food packaging

Why Do Tuna Cans Fail After Retort? The Physics of Metal Packaging Reference Standard: ASTM A623 / ISO 9001:2015 (Standard Specification for Tin Mill Products) Short Answer Empty tuna cans with lids frequently succumb to internal “blackening” and geometric buckling during the 121°C retort process due to sulfur-staining kinetics where protein breakdown releases reactive ions that attack the tinplate lattice. Furthermore, improper management of the volumetric pressure inversion during the cooling phase causes transient negative pressure that exceeds the cylindrical shell’s critical buckling load, leading to permanent indentation and breached hermetic seals via micro-capillary fluid dynamics. Sulfur-Staining Kinetics: The Electrochemical Interaction of Protein Breakdown When engineering food-grade metal packaging, the … 続きを読む