Selection criteria for frozen food packaging bags

Customers who often need frozen food packaging bags find us, including dumplings, noodles, ham and pot bottom materials. Generally, customers think that all products that need to be frozen use the same products. However, the actual situation is quite different. Now let's take a look at what kind of frozen food packaging bag our products are suitable for. When choosing packaging materials for frozen food packaging, the first thing to do is to study the main components of frozen food, especially the sensitive factors affecting fat, protein, vitamins and other nutrients, including the effects of light, oxygen, temperature, microorganisms, and physical and mechanical aspects. factor. Then, according to the protection requirements of the contents and the transportation environment, the type of packaging materials and the operation mode of packaging technology are determined to achieve the protection function and the purpose of extending the storage period appropriately. 1. Hygiene From the perspective of safety, packaging materials that are in direct contact with food, such as plastic packaging bags, must reach food grade. Due to the packaging and transportation of frozen food, it is often difficult to ensure that the entire process is in a consistent low-temperature environment. Especially in the process of transfer and transportation, it is very likely that the temperature of frozen food will rise significantly within a period of time. If the materials are not approved, It is easy to breed bacteria. The appearance of packaging made of recycled materials or industrial-grade materials is not much different from that of food-grade materials, but because it contains excessive plasticizers and other substances, once used, it will cause great harm to human health. 2. Cold-resistant frozen foods are usually stored and circulated at -18°C or lower, especially some frozen foods with trays. During the production process, the food and trays are usually cooled rapidly at -30°C or lower until the product is produced. The core temperature is below -18°C before packaging. In the case of a sudden drop in temperature, the mechanical strength of the packaging material also decreases, causing the packaging material to be fragile. Moreover, frozen food will inevitably suffer from shock, vibration, pressure and other environmental hazards during the transfer and transportation process. In addition, frozen foods such as glutinous rice balls and dumplings are hard in texture under low temperature conditions. It is easy to cause the packaging bag to rupture and crack. This requires good low-temperature performance of packaging materials. 3. 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 bag, which not only affects the appearance of the packaged product, but also At the same time, the food inside will be contaminated. The impact resistance of the packaging bag can be determined by the pendulum impact test. 4. Heat-sealing strength If the heat-sealing strength of the packaging bag is not enough or is not sealed, a slight impact can cause the sealing part to crack; if the heat-sealing temperature is too high, it will easily cause damage to the heat-sealing layer and weaken the material strength at the sealing line , Once it is subjected to strong vibration or shock, it is easy to cause bag breakage and large area rotten bag phenomenon, and it is impossible to achieve effective protection of the food inside. 5. Tensile strength and interlayer peeling strength. If the interlayer peeling strength of the packaging bag is small and the tensile strength is insufficient, the mechanical properties of the packaging bag will be poor, which will easily cause the packaging bag to layer and fail to achieve the due load-bearing effect, resulting in packaging The protective performance of the bag is reduced, which greatly shortens the shelf life of the food inside. 6. Puncture-resistant frozen foods are generally harder after freezing, especially fish and meat products, which contain bones and hard objects. After the product is squeezed during transportation and stacking, it is easy to pierce the packaging bag and seal the packaging bag. The performance is destroyed, so frozen food has high requirements on the puncture resistance of the packaging bag. 7. Compression resistance during transportation and handling will cause harm to the transportation packaging and even the internal sales packaging due to vibration, drop or impact, so relevant vibration or drop tests should be carried out on frozen food packaging. In the end, choose packaging materials that can not only protect the quality of frozen food, but also reflect its commodity value, and make the overall packaging cost reasonable. Please indicate the source for reprinting: www.crj88.com
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