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Food Chilling & Freezing

One of the key challenges in the food industry is the effective control or – even better – elimination of bacterial activities. One of the most effective weapons in the fight against bacteria is chilling and freezing.

When the temperature is lowered below freezing point, the growth of microorganisms decreases rapidly. This is due not only to the lowering of the product temperature, but also to the reduction in free liquid water activity – thus depriving microorganisms of the water they need to metabolise.

Chilling a food product reduces the risk of bacterial growth. Rapidly chilling (also known as flash freezing or cryogenic freezing) a product mitigates this risk even further.

Cryogenic freezing also maintains the natural quality of food. When a product is frozen, ice crystals are formed. The smaller and more evenly distributed the crystals, the better the quality and taste of the frozen product. The only way to ensure that small crystals form uniformly throughout the food product, both inside and outside the cells, is to quick-freeze the food at cryogenic temperatures.

In-Transit Refrigeration

One of the most effective ways of ensuring a temperature-controlled atmosphere is with cryogenic refrigerants such as liquid carbon dioxide (CO2) or nitrogen (N2). Unlike mechanical installations, cryogenic refrigeration provides on-demand, portable, silent and flexible constant temperature capabilities. A low noise factor can be a key advantage near residential areas in particular.

In addition, cryogenic refrigerants eliminate the need for harmful chlorofluorocarbon (CFC) refrigerants . Plus, an inert nitrogen atmosphere in the refrigerated space helps protect perishable goods and liquids against oxidation.

Cooling for Metal Fabrication

Many processing steps apply heat to the workpiece. This can affect dimensions and material structures. Cooling time is required to exclude the possibility of overheating. The cooling window can be reduced if carbon dioxide (CO2) snow or liquid nitrogen (LIN) are used as cooling agents.