Material
Electrolytic Tin Plate (ETP)
Electrolytic Tin Plate (ETP) is a thin sheet of steel that has been coated with a thin layer of tin through an electrolytic process. This process involves immersing the steel sheet in a bath of electrolyte solution, along with a tin anode and a cathode, and passing an electric current through the bath. This causes tin ions from the anode to be deposited onto the surface of the steel sheet, forming a thin layer of tin coating.
Material ETP Process
The Material ETP process is used to manufacture food grade tin boxes, which are widely used for packaging food products due to their durability, safety, and recyclability. The process involves several steps to ensure that the tin boxes meet the necessary standards for food contact and hygiene.
Selection of Stainless Steel Plate: The process begins with the selection of high-quality stainless steel plates. These plates serve as the base material for the tin coating and are chosen for their resistance to corrosion and ability to maintain the integrity of the food products.
Hot Degreasing: The stainless steel plates undergo a hot degreasing process to remove any oil, grease, or other contaminants from the surface. This step is crucial to ensure proper adhesion of the tin coating and to prevent any contamination of the food products.
Water Rinse: After degreasing, the plates are thoroughly rinsed with water to remove any residual degreasing agents and contaminants.
Pickling: The plates are then subjected to a pickling process, which involves treating them with an acidic solution. This process removes any scale, rust, or other impurities from the surface of the plates, creating a clean surface for the tin coating.
Water Rinse: Following pickling, the plates are rinsed again with water to remove any remaining pickling solution and debris.
Activation: The activated surface of the plates is now ready for the tin coating. Activation helps improve the adhesion of the tin to the steel surface.
Nickel Strike Plating: A thin layer of nickel is plated onto the activated surface of the plates. This nickel layer enhances the corrosion resistance of the tin coating and improves its bonding to the steel surface.
Water Rinse: The plates are once again rinsed with water to remove any residual nickel plating solution.
Glossy Copper Plating: A layer of glossy copper is then plated onto the nickel-plated surface of the plates. This copper layer provides a smooth and shiny base for the final tin coating.
Water Rinse: Another water rinse is carried out to remove any excess copper plating solution.
Product Drying: The plated plates are dried to remove any remaining moisture before further processing.
Finish: The dried plates are now ready for further processing, such as cutting and shaping, to create the final food grade tin boxes.
The Material ETP process ensures that the food grade tin boxes produced are of high quality, with a clean and durable tin coating that meets the necessary standards for food contact. These tin boxes are not only functional and safe for packaging food products but also environmentally friendly due to their recyclability.