Cold resistance (low temperature resistance) of functional design of flexible packaging
Due to the regional and seasonal differences in the sales of packaging bags, and some packaging bags need to be frozen and refrigerated at low temperatures (generally, the storage conditions at -30°C ~ -20°C are called cryopreservation, while at -5°C The storage condition of ~0°C is called refrigerated storage), and cold resistance (low temperature resistance) is a key characteristic of the packaging material at this time.
The temperature dependence of the impact resistance of the material is obvious. At low temperatures, the impact strength drops sharply due to the increased brittleness of the material; on the contrary, at higher test temperatures, the impact strength increases significantly. In addition, humidity also affects the impact strength of some materials. For example, when the humidity is high, the impact strength of nylon plastics increases greatly, while the impact strength is very low in the absolute dry state. For example, some OPP//CPP packaging bags may increase the breakage rate during transportation and handling in cold winter seasons, and even some manufacturers use cast CPP instead of blow-molded IPP to improve the partial drop resistance and impact resistance of the packaging bags.
