When choosing packaging materials for frozen food packaging bags, the first thing to do is to study the sensitive factors that affect the main components of frozen food, especially nutrients such as fat, protein, and vitamins. These include light, oxygen, temperature, microorganisms, and physical and mechanical factors. Then, according to the protection requirements of the contained food and the transportation environment, determine the type of frozen food packaging bag and the operation mode of the packaging technology to achieve the purpose of protecting the function and extending the storage period appropriately.Hygiene: From a safety point of view, packaging materials that are in direct contact with food, such as plastic packaging bags, must meet food grade. Due to the packaging and shipping process of frozen foods, it is often difficult to ensure a consistent low temperature environment throughout. Especially during transfer and transportation, the temperature of frozen food is likely to increase significantly for a period of time. If the material is not sealed, bacteria can easily breed. Packaging made of recycled materials or industrial-grade materials is not much different in appearance from packaging made of food-grade materials, but once used, it will cause great harm to human health due to excessive plasticizers and other substances hazards.Cold tolerance: Frozen foods are usually-18℃ or lower temperature storage and circulation, especially some frozen foods with trays. During production, food and trays are usually-30℃ rapid cooling until the core temperature of the product is lower than-18℃, then packed. In the case of a sudden drop in temperature, the mechanical strength of the packaging material is also reduced, causing the packaging material to be fragile. In addition, frozen food is inevitably subjected to various environmental hazards during transportation, such as shock, vibration, pressure, etc.Impact resistance: Frozen food is easily damaged by external forces during transportation, loading and unloading, and shelf placement. When the impact resistance of the packaging bag is poor, it is easy to break and open the packaging bag, which will not only affect the appearance of the packaged product, but also pollute the food inside. The impact resistance of frozen food packaging bags can be determined by the pendulum impact test.Heat seal strength: If the heat seal strength of the frozen food packaging bag is insufficient or not sealed, a slight impact can cause the seal to crack. If the heat sealing temperature is too high, it is easy to damage the heat sealing layer and weaken the strength of the material at the sealing line. Once subjected to strong vibration or impact, it is easy to cause the bag to break and a large area of the bag to break, so the food inside cannot be effectively protected.Tensile force, interlayer peeling strength: If the peeling strength between the layers of the frozen food packaging bag is small, the tensile breaking force is not enough, and the mechanical properties of the packaging bag are poor, which will easily lead to delamination of the packaging bag and fail to achieve the proper load-bearing function , thereby reducing the protective performance of the packaging bag and greatly shortening the shelf life of the food contained therein.Puncture resistance: frozen foods are often hard, especially fish and meat products, which contain bones and hard objects. During transportation and stacking, the product is easy to puncture the packaging bag after being squeezed, thus destroying the sealing performance of the frozen food packaging bag. Therefore, frozen food requires high puncture resistance of packaging bags.Compression resistance: During transportation and handling, transport packaging and even internal sales packaging will be damaged by vibration, drop or impact, so frozen food packaging bags should undergo relevant vibration or drop tests. Finally, choose packaging materials that can not only protect the quality of frozen food, but also reflect its commodity value, so that the overall packaging cost is reasonable.
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