Characteristics and advantages of tinplate cans

1 opaque

 In addition to causing food spoilage reactions, light can also cause changes in proteins and oxyacids. Vitamin C is more likely to interact with other food ingredients when exposed to light, resulting in a large amount of loss. According to research and analysis data, the loss of vitamin C in milk in transparent glass bottles is 12 times higher than that in dark bottles. Light will cause oxidative odor in milk, as well as the cracking of nuclides and methionine, which will lose nutritional value. The light-tightness of the can makes the preservation rate of vitamin C the highest.

2. Good sealing

 The barrier of the packaging container to air and other volatile gases is very important for the preservation of nutrients and sensory quality. Comparison of various fruit juice packaging containers proves that the oxygen permeability of the container directly affects the preservation of vitamin C of the juice; the oxygen permeability Low metal containers and glass bottles are good for vitamin C, and iron cans are the best. .

3. Reduction of tin

Tin on the inner wall of tinplate will interact with the oxygen remaining in the container during filling, reducing the chance of food ingredients being oxidized. The reduction effect of tin has a good preservation effect on the flavor and color of light-colored fruits and juices. Therefore, the juice of unpainted iron cans is better in nutrient preservation than the juice of other packaging materials, the brown color changes slightly, and the flavor quality Acceptability is good, the storage period is extended

4. Provide a source of effective iron

Tinplate canned foods, except for a few light-colored fruits and juice cans, mostly use internally painted empty cans to improve the tolerance characteristics of passengers: due to the electrochemical effect of metals, painted canned canned foods will have a small amount in storage The dissolved iron is present in the form of ferrous iron in the sealed canned food, which is easily absorbed by the human body and its content is about 1 to 10 ppm. As far as fruit and vegetable products are concerned, the raw material itself does not contain much iron. Iron can products are calculated in 350 ml beverage cans per can, with an iron content of 5 ppmi. Each can provides 1.75 mg of iron, which is about 18 mg of the daily intake of the body one tenth. If the above-mentioned fruit and vegetable juice beverages are rich in vitamin C, iron is more easily absorbed, so iron canned foods and beverages can be a good source of iron elements, and it has a more profound significance for the nutrition of iron cans.

  Because of these advantages, tinplate cans provide a closed system that completely isolates environmental factors in addition to heat.The color avoidance products are degraded by light, oxygen, and moisture, nor are they fainted due to the penetration of aromas, or penetrated by environmental odors. It is polluted and smells bad. The stability of food storage is better than other packaging materials. Vitamin C has the highest storage accuracy and the best preservation of oval nutrients.