Many people don’t know what material food packaging bags are generally made of. Honest will briefly explain the materials of food packaging bags.
Food packaging material: PVDC (polyvinylidene chloride), PE (polyethylene), PP (polypropylene), PA (nylon), EVOH (ethylene/vinyl alcohol copolymer), aluminized film (aluminum + PE), etc. , several major membranes.
The production of film can be divided into: stretch film, blown film.
At present, the main materials used for food packaging are PP and PE, that is, polypropylene and polyethylene plastics. For both materials, food packaging can be satisfied.
Compared with non-food packaging, PP and PE do not contain plastic additives. We all know that plastic additives have a huge impact on the human body, especially children’s health. PP and PE will not release toxic materials during use. Some Other materials can cause cancer, but PP and PE do not. PVC packaging used to be used for cling film, but because of its insecurity, it is gradually replaced by PE cling film.
The characteristics of PE are: soft, mechanical properties are poorer than PP, representative products include supermarket shopping bags, plastic wrap, garbage bags, etc. PP is hard, anisotropic (it is easy to tear if there is a gap), good mechanical properties, and high temperature performance is better than PE, which means that the product has bread bags.
Generally according to the material structure, the inner layer is PE or CPP, the outer layer is PA, PET, the middle may be EVOH or PVDC, etc., and some are aluminized film or aluminum foil.
PE and CPP have good heat sealing properties, that is, they are easy to seal.
PA and PET have good printability and can be used in the outer layer to print beautiful pictures.
PVDC and EVOH have good barrier properties and prevent oxidation.
Aluminized film and aluminum foil have good light-shielding properties and are suitable for products that are not suitable for light.
Various materials have different properties and different uses. General food packaging bags are not a single material, but are multi-layer composites, which can be composited with two layers, three layers, four layers, etc.
Dry food and frozen food are generally made of PET/PE.
For example, high-temperature cooking is generally made of nylon composite CPP, or other composites.
The red casing of the ham is a single material PVDC.
Candy and chocolate generally use transparent paper/PP, kraft paper/PE/AL/PE, AL/PE, etc.
Post time: Sep-06-2022