Fine grinding using cryogenic grinding technology
Fine powders with a big impact
Cold grinding technology reduces production costs and simultaneously increases product quality.
During cold grinding the materials to be ground are cooled and embrittled with cryogenic liquid nitrogen or carbon dioxide. Cooling of heat sensitive materials with cryogenic gases during the grinding process prevents their temperature from rising through the heat released during the grinding process. This eliminates material melting and sticking.
With the right grinding technique this also allows for finer products of a better quality and a significantly higher throughput than with classical grinding processes; even with tough and elastic products such as thermoplastics and elastomers. Materials with a low softening point (hot melt adhesive, bitumen) can be equally well ground. In the case of spices, high grinding temperatures lead to loss of aroma and flavour; mill cooling means that the product is treated gently and a significantly higher share of the essential oils are conserved. In the case of other food stuffs, vitamins and proteins are retained.
Products with a high oil or fat content (nutmeg, oilseed, meat meal) can quickly cause blockages in the grinding tools and chamber. Cooling with cryogenic gases keeps the product free-flowing so that it leaves the mill without clogging it.
This means, due to the cold grinding technology production costs will be reduced while increasing the product quality.
Cryogenic composite material separation
Different materials have different coefficients of linear thermal expansion and embrittlement capabilities; cold grinding technology utilises this to separate composite materials (fibre reinforced thermoplastics, galvanised plastic parts, old tyres etc.) into their component parts or from their accompanying substances.
Inertisation of mills
Nitrogen or carbon dioxide displaces oxygen to create an inert atmosphere which protects against fire or explosion. The milling of combustible products and those having a dust explosion risk is made significantly safer.
We are happy to provide you with background information, benchmark data and a list of suppliers for mills, spare parts and products related to cold grinding. You may contact our specialists directly and arrange trials for your product.