Analysis and Comparison of Various Canned Packaging Materials

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(1) Glass can: a container made of glass, with the advantages of being transparent and easy for consumers to observe and choose; Stable chemical properties, strong acid and sulfur resistance, and does not react with food to cause discoloration, flavor change, or spoilage. It is particularly suitable for packaging fruits, vegetables, and other acidic foods. The raw materials are abundant, cheap, and recyclable. The disadvantages are: bulky, easily broken, inconvenient transportation, and poor thermal conductivity.
(2) Iron box can: made of Tinning, it is a widely used container at present. Iron box cans are available in vertical, flat, ladder, and square shapes. Its advantages are: soft, easy to bend, stretch, and punch, lighter in weight than glass jars, less prone to breakage, easy to carry, transport, and store, good thermal conductivity, short sterilization time, and less prone to breakage when cold and hot changes rapidly. The disadvantages are: high cost, poor chemical stability, and easy interaction with the food in the can, causing corrosion of the iron sheet and deterioration of the food in the can.
(3) Plastic can: The can body is made of polypropylene plastic thin container, and the cover film is made of composite film hot melt sealing. Sterilization treatment after sealing. The can body is made of two materials: transparent and milky white, with various shapes and specifications. The cover film has a single layer of polypropylene, as well as two or three layers of composite film. This can has the advantages of high temperature resistance, no rust, light weight, low price, convenient opening, and good display. Shanghai Xilinmen Food Factory and Oil Second Factory have used it to fill bean paste and margarine, which is highly popular among consumers.
(4) Soft can: Made and processed from multi-layer composite film. The soft cans developed by Shanghai Food Industry Research Institute are generally divided into three layers: the outermost layer is polyester plastic film, which has a certain strength, puncture resistance, friction resistance, and is suitable for printing; The middle layer is aluminum foil, which has air insulation and light blocking properties; The innermost layer is a modified polyethylene plastic film, which is non-toxic and harmless, meets the requirements of food safety and hygiene regulations, and can be hot melt sealed. The advantages are lightweight, hygienic, practical, and easy to carry, which can greatly reduce the transportation volume of goods. Currently, it has been widely adopted abroad and has broad development prospects. Aluminum cans, stainless steel cans, etc. are currently rarely used and will not be introduced here.