The importance and application value of canned paint

1. Protection of containers

The metal material of the can body of a three piece tin can is tin, and the metal materials of the top and bottom covers can be tin, chrome, or aluminum. Except for aluminum, which does not rust, both tin and chrome will rust when exposed to humid environments, especially when the tin and chrome layers are damaged during processing, storage, and transportation; Moreover, different foods contain different corrosion factors, and their ability to corrode aluminum, tinplate, and chrome plated iron is much stronger than that of water. The use of coatings can isolate metal materials from contact with the outside world, avoid scratches on metal substrates, and prevent corrosion factors in food from corroding substrates.

2. Decoration and brand promotion

Decoration and brand promotion are mainly aimed at the coating on the outside of cans. With the improvement of people's living standards, materials are becoming more and more abundant. There are many varieties of food inside cans, and there are also many products of the same type. While people pay attention to the food inside cans, they are also paying more attention to the appearance quality of cans. Paper labels or anti rust coatings on the outside of cans have gradually been replaced by exquisite design and printing, highlighting personalized needs and brand charm.

3. Food preservation

If there is no coating to prevent the corrosion factors in food from corroding the substrate, the metals in the substrate will gradually transform into tin ions, iron ions, or aluminum ions that enter the food, affecting the flavor of the food and seriously leading to non-compliance with relevant food hygiene standards.

4. Help paint iron processing and forming

With the development of modern processing technology and the increasing speed of canning and capping, coatings play a crucial role. It is the smoothness, hardness, and ductility provided by coatings that protect the substrate and enable the entire production line to flow quickly and smoothly.

5 Good Economic Benefits

Before the use of coatings, food packaging used high tin plated tinplate to prevent rust and protect food. Tin is a non renewable resource, very expensive, and the development of low-cost chrome plated iron has solved some food packaging problems. The development of coatings and the improvement of tinplate technology have made it possible to use low tin plated tinplate to package food, thereby reducing packaging costs.

6. Requirements for Coatings

(1) Good storage stability:

(2) The solvents in coatings pose little harm to human health;

(3) The inner coating used for canned food should comply with relevant national hygiene standards;

(4) Easy to construct, simple to operate, and forms a good coating after baking and curing;

(5) After the coating film is formed, it should have the required adhesion, hardness, impact resistance, chemical resistance, density, and welding resistance together with the substrate to meet the process requirements of canning and capping;

(6) After being sterilized and cooled, the coating on the canned food should have a good appearance and no peeling;

(7) The inner coating should not affect the flavor and color of the food;

(8) The inner coating, together with the substrate, should effectively prevent corrosion of the contents.