to customers of all the subsidiaries for the purposes of carrying out tests.
Cold grinding and recycling with Messer
Many materials are easier to use and much more effective in a powder form.
However, it is often the case that they cannot easily be powdered due to their physical properties. These properties include the tendency to melt, sensitivity to changes in temperature and showing tough or elastic properties. This often occurs with plastics, natural rubbers, elastomers, pharmaceuticals and spices.
Cold grinding solves these problems
The cold grinding process involves cooling and embritteling of materials with extremely cold liquid nitrogen or carbon dioxide. The process results in production of fine particles with a high level of quality. In addition, process volumes increase significantly. During the grinding process heat sensitive materials are cooled with cryogenic gases in order to protect them from increases in temperature resulting from the heat generated by the process. This means that it is impossible for the powdered material to melt or become sticky.
The Messer Group’s cold grinding and recycling lab offer the customer tailor made solutions including production cost estimates and pilot trials.