Tinplate printing process is usually completed on the printing iron production line. Printed iron production lines generally consist of feeding devices, offset printing units, coating units, drying rooms, and take-up devices.
The process features and requirements of each process are as follows:
First, the inner coating
Packaging containers made of tinplate, depending on the characteristics of the contents, usually need to be coated with a coating on the inner surface of the container to prevent the contents from corroding the walls and the contents of the container, which facilitates long-term storage. For candy boxes, in order to prevent post-processing crimping, rust and iron exposed scratches, but also need to apply a layer of decorative paint, increase the appearance. For the performance of food cans not only have to have corrosion resistance, good adhesion, flexibility, non-toxic, odorless, in line with food hygiene and safety requirements, but also have to be equipped with post-processing such as high frequency resistance welding heating, internal coating The local high-temperature heating, and cooking at 121 °C after the canned without fade and no loss of light performance. Generally coated with phenolic resin coatings, epoxy-phenolic resin coatings, acrylic resin coatings and aluminum powder coatings, etc., usually based on the content of the characteristics of the choice of internal coating types and coating thickness.