We need to first analyze the raw materials of container bags. As we all know, the main raw materials of container bags are polypropylene and polyethylene resin, one of which has a volume less than 3m ³， Flexible plastic containers with a safe load-bearing capacity of no more than 3 tons have a melting point of 165 ℃ and will begin to soften around 155 ℃; The temperature range for use is -30 ° C to 140 ° C. It can withstand corrosion from acid, alkali, salt solution, and various organic solvents below 80 ℃, and can decompose under high temperature and oxidation. Melting point of 85 ℃ to 110 ℃, with excellent low-temperature resistance performance; The minimum operating temperature of polyethylene can reach -100 ° C to -70 ° C, with good chemical stability and resistance to most acids and bases (not resistant to acids with oxidizing properties).
What is the temperature range for using container bags made of polypropylene and polyethylene?
According to the relevant provisions of the national standard GB/T 10454-2000, the temperature for cold resistance testing of container bags is -35 ℃. Place the container bag in a constant temperature box at -35 ℃ for at least 2 hours, then take out the test sample of the container bag, fold it in half at 180 degrees, and observe whether the base fabric material is damaged, cracked, or other abnormal situations. The heat resistance test temperature for container bags is 80 ℃. Apply a load of 9.8 N to the test sample, place it in an 80 ℃ oven for 1 hour, and immediately separate the two overlapping test pieces after removal. Check for any adhesion, cracks, or other abnormal conditions on the surface.
Based on the above experiments, we can conclude that container bags can be used in environments ranging from -35 ℃ to 80 ℃. In daily production use, we generally do not recommend long-term use in high and low temperature environments.
