Tin coated steel sheet packaging has a wide range of coverage in the packaging container industry because of its good sealing, anti-corrosion, light protection, sturdiness and unique metal decoration charm, and is an international packaging variety. The main material of iron box packaging is steel tin plated, which is coated with a layer of tin, which is not easy to rust, also called tin plating.
1. The light-proof property of tin coated steel sheet
In addition to worsening food responses, light also causes changes in proteins and amino acids. However, vitamin C is more likely to interact with other food components and be lost in large amounts when exposed to sunlight. According to research and analysis, the loss of vitamin C in the milk of the transparent glass bottle is 14 times higher than that of the milk in the dark bottle. Because the steel tin plated box is opaque, the preservation rate of vitamin C is the highest. In the process of circulation of most food, the packaging environment must be under light conditions, because light will not only cause the deterioration of the food, but also cause changes in the quality and grade of the food. The light impermeability of the steel tin plated box makes the food preservation rate higher , can preserve the taste and aroma of food.
2. Steel tin plated has good sealing performance
The barrier of steel tin plated packaging containers to air and other volatile gases is important to preserve nutritional and organoleptic quality. The results show that the oxygen permeability of the container directly affects the browning of the juice and the preservation of vitamin C. The tin coated steel sheet cans, glass bottles, aluminum foil laminates and cartons with low oxygen permeability have better preservation effects on vitamin C, and the iron can has the best preservation effect. good. The barrier of the tin sheet box to the outside air is very important for the internal nutritional and sensory preservation of the food. The gas transmission rate in the steel tin plated box can better protect the food from external contamination and influence, making the food safe and healthy