Frozen food packaging bagss must meet the following conditions:
1. The inner packing plastics should have good function of water-proof and oxygen-proof.
2, the material must have good low temperature resistance, if the packaging material can not resistant low temperature, in the transportation and handling process, the protrusions of frozen food will pierce the packaging, causing leakage, accelerate food spoilage.
Frozen food packaging bags usually use high barrier and high strength materials. In addition, the low temperature resistance and mechanical strength of materials are improved by compounding and multi-layer coextrusion. The frozen food packaging bags are mainly divided into single layer bag, composite soft plastic bag, multi-layer coextrusion film packaging bag, edible packing film and so on.
Frozen food packaging bags should have five characteristics:
1,the materials have high barrier, can protect the frozen food from oxygen and Water volatilization.
2, good impact resistance and anti-puncture ability
3, resistant to low temperature, the packaging bags won't embrittle even if under -45℃
4,good oil resistance.
5,good safety, no toxic, harmful substances migration into the food.