With the development of economy and the improvement of people's living standards, food packaging has gradually become a part of commodities from the subsidiary status of commodities, which is of great significance to protect commodities, facilitate storage and transportation, promote sales and improve the value of commodities.
At present, there are more than 30 kinds of plastics for food packaging, and about 20 kinds of plastics for food soft packaging, such as PE, PP, PS, PET, PA, PVDC, EVA, NY, PY4, EVOH, PVC, PT, ionic bond resin, etc. Among them, there are PVA, EVOH, PVDC, PET, PA, etc. with high oxygen resistance; PVDC, PP, PE with high humidity resistance; PET, PA with high temperature sterilization resistance; ion bond resin, PA, PET with good mechanical properties; PET, PA with high temperature resistance and low temperature resistance. The commonly used food packaging plastics are PE, PP, PET, NY, PT and so on.
Composite material is a kind of soft packaging material with the most kinds and the most widely used. At present, there are hundreds of multi-layer composites containing plastics used in food packaging. Composite materials generally use 2-5 layers, but special needs can reach 7 or more layers. Using plastic, paper, aluminum foil and other substrates scientifically and reasonably in combination or lamination can almost meet the packaging requirements of different foods.
Composition, Characteristic and Usage of Some Common Composite Packaging Films
Composite Packaging Material (Composition)
Drinks, condiments, ice cream
Candy, Powdery Food
Biscuits, instant noodles, candies, frozen foods
Moisture-proof,gas-blocking,High strength, transparent
Milk powder, cosmetics
High strength,heat-sealable,transparent,Acupuncture resistance
Frozen food containing bone spurs
Metal luster,Ultraviolet radiation resistance
Easy Sealing,High Temperature Resistance Steaming
High Temperature Bags
PET/Adhesive layer/PVDC/Adhesive layer/PP
Moisture-proof,Ultraviolet radiation resistance
Tea, medicine, milk powder