1. Pure tin sheet has good sealing,the barrier properties of packaging containers to air and other volatile gases are very important for the preservation of nutritional content and sensory quality. Comparison of various juice packaging containers proves that the oxygen permeability of the container directly affects the browning of the juice and the preservation of vitamin C; the preservation of vitamin C in metal printing cans, glass bottles, aluminum foil laminates, and cartons with low oxygen permeability Better, of which metal printing cans are the best.
2.Metal printing tin cans have reduction of tin,the tinned inner wall of pure tin sheet 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 iron cans has better nutritional preservation than other packaging cans, and the brown changes are slight. Acceptability of flavor quality is good, so the shelf life is extended.
3. Metal plate printing has good tensile properties. The metal printing tin box made of pure tin sheet also has the characteristics of high stamping performance, no aging, and low yield point, so it has strong stamping characteristics, which can ensure higher precision when cutting the surface of the board