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Food industry
Release date:
2025-03-25 13:59
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3.1 Food Processing Stage: Vacuum Evaporation and Concentration Technology
In the food processing industry, particularly for concentrating liquid foods like juices and syrups, vacuum evaporation technology has gained widespread adoption due to its unique advantages. Take juice concentration as an example: traditional high-temperature evaporation methods often damage heat-sensitive components in juice, such as vitamins and aromatic compounds, leading to nutrient loss and altered flavor profiles. In contrast, vacuum evaporation technology uses a vacuum pump to reduce the pressure within the evaporation system, enabling liquids to boil and evaporate at temperatures far below their normal boiling points. For instance, in orange juice production, vacuum evaporation is employed to concentrate the juice. At a vacuum level of -0.09 MPa, orange juice begins to boil and evaporate around 50°C—significantly lower than the boiling point under standard atmospheric pressure. This approach not only saves substantial energy compared to conventional high-temperature evaporation but also ensures that vital nutrients like vitamin C are preserved as much as possible. As a result, the concentrated orange juice retains a flavor profile remarkably similar to freshly squeezed juice, greatly enhancing the overall quality of the final product.
3.2 Food Packaging Stage: Vacuum Packaging and Vacuum Nitrogen-Filled Packaging
(1) Vacuum packaging
Vacuum packaging is an extremely common preservation method in food packaging. The vacuum pump plays a crucial role in this process, extracting air from the package to create a low-oxygen or oxygen-free environment. This effectively inhibits the growth and reproduction of microorganisms, thereby extending the shelf life of food products.
Take meat products as an example: fresh meat left at room temperature without vacuum packaging will develop unpleasant odors and spoil within just 1–2 days due to microbial activity. However, when properly vacuum-packed, it can stay fresh for 7 to 10 days under suitable storage conditions.
For instance, commonly available vacuum-packed sausages on the market are processed using a vacuum pump that reduces the internal air pressure to approximately -0.08 MPa. This not only prevents oxidation and rancidity but also minimizes the risk of oil-off flavors caused by lipid degradation. Additionally, vacuum packaging significantly lowers the chances of mold growth and pest infestation, ensuring consistent product quality throughout its shelf life.
(2) Vacuum Nitrogen Packaging
In high-end food packaging The application of vacuum nitrogen packaging is becoming increasingly widespread across various industries. The process involves first using a vacuum pump to remove air, followed by the injection of nitrogen gas. As an inert gas, nitrogen boasts stable chemical properties, effectively eliminating residual oxygen and inhibiting the growth of oxygen-dependent microorganisms. For instance, when applied to packaging for a premium brand of nuts, vacuum nitrogen technology significantly reduces oxidative rancidity in the product. At a vacuum level of -0.095 MPa combined with nitrogen filling, the peroxide value of the nuts drops dramatically, extending their shelf life from the typical 3–6 months to an impressive 12–18 months. This innovative approach not only enhances product freshness but also meets consumers' growing demand for high-quality, long-lasting nuts.
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