What kind of packaging bag is the safest for frozen food?

Safety is a crucial consideration in the packaging selection of frozen foods. Here are some suggestions for choosing frozen food packaging bags to ensure the safety of food during storage and transportation.

Firstly, food grade raw materials are the primary consideration for frozen food packaging bags. Packaging materials must meet food grade standards to avoid the use of recycled or industrial grade materials that may affect food safety. Polyethylene (PE) is a common food grade plastic bag material with high transparency, good toughness, strong cold resistance, and can withstand temperatures up to -70 ℃. Therefore, it is often used to make frozen food packaging bags.

Secondly, cold resistance is another important characteristic of frozen food packaging bags. Due to the fact that frozen foods are typically stored in sub zero environments, packaging materials need to have good cold resistance to maintain their mechanical strength and prevent them from becoming brittle or breaking in low temperature environments.

In addition, impact resistance and puncture resistance are also factors to consider when choosing frozen food packaging bags. Frozen foods may be subjected to external impacts during transportation and loading/unloading, therefore packaging bags need to have a certain degree of impact resistance. At the same time, frozen food is generally harder and easier to break through packaging bags, so the puncture resistance of packaging bags is also crucial.

In terms of material structure, packaging bags with OPP/LLDPE, NY/LLDPE, PET/LLDPE, and PET/NY/LLDPE structures are more common in the market. The product performance of these structures can meet the requirements of moisture resistance, cold resistance, and strong low-temperature heat sealing tension, and the cost is also relatively economical. Especially for packaging with NY/LLDPE structure, its freeze resistance, impact resistance, and puncture resistance are good, but the cost is relatively high, making it suitable for packaging products with sharp edges or heavy weight.

Finally, mechanical properties such as heat sealing strength, tensile strength, and interlayer peel strength are also important indicators for evaluating the safety of frozen food packaging bags. Insufficient heat sealing strength or high heat sealing temperature of packaging bags can lead to poor sealing and affect the protective performance of the packaging bags. The mechanical properties such as tensile strength and interlayer peel strength of packaging bags are poor, which can easily lead to delamination and inability to achieve the expected load-bearing capacity.

In summary, when choosing frozen food packaging bags, priority should be given to food grade raw materials, cold resistance, impact resistance, puncture resistance, as well as mechanical properties such as heat sealing strength, tensile strength, and interlayer peel strength. In the market, packaging bags with OPP/LLDPE, NY/LLDPE and other structures can be chosen to ensure the safety of frozen food during storage and transportation.