retort packaging

Why Do Empty Tinplate Cans Fail After Retort Processing? Reference Standard: FDA 21 CFR 175.300 (Resinous and Polymeric Coatings for Food Contact) & ISO 13636:2012 (Metallic packaging – Double seam measurements) Short Answer Failures in empty tinplate cans during high-moisture retort applications are rarely due to simple rust. They are caused by thermal-mechanical strain asymmetry that forces sealing compounds out of position, and interfacial depassivation where salt ions penetrate microscopic lacquer cracks to trigger sub-film anodic undercutting. Thermal-Mechanical Strain Asymmetry: The Micromechanics of Seam Relaxation When evaluating the structural integrity of an empty tinplate can intended for heavy-duty food preservation (such as canned fish), engineers must confront the extreme thermodynamics … 続きを読む