Canned packaging can be roughly divided into two types: glassware and tin cans. Generally, the shelf life of glass cans is about 8 months. It is easy to absorb light and heat. After a long time, the food in the cans will be black. The tin can have a shelf life of up to 2 In addition, there are other obvious features and advantages: the advantages of tin cans:
In addition to causing adverse reactions in food, light can also cause changes in proteins and amino acids. Vitamin C is more likely to be lost by exposure to light. The opacity of the tin can makes the vitamin C have the highest preservation rate.
2, good sealing
The barrier properties of packaging containers to air and other volatile gases are important for the preservation of nutrients and sensory qualities. Comparing various juice packaging containers, the oxygen transmission rate of the container directly affects the browning of the juice and the preservation of vitamin C; the metal cans with low oxygen transmission rate, the glass bottles and the aluminum foil, and the preservation of the vitamin C in the carton. Better, among them, the best tin cans.
3, the reduction of tin
The tin on the inner wall of the tin acts on the oxygen remaining in the container during filling, reducing the chance of oxidation of the food ingredients. The reduction of tin has a good preservation effect on the flavor and color of light-colored fruits and juices. Therefore, the juice cans using unpainted iron cans are better preserved than the juice cans of other packaging materials, and the brown change is slight. The flavor quality is better accepted and the shelf life is extended.
Packaging advantages oftin cans:
1. Good mechanical performance:
tin cans are much stronger than other packagings, and have good rigidity and are not easily broken. Not only for small sales packaging, but also for large shipping packages.
2, excellent sealing:
The tin can have excellent sealing performance compared with any other materials, such as gas barrier, moisture proof, shading, taste preservation, and reliable sealing, which can protect the product to the utmost extent.
3. Mature technology:
The production process of tin can be very early, the process is quite mature, and the supporting production equipment and tools are also matured, so that the production efficiency can be increased to a greater extent, and the packaging requirements of various products can be met.
4, the shape is different:
tin can be made into various shapes according to different needs, such as square cans, oval cans, round cans, horseshoes, trapezoids, octagons, etc., which not only meets the packaging needs of different products, but also makes the can packaging more changeable.
5, can be recycled and reused
In line with international environmental requirements and future product trends. At present, metal container tanks are the most convenient for recycling among many packaging materials, and the recycling rate is also the highest.