Lulu used tinplate cans, and Chengde Lulu took great pains on the packaging cans of Lulu Almond Dew. If you hold a can of coke and Lulu in your right hand and left hand respectively, you will obviously find that the difference between them is huge. Because ordinary coke cans are aluminum cans, and Lulu uses tinplate cans, there are great differences in weight, texture and feel. So why did Lulu use tinplate cans instead of the more popular and lower-cost aluminum cans? The reason is that the airtight layer of packaging container is very important for the preservation of nutrients. The oxygen permeability of the container directly affects the preservation of vitamin C in the beverage. Glass bottles and cartons with low oxygen permeability are better for the preservation of vitamin C, among which tinplate cans are the best. So why not use aluminum cans instead of iron cans? That's because of the electrochemical action of metal, a small amount of iron will be dissolved from painted cans during storage, and it will exist in sealed products in the form of ferrous iron, which is easily absorbed by human body. Therefore, canned food and beverage can be regarded as a good source of iron, which has far-reaching significance for providing nutrition for canned food.