Food Safety

Why Do Tinplate Lids Leak After High-Heat Retort Processing? Reference Standard: ISO 9001:2015, ASTM F1140 (Standard Test Methods for Internal Leak Resistance and Failure of Flexible Packages) Short Answer Tinplate lid leakage post-retort is primarily driven by “thermal-mechanical strain asymmetry,” where the differential cooling rates between the steel substrate and the sealing compound compromise the double seam integrity. This physical divergence creates micro-capillary paths, which, when coupled with electrochemical pitting from high-moisture contents, leads to hermetic seal failure and localized oxidation. Intergranular Diffusion Kinetics: Chloride Penetration Paths in Lacquer Micropores The failure of tinplate lids in high-moisture and saline environments is rarely a sudden event but rather a microscopic progression … 続きを読む