1.PA (Nylon) has good barrier performance, transparency, puncture resistance and other mechanical properties; easy to absorb moisture and deform, and the barrier performance of PA after moisture absorption is also greatly reduced.
Application
It is widely used in food packaging, mostly for the barrier layer of three-layer or multi-layer composite materials; Commonly used in composite material inner layer (middle layer of ham packaging)
2.EVOH (Ethylene/Vinyl Alcohol Copolymer) has high gas barrier property, fragrance retention, moisture absorption and gas barrier effect after moisture is attached, oil resistance, good thermal stability; high mechanical strength, elasticity, surface hardness, wear resistance High gloss, low haze, high transparency, UV-resistant
Application
EVOH is made of composite film intermediate barrier layer, used in all rigid and flexible packaging; used in aseptic packaging, hot pot and retort in the food industry Bags, packaging dairy products, meat, canned juices and condiments, export seafood is vacuum-packed with PE/EVOH/PA/RVOH/PE five-layer co-extrusion film.
3.PVDC (polyvinylidene chloride) is an ideal packaging material with high barrier properties, strong toughness, low-temperature heat sealing, good heat shrinkage and chemical stability. Acid and alkali resistance, oil immersion resistance and resistance to various chemical solvents
Application
PVDC is widely used in the packaging of food, medicine and military products. Its processing technology is high and difficult, and PVDC single-layer film is now extruded for casing film or multi-layer co-extruded film.
PVDC latex coating is mainly used for hard sheet composite film and pharmaceutical blister packaging (blisters laminated with PVDC and aluminum foil)
4.BOPET (polyester) has high tensile strength, high light transmittance, good appearance, good printability, good barrier properties.
Application
Mostly used for printing layer or barrier layer. Intermediate glue pretreatment polyester film, which can be more widely used in food and detergent packaging that require special requirements such as moisture resistance, damage resistance, and oxidation resistance, or in electronic materials, audio-visual substrates, etc.
The BOPET film produced by the casting process has high mechanical strength, good stiffness, and certain barrier properties. It is a medium barrier material and has good printability.)
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