Packaging fulfills four functions: containment, protection, convenience and communication. Most materials used for packaging foods belong to the following classes: metals, glass, paper and polymers. Some packaging media consist of a combination of two or more materials of these classes. Tinplate and aluminum are the main metals used for packaging. Metal can sizes are standardized. Detinning and corrosion of tinplate are causes for concern. Glass has the advantages of transparency, inertness, impermeability, rigidity and consumer appeal, and the disadvantages of fragility and weight. The advantages of paper are low cost, availability, low weight, printability and mechanical strength. Its most serious shortcoming is sensitivity to moisture. Due to their versatility and low cost, polymers are the most important packaging materials for foods. Their permeability to water and to oxygen is an important criterion for the selection of polymeric films as packaging materials.
Vacuum packaging, controlled and modified atmosphere packaging are widely applied techniques. Active packaging is defined as packaging that modifies the condition of the packed food so as to extend its shelf life and improve its safety. Intelligent packaging is a packaging system that monitors the conditions of the packaged food and provides information about changes in these conditions during storage.
Packaging fulfills four functions: containment, protection, convenience and communication. Most materials used for packaging foods belong to the following classes: metals, glass, paper and polymers. Some packaging media consist of a combination of two or more materials of these classes. Tinplate and aluminum are the main metals used for packaging. Metal can sizes are standardized. Detinning and corrosion of tinplate are causes for concern. Glass has the advantages of transparency, inertness, impermeability, rigidity and consumer appeal, and the disadvantages of fragility and weight. The advantages of paper are low cost, availability, low weight, printability and mechanical strength. Its most serious shortcoming is sensitivity to moisture. Due to their versatility and low cost, polymers are the most important packaging materials for foods. Their permeability to water and to oxygen is an important criterion for the selection of polymeric films as packaging materials.Vacuum packaging, controlled and modified atmosphere packaging are widely applied techniques. Active packaging is defined as packaging that modifies the condition of the packed food so as to extend its shelf life and improve its safety. Intelligent packaging is a packaging system that monitors the conditions of the packaged food and provides information about changes in these conditions during storage.
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