1. Hygiene: From a safety perspective, packaging materials that are in direct contact with food, such as plastic packaging bags. Due to the frozen food bags and transportation process, it is often difficult to ensure that the entire process is in a coherent low-temperature environment, especially during the transportation and transportation process, which may cause the temperature of the frozen food to rise significantly over a period of time. If the material does not pass, it is easy to breed bacteria. There is not much difference in appearance between packaging made of recycled materials or industrial-grade materials and packaging made of materials, but once used, it will cause great harm to human health due to excessive plasticizers and other substances.
2. Cold resistance: Frozen food bags are usually stored and circulated at a temperature of -18°C or lower, especially some frozen foods with trays. In the production process, food and trays are usually quickly cooled to below -30°C until the product temperature is below -18°C, and then packaged. In the case of a sudden temperature drop, the mechanical strength of the frozen food bag packaging material will also decrease, resulting in the brittleness of the frozen food bag material. Moreover, frozen foods are inevitably exposed to various environmental hazards such as shock, vibration, and pressure during transportation and transportation. In addition, frozen foods such as dumplings and dumplings are relatively hard at low temperatures. It is easy to cause the packaging bag to crack. This requires packaging materials with good low temperature performance.
3. Impact resistance: Frozen food bags are 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 the bag and open the bag, which not only affects the appearance of the packaged product, but also contaminates the food inside. The impact resistance of frozen food bags can be determined by the pendulum impact test.
Frozen food bags on the market can be divided into single-layer packaging bags, composite packaging bags, and multi-layer co-extrusion packaging bags. Among them, single-layer frozen food packaging bags, that is, pure PE bags, have poor barrier effects and are mostly used for fruit and vegetable packaging; composite soft plastics are relatively good in terms of moisture resistance, cold resistance, and puncture resistance; and multi-layer co-extrusion bags Frozen food bags are produced by melt-extruding raw materials such as PA, PE, PP, PET, EVOH, etc., with different functions, blow molding, and cooling compound. The packaging performance has high barrier, high strength, high and low temperature resistance, etc. Excellent characteristics.
Post time: Jun-07-2021