Introduction to Common Materials of Vacuum Packaging Bags
Vacuum packaging bags are used frequently in our daily life. Many families use vacuum packaging bags to package food to achieve the purpose of extending the shelf life. The material of the vacuum bag directly affects its preservation 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:
Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids. polyester (PET) is a colorless, transparent and glossy vacuum bag. It is made of polyethylene terephthalate. It is a vacuum bag material made of thick sheets by extrusion and then biaxially stretched. Excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and good fragrance retention, is a commonly used barrier composite vacuum bag substrate one. Commonly used as outer layer material for retort packaging, with better printing performance.
Nylon (PA) vacuum bag is a very tough vacuum bag with good transparency, good glossy, high tensile strength, tensile strength, and good heat resistance, cold resistance, oil resistance and It has excellent organic solvent resistance, abrasion resistance and puncture resistance, and is relatively soft and has excellent oxygen barrier properties. On the basis of nylon vacuum bags, higher performance nylon composite bags and multi-layer co-extrusion vacuum bags can be derived.
Polyethylene (PE) is a thermoplastic resin obtained by polymerization of ethylene. The transparency is lower than that of nylon, the hand feel is stiff, the sound is brittle, and it has excellent gas resistance, oil resistance and fragrance retention. Not suitable for high temperature and refrigeration use, the price is cheaper than nylon. Generally used for ordinary vacuum bag materials without special requirements.
Aluminum laminated vacuum packaging bag (PET/AL/PE or PET/NY/AL/PE or PET/NY/AL/CPP), the main component is aluminum foil, opaque, silver-white, reflective, with good barrier properties , Heat sealing, shading light, high temperature resistance, low temperature resistance, oil resistance, fragrance 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. The four-layer structure is mostly used, which has good water and oxygen barrier functions. Aluminum foil vacuum bags are widely used in food, electronics, chemical and other industries. Since the raw material of aluminum foil itself is 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 YONGLIANTAI PLASTIC Packing. I believe that you will have a general understanding when choosing their own product packaging bags after reading it.
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