1.Opacity
In addition to the aggravation of food, light can also cause changes in proteins and amino acids. And vitamin C is more likely to interact with other food ingredients due to the irradiation of light, so that a large amount of vitamin C is lost, and the opacity of tinplate can improve the preservation rate of vitamin C.
2.Good sealing
The barrier properties of packaging containers to air and other volatile gases and the preservation of nutrients are very important. Compared with other packaging containers, food tanks have the lowest oxygen transmission rate and are conducive to sealed storage.
3.Reduction of tin
The tin on the inner wall of the tinplate food can interacts with the oxygen remaining in the container during filling, reducing the chance of food ingredients being oxidized. The reduction of tin has a good preservation effect on the flavor and color of light-colored fruits and juices. Therefore, the use of unpainted tinplate cans is more nutritious than the other cans, and the brown changes are slight. Acceptability of flavour quality and longer shelf life