What are the reasons why the bags of quick-frozen or frozen food are prone to breakage?

What are the reasons why the bags of quick-frozen or frozen food are prone to breakage? Quality problems: Some quick-frozen foods have a certain percentage of bags broken (broken at the non-sealed parts) during storage, transportation, and sales. Reason analysis:-packaging materials have poor cold resistance-packaging materials at low temperatures, the flexibility decreases, the brittleness increases, and the impact resistance deteriorates. For example, in the pendulum impact test, the impact energy of the same material before and after freezing differs greatly. Poor flexibility-the packaging material has poor flexibility under normal conditions, low elongation deformation rate, and high stiffness, resulting in finished packaging under a certain internal gas pressure, the packaging material is not easy to produce a certain tensile deformation, and it is easy to form resistance. Cause the bag to rupture. Expert advice:-Pay attention to the tensile, elongation and elastic modulus of food packaging bags, pendulum impact energy, cold resistance, drop resistance, burst pressure (positive pressure method) and other properties. ——Re-select packaging materials with better flexibility and cold resistance, or improve the quality of existing food packaging bag materials.
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