Cryo Grinding
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Cryo Grinding
Cryo grinding and size reduction process technic that helps to retain natural value of food incredeents .freezing the food beyond its actual freezing point, while the inner part of the product remains warm. The product’s final temperature is not its temperature as it exits the cryogenic tunnel. Special cryogenic chemical reactors are used to remove reaction heat and provide a low temperature environment. The freezing of food productss requires nitrogen in blast freezing or immersion freezing systems have added to the shelf life and nutrient value.
To obtain the maximum refrigeration benefit, a typical CO2 system will inject throughout the length of the freezer. In LN2 systems, the N2 is sprayed into the freezer and separates as liquid and vapor. The vapor distribution through the freezer creates convective currents that increase the freezing rate.
To obtain the maximum refrigeration benefit, a typical CO2 system will inject throughout the length of the freezer. In LN2 systems, the N2 is sprayed into the freezer and separates as liquid and vapor. The vapor distribution through the freezer creates convective currents that increase the freezing rate.
Advantages : Cryogenic grinding of wheat flour, herbs and spices involves powdering these elements at sub-zero temperatures ranging from 0 to – 196°C. The elements are frozen with liquid nitrogen, as they are being ground. This process does not damage or alter the chemical composition of the main elements in any way. Standard grinding process which does not use a cooling system can reach up to +200°F. This high temperature can reduce volatile components and heat sensitive constituents in spices.
Superiority of Cryogenic over Standard Grinding Systems
| Traditional Grinding System | Cryogenic Grinding System |
| The heat is developed inside the grinding mill | Temperature below 0*c inside the grinding mill |
| The heat, which is developed during grinding, leads on one hand to evaporation of the essential oil and on the other hand, heat sensitive fats are melted. | Negligible loss of volatile component |
| This in turn can lead to the grinding elements become greasy (oily) and even harms the machine by blocking it. | Not in Cryogenic process |
| High energy consumption | Low energy consumption |
| High capacity motors are required to grind the material | Low capacity motors are required to grind the material |
| Essential value of material are evaporated | No evaporation of essential value |
| No control on particle size | Particle size are under controlled |
Essential Oil Content - cryogenically process over standard grinding process spices
| Spices | unground essential oil content ml/ gms | % | Cryo grinding essential oil content ml /gms | % | standard grinding essential oil content ml /gms | % |
| Turmeric | 3.5 | 100 | 5.5 | 100 | 3.5 | 64 |
| Coriander | 0.6 | 100 | 0.6 | 100 | .04 | 67 |
| Black pepper | 2.9 | 100 | 2.9 | 100 | 1.5 | 52 |
| Cumin garam | 3.5 | 100 | 3.5 | 100 | 1.6 | 46 |