Puffed food occupies a non-negligible position in the food market and is one of the flexible packages often produced by plastic flexible packaging plants . So what are the packaging forms and materials of puffed food packaging bags?
There are three main types of puffed food packaging bags: The first is ordinary plastic flexible packaging, which is not filled with any gas or evacuated in bulk. According to the different barrier materials added in the packaging material, it can meet different shelf life requirements; The second is air-filled plastic flexible packaging, which is filled with air in the finished product packaging to prevent the puffed food from being crushed. Generally choose a material with better toughness to prevent the packaging bag from breaking; the third is the flexible packaging of nitrogen-filled plastics, which uses nitrogen to prevent the oxidative deterioration of the fried puffed food. The corresponding packaging materials have high barriers to nitrogen and oxygen. Aluminium composite film.
There are three main materials for common puffed food packaging bags: The first is KOPP / VMOPP / LDPE , which is used for potato chip packaging. It has the advantages of good heat sealability, oxygen barrier and shading, and the shelf life can reach more than one year. If it is used again The nitrogen filling method can also achieve a longer shelf life; the second is BOPP / VMPET / CPP (or PE ), BOPP / PE / VMPET / CPP co-extruded film, OPP / PET / AL / CPP , which is used for puffed food Packaging, the form of modified atmosphere packaging, has the advantages of sealing, shading, oil resistance, etc .; the third is BOPP / VMCPP , PET / VMCPP , commonly used in the packaging of puffed food such as potato chips, relative to the above two materials The cost is lower, but the shelf life of the contents is slightly shorter. The material has the advantages of oxygen barrier, moisture barrier, light protection, oil resistance, fragrance retention, very scratchy appearance, bright colors, low cost, etc. Among them, BOPP , PET and VMCPP have good stiffness, BOPP has good printability and high gloss . CPP also has good oil resistance. VMCPP has good barrier properties and keeps fragrance and dampness.
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