Effects of humidity changes on packaged food

The relative humidity conditions in the ambient atmosphere during food packaging have an important impact on moisture-proof packaging; if the product is moisture-proof packaging under higher temperature and humidity conditions, it may accelerate the deterioration of the food. There are two reasons for the change of humidity in the package. One is that the humidity in the package increases due to the moisture permeability of the packaging material; the other is caused by the change of ambient temperature and humidity. When the relative humidity is determined, the absolute water content in the atmosphere is high when the temperature is high, and the relative humidity will increase when the temperature decreases. When the temperature drops to the dew point temperature or below, the water vapor in the atmosphere will reach a supersaturated state and moisture condensation will occur. . This temperature and humidity change is closely related to moisture-proof packaging. If the product is sealed in the package at a higher temperature, its relative humidity is allowed by the packaged product. When the ambient temperature drops to a certain extent, The relative humidity within the package has risen to a level that may exceed the conditions allowed for the packaged product. Therefore, the impact of environmental temperature and humidity on the packaging is still relatively large. The moisture absorption balance characteristics of each food are different, so the sensitivity to water vapor is also different, and the requirements for moisture-proof packaging are also different. Most foods are hygroscopic, and their hygroscopicity increases with the relative humidity of the environment until the moisture content is saturated. Each food product has an allowable relative temperature range of critical moisture and moisture absorption to ensure food quality. Within this range, the moisture content of the product can maintain its performance and quality until moisture absorption or evaporation reaches equilibrium. Beyond this humidity range, It will cause quality changes due to the influence of moisture. In addition to the environmental requirements for packaging, the sealing of the packaging is also required to be firm and air-tight. It is also important to choose an efficient and stable packaging machine. The packaging machine produced by Zhongshan Kenwei is designed to use air pressure sealing, which has completely changed the traditional packaging. The phenomenon that the sealing is not firm.
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