Vacuum pouches are used to hold food or other products, vacuum and sealed by vacuum packaging machines, to extend the shelf life of food products, isolate vapour and air to protect chips and bearings, etc. Vacuum pouches are widely used in the food industry, and their quality and material directly affect the shelf life of food. Next, let’s take a look at the common materials and characteristics of vacuum pouches.
It’s important to understand that for different products and different storage environment, you should use vacuum pouches made of different materials. For example, frozen fish and seafood products can use PET/PA/LLDPE material vacuum pouches because of it’s excellent features of low-temperature resistance and penetration resistance.
Polyester vacuum pouches
Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids. Mainly refers to polyethylene terephthalate (PET). PET vacuum pouch is colorless, transparent and glossy. Polyethylene terephthalate raw material produce thick sheet by extrusion and then biaxially stretched. PET material have 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 fragrance retention, it is one of the most commonly used barrier composite vacuum bag base material. PET is often used as the outer material of retort pouches, with dependable printing performance.
Nylon vacuum pouches
Nylon (PA) vacuum pouch 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 excellent resistance to organic solvents, abrasion resistance, puncture resistance, relatively soft, excellent oxygen resistance, suitable for packaging hard items, such as greasy food, meat products, fried food, vacuum packaged food, steamed food, etc.
Based on PA vacuum pouches, nylon composite pouches are invented with better performance. The main components of nylon composite bags are PET/PE, PVC/PE, NY/PVDC, PE/PVDC, PP/PVDC. , printing and protective layer coatings and other components.
The main component of the multi-layer co-extruded vacuum pouch is nylon, which is composed of PA, EVOH and PE, PP, TIE and other resins, and adopts a symmetrical or asymmetrical combined structure. Due to the addition of PA and EVOH, not only the barrier properties of the multi-layer film to oxygen and fragrance, 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, flexible structure, etc. It makes the production process of food packaging materials pollution-free.
PE vacuum pouches
Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. The transparency is lower than that of nylon, the handle is stiff, the sound is crisper, and it has excellent air-barrier, oil-barrier and fragrance-preserving properties. It is not suitable for high temperature and cold storage, and the price is cheaper than nylon. It is generally used for ordinary vacuum bags without special requirements.
Aluminum foil vacuum pouches
Aluminum-plastic composite vacuum pouches (PET/AL/PE or PET/NY/AL/PE or PET/NY/AL/CPP), the main component is aluminum foil, opaque, silvery white, anti-gloss, with good barrier properties , heat sealability, opacity, 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 precision mechanical 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 materials of aluminum foil itself are relatively expensive, the cost of aluminum foil vacuum bags will be relatively high.
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