1. Opacity

In addition to triggering a deterioration reaction in food, light can also cause changes in proteins and amino acids. Vitamin C is more likely to be lost when exposed to light. The opacity of the tinplate box makes the preservation rate of vitamin C.

2. Good sealing

The barrier of packaging containers to air and other volatile gases is very important for the preservation of nutrients and sensory qualities. Comparing various juice packaging containers shows that the oxygen transmittance of the container directly affects the browning of fruit juice and the preservation of vitamin C. Metal cans, glass bottles and aluminum foil glue layers and cartons with low oxygen transmission rate have better preservation of vitamin C, and tinplate boxes.

3. The reducing effect of tin

The tin on the inner wall of tinplate will interact with the oxygen remaining in the container during filling, reducing the chance of oxidation of food ingredients. The reduction effect of tin has a good preservation effect on the flavor and color of light fruits and juices, so the juice cans packed in unpainted iron cans are better nutritious than the juice cans packed in other packaging materials, the brown change is slight, the acceptance of flavor quality is better, and the storage period is extended.