Powtech 2017: Cold grinding, recycling and flash freezing with cryogenic gases from Messer
The largest privately run industrial gases specialists, Messer, will be exhibiting their cryogenic grinding techniques from 26 to 28 September 2017 at the Powtech trade fair in Nuremberg. In Hall 4A, Stand 4A-531, the industrial gases manufacturer will be demonstrating the advantages of liquid nitrogen and carbon dioxide as a coolant during cold grinding and will provide information on cryogenic equipment for product and mill cooling.
The areas of application for these materials could hardly be more varied. However, cold grinding and flash freezing for bulk solids are always adapted to a variety of conditions. With Messer’s cryogenic techniques it is possible for a wide range of different materials to be finely ground or recycled by using cryogenic gases, such as nitrogen or carbon dioxide. Such materials include thermoplastics, elastomers, waxes and paint additives, as well as spices which would otherwise lose their flavours due to the high temperatures in grinding processes.
Furthermore, bulk solids and pourable food products can be flash frozen in paddle screws using cryogenic gases supplied by Messer to extend their shelf life or improve their quality. This application is cheaper and more efficient than conventional techniques.
During the cryogenic grinding process, the materials to be ground are cooled with liquid nitrogen or carbon dioxide to make them brittle resulting in a particularly fine grain. This allows composite materials to be separated into their individual components in a cost-effective and environmentally friendly manner. Messer is an international supplier of cryogenic gas applications for the manufacture of powders and supplies all the gases and hardware required from a single source.
At the Powtech 2017 the industrial gases manufacturer will be showing grinding samples from the rubber and elastomers, foods and spices, thermoplastic polymers and composite material separation processing sectors, among other things.
- Messer's cryogenic processes use cryogenic gases, such as nitrogen and carbon dioxide, and allow a wide range of different materials to be pulverised or recycled.
- Bulk solids and pourable food products can be flash frozen in paddle screws with cryogenic gases from Messer. During the cryogenic grinding process, here the materials to be ground are cooled and then fed into the mill together with nitrogen or carbon dioxide, thereby cooling the entire grinding process occurring within the mill.
- Scheme of the cold grinding process