EU Ban on Bisphenol a Forces Food Packaging Material Transition
The end of the main European Union transition period forces buyers to adopt alternatives to bisphenol A in food packaging.
Metal Can Lacquers
Protective Barrier
Organic polymer coatings function as thin chemical films applied to the interior and exterior surfaces of food and beverage containers to prevent corrosion and interaction between the packaged content and the metal substrate. These metal can lacquers act as a physical and chemical separator that maintains the integrity of the container during the shelf life of the product. The formulation of these layers must account for the specific acidity or mineral content of the foodstuff to ensure the underlying aluminum or steel avoids oxidation.
Polymers like epoxy or polyester serve as the foundation for these coatings. Industry standards mandate that all chemical constituents meet safety protocols for direct food contact to prevent leaching into the final product.
Application Process
Manufacturers use high speed coil coating lines or spray systems to deposit the coating material onto the metal sheets before or after the fabrication of the container. Pre-coated sheets undergo thermal curing in industrial ovens to crosslink the polymer chains and ensure durability during the mechanical deformation required to shape the body or ends of the can. Precise control of the oven temperature and conveyor speed prevents under-curing which leaves the metal vulnerable to chemical attack.
Automated inspection systems verify the uniformity of the layer to ensure that no microscopic gaps remain in the protective barrier.
Market Regulation
Global trade in processed food depends on the stability of container coatings which are subject to rigorous legislative scrutiny regarding chemical migration limits and environmental impact. Regulators periodically update permissible substance lists to address health concerns surrounding specific additives like bisphenol compounds. Regional environmental agencies track the emission of volatile organic compounds that arise during the curing stage of the coating application.
Continuous innovation in the development of non-epoxy resins drives the evolution of the supply chain for these materials. Consumer packaging performance relies on the mechanical resistance of the cured film during the double seaming process that seals the container.