Easy to pull food cans are usually coated with organic protective coatings on the inside and outside of the can walls. The coatings used must be harmless to the human body and not cause any odor to the food, meeting the standards of national hygiene regulations. The inner wall coating of food and beverage metal cans is mostly ethylene resin coating, which is used to prevent corrosion of the can wall by food, avoid the dissolution of metal ions, protect the quality of the contents during storage, and maintain good original flavor performance. And the outer wall coating prevents rusting outside the can, protects the printing film, increases aesthetics, and enhances product value. The outer wall coating must have good gloss, hardness, adhesion, color retention, and cooking resistance. And it is required that the outer wall coating can withstand processing deformations such as friction, impact, shear, bending, and twisting during the canning process, and that the coating remains unchanged during the canning sterilization process.

Anyway, the inner and outer wall coatings of food cans must have good food resistance, corrosion resistance, and low penetration of metal ions; Good coating construction and drying properties; Mechanical processing resistance, heat and sterilization resistance, and compliance with toxicology and hygiene regulations.