Food vacuum packaging bags are used very frequently in our daily life. Many households use vacuum bags to package foods in order to extend the shelf life. The material of the vacuum bag directly affects its fresh-keeping performance. Next, let's take a look at the material and characteristics of the vacuum bag.

 

 

Commonly used food grade vacuum packaging materials are as follows:

 

First, polyester vacuum bag:

 

Polyester is a general term for polymers obtained by polycondensation of a polyhydric alcohol and a polybasic acid. Mainly refers to polyethylene terephthalate (PET), polyester (PET) vacuum bag. It is a colorless transparent, shiny vacuum bag, which is made of polyethylene terephthalate. A vacuum bag material made by extrusion into a slab and then biaxially stretched. Excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, good chemical resistance, oil resistance, air tightness and aroma retention. It is a commonly used barrier composite vacuum bag substrate. one. It is commonly used as the outer layer material for retort packaging, and has good printing performance.

 

Second, nylon vacuum bag:

 

Nylon (PA) vacuum bag is a very tough vacuum bag with good transparency, good gloss, high tensile strength, high tensile strength, good heat resistance, cold resistance, oil resistance and It is excellent in organic solvent resistance, abrasion resistance and puncture resistance, and is relatively soft and has excellent oxygen barrier properties. It is suitable for packaging hard articles such as greasy foods, meat products, fried foods, vacuum-packed foods, and retort foods.

 

A higher performance nylon composite bag and a multi-layer co-extruded vacuum bag can be derived on the basis of a nylon vacuum bag.

 

The main components of nylon composite bag are PET/PE, PVC/PE, NY/PVDC, PE/PVDC, PP/PVDC. The main difference between the composite bag and the process is the base material, laminating glue, barrier material and heat sealing material. , printing and protective layer coatings and other components.

 

The multi-layer co-extruded vacuum bag is mainly composed of nylon, which is composed of PA, EVOH and PE, PP, TIE and other resins, and adopts a symmetrical or asymmetric combination structure. Due to the addition of PA and EVOH, not only the barrier properties of the multilayer film to oxygen and flavor, the composite peel strength, the environmental resistance and the fresh-keeping storage period are greatly improved. It has the characteristics of no pollution, high barrier, strong function, low cost, small capacity ratio, high strength and flexible structure. It makes the production process of food packaging materials non-polluting. Third, PE vacuum bag:

 

Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. The transparency is lower than that of nylon, the hand feels stiff, the sound is crisp, and it has excellent gas barrier, oil resistance and fragrance retention properties. Not suitable for high temperature and refrigerated use, the price is cheaper than nylon. Generally used for ordinary vacuum bag materials without special requirements.

 

Fourth, aluminum foil vacuum bag:

 

Aluminum-plastic composite vacuum packaging bag (PET/AL/PE or PET/NY/AL/PE or PET/NY/AL/CPP), the main component is aluminum foil, opaque, silvery white, anti-gloss, good barrier , heat sealability, light blocking, high temperature resistance, low temperature resistance, oil resistance, aroma retention; non-toxic and tasteless; softness and other characteristics. It is suitable for moisture-proof, light-proof and vacuum packaging of large-scale precision machinery and equipment, chemical raw materials and pharmaceutical intermediates. It adopts four-layer structure and has good water-proof and oxygen-blocking functions. Aluminum foil vacuum bags are widely used in food, electronics, chemical and other industries. Because the raw materials of aluminum foil itself are relatively expensive, the cost of vacuum will be relatively high.

 

The above is the introduction of the common materials and characteristics of vacuum packaging bags summarized by Pingfei Packaging. I believe that after reading, many friends will have a general understanding when choosing their own product packaging bags.