At present, the common frozen food packaging bag
s on the market mostly use the following material structures: 1. PET/PE This structure is relatively common in quick-frozen food packaging, with good moisture-proof, cold-resistant, low-temperature heat-sealing performance, and relatively low cost. 2. The structures of BOPP/PE and BOPP/CPP are moisture-proof, cold-resistant and low-temperature heat-sealing with high tensile strength and relatively economical cost. Among them, the appearance and feel of the packaging bag of BOPP/PE structure are better than that of PET/PE structure, which can improve the product quality. 3. PET/VMPET/CPE, BOPP/VMPET/CPE and other structures have fine surface printing due to the existence of aluminized layer, but the low temperature heat sealing performance is slightly poor and the cost is high, so the usage rate is relatively low. 4. The packaging of NY/PE, PET/NY/LLDPE, PET/NY/AL/PE, NY/PE is resistant to freezing and impact. Due to the existence of the NY layer, its puncture resistance is very good, but the cost Relatively high, generally used to package angular or heavier products. In addition, there is also a simple PE bag, which is generally used as an outer packaging bag for vegetables and simple frozen food. In addition to packaging bags, some frozen foods need to use plastic trays. The most commonly used tray material is PP. Food-grade PP is hygienic and can be used at a low temperature of -30 °C. There are also PET and other materials. As a general transport package, corrugated boxes are the first consideration for frozen food transport packaging due to their shock resistance, compression resistance and cost advantages.
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