Tinplate (SPTE), also known as tinplate, is a tin-plated iron sheet on both sides, which is a cold-rolled low-carbon steel sheet that is rust-proof, corrosion-resistant and non-toxic. Mainly used in the production of metal packaging, including canned food, beverages, chemicals, medicine, hygiene, paints, paints, sprays, cosmetic caps, etc. Taiwan’s influence on Japan is known as the iron and gold sheet metal, which is often associated with tinplate. The white iron in Taiwanese is often referred to as stainless steel tinplate suppliers.
As early as the 14th century, Bohemia began producing tinplate, mainly used to make cutlery and drinking glasses. In 1800, the British made tinplate cans that preserved food for a long time. In 1847, Americans invented canning machines. Since then, the demand for tinplate has continued to expand. Currently, about one-third of the tin produced in the world is used to make tinplate.
In addition to causing adverse reactions in food, light can also cause changes in proteins and amino acids. However, when vitamin C is exposed to light, it is more likely to cause it to interact with other food ingredients, resulting in a large loss. According to research and analysis, the loss of vitamin C in milk in clear glass bottles is 14 times higher than that in dark bottled milk. It also causes oxidation and odor of milk, as well as cracking of nuclide and methionine to lose nutritional value. The opacity of the tin can makes the preservation rate of vitamin C the highest.
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. It is better, and it is best to use iron cans.black carbon steel pipe
Reduction of tin
The tin on the inner wall of the tinplate 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.