The cryogenics grinding
Cryogenics grinding applies to deformable materials with an elastic or ductile behaviour such as plastics and polymers, metals and even organic compounds. It enables their micronization when other techniques (shredding, granulation) are limited.
It requires the cooling of materials under their glass transition temperature (often under -100°C), rendering them brittle and suitable for grinding using a compression or percussion/impact technique.
This is done by transiting materials in a chilled conveying screw using liquid nitrogen before the grinding.
CTP has a cryogenization facility with the following specifications:
CTP has a cryogenisation facility with the following specifications:
Principle – Thermal transfer channel by direct contact with liquid nitrogen | |
Useful length | 3000 mm |
Internal diameter | 160 mm |
Nitrogen injector | 4 injectors |
Nitrogen pressure | 2 to 4 bar |
Nitrogen consumption | ~ 100 litres/h |
Nitrogen tank | 1000 litres |
Feed particle size | < 25 mm |
Feed rate | ~ 200 kg/h |
