Tinplate cans typically have a smooth surface with a metallic sheen. This is because the tin coating itself creates a silvery-white reflective effect, while the coating and printing also contribute to the can's glossy appearance.
Tinplate cans offer excellent sealing properties. Sealed with a roll-to-seal method, they prevent air from easily entering. Their seal not only blocks air but also effectively prevents moisture from entering, making them particularly suitable for coffee products that require dry storage.
The recycling process for tinplate cans is relatively simple, and the recycling rate is very high. Recycled tinplate cans are first cleaned and treated to remove impurities. The metal is then melted to extract the iron and tin. These extracted metals can be reused in the manufacture of new metal products.
The main component of tin plate cans is steel, and the surface plating is pure tin. Tin is the preferred material for plating because of its corrosion resistance. Compared with steel, tin can effectively resist the erosion of moisture, oxygen, and acidic substances, prevent the can body from rusting, and thus protect the safety of the contents.
If the tin layer of the tin plate sheet is damaged or scratched, the exposed iron part will lose the protection of the tin layer and be directly exposed to the air. These exposed iron will quickly oxidize when encountering moisture and oxygen in the air to form rust.
As a strong and stable metal material, tin plate sheet can effectively prevent the influence of oxygen, moisture, ultraviolet rays and other factors in the air on cosmetics. Through good sealing and impermeability, tin plate sheet packaging can minimize the contact of cosmetics with the external environment, thereby extending its shelf life.
1. Why is the top of tin plate cans called "can lid"?
The top of tin plate cans is usually called "can lid" or "lid", which is used to close the can body and isolate the internal contents from the outside world. Depending on the purpose, the tin plate cans lid will adopt different designs.
The anti-corrosion performance of electrolytic tinplate mainly comes from the tin layer. Tin is a metal that has strong antioxidant properties and is not easy to react with oxygen in the air, so it can effectively prevent the oxidation process on the iron surface.
Due to the moisture-proof, light-proof and anti-oxidation properties of tinplate food packaging cans, it can provide a relatively stable and closed environment for tea, thereby delaying the loss of tea flavor. Therefore, the use of tinplate food packaging cans can significantly extend the shelf life of tea.
Generally speaking, tinplate cans have a long shelf life, usually more than two years or even longer, but the specific period still depends on the use environment of the can. If tin plate cans are placed in a humid, highly acidic or alkaline environment, the tin coating may be affected, thus shortening the overall shelf life of the can.
