The tin on the inner wall of the tin box will react with the oxygen remaining in the container during filling, greatly reducing the chance of food ingredients being oxidized The reducing effect of tin has a good preservation effect on the flavor and color of light colored fruits and juices. Therefore, juice cans packaged in unpainted iron cans have better nutritional preservation than juice cans packaged in other materials, with slight brown changes and better preservation of flavor quality. As a result, the storage period is extended