Tin plated steel sheet color coating: This coating has a wide range of applications. It has good corrosion resistance to acidic foods, and its epoxy resin component makes it have good adhesion and flexibility. Its baking temperature is about 200～210℃/15min. It is mainly suitable for canned food such as soup, meat, fish, fruit and juice, and can also be used for the inner and outer surface coating of crown caps and various other caps. The content ratio of the two resins can be varied within a wide range. Although the adjusted formula can play a role in phosphate resistance, it will reduce the adhesion of the phenolic resin. For foods with high sulfur content, zinc oxide and aluminum powder fillers can be added to prevent the occurrence of vulcanization spots on the inner wall of the custom embossed tin plate can. Coatings with zinc oxide are not suitable for acidic foods and may cause discoloration of individual green vegetables.
Tin plated steel sheet with acrylic resin coating: usually added with titanium dioxide filler to make white, has good flexibility, good sulfur resistance, custom embossed tin plate with acrylic resin coating mainly used for vegetables, soups and foods containing substances that can generate vulcanization spots. The inner wall of the opened can has a ceramic-like and attractive appearance.
Custom embossed tin plate with phenolic resin coating: good coverage and excellent corrosion resistance to chemicals. It has the ability to block sulfide ions so that it cannot penetrate the coating. It is suitable for meat, fish, vegetables and soup. However, the adhesion to the surface of tinplate is poor, especially when the coating thickness is greater than 3 to 4 mm, the flexibility of the coating is poor. The baking temperature generally does not exceed 190°C, otherwise the coating penetrates into the substrate through the pores of the tin-plated layer and thermal degradation occurs. (Sulfur-containing compounds naturally exist in animal and plant foods. During the thermal processing of cans, these compounds will decompose to produce free sulfide and hydrosulfide ions, and will release hydrogen sulfide, which rubs against the inner wall of the tin plated steel sheet can. The damaged part (mechanical damage) forms sulfide spots. When the pH value of hydrogen sulfide is less than 6, iron sulfide in the head space of the tank will be produced and fall off to contaminate the contents of the custom embossed tin plate can.