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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.

Tin plate sheet is based on low carbon steel, and then coated with a thin layer of tin (usually 0.08 mm), which not only has an anti-corrosion effect, but also gives the tin plate sheet good gloss and workability.

Tin plate sheet is not essentially a single metal, but a composite material composed of steel and tin. Its main component is low-carbon thin steel plate with a thin layer of tin on the surface. Main uses of tin plate sheet: 1. Food packaging 2. Beverage packaging 3. Cosmetic packaging 4. Chemical containers 5. Industrial parts and tools 6. Stationery and daily necessities

During World War II, there was a shortage of tinplate sheet, which prompted people to look for alternative materials to meet packaging needs. During this period, aluminum became the main alternative material for the manufacture of seamless can-shaped packaging containers.

Tinplate is a tin-plated steel. It is made of cold-rolled low-carbon steel plates or steel strips through a precise process. Five common applications of tinplate: 1. Food packaging industry 2. Chemical product packaging 3. Daily necessities and cosmetics packaging 4. Toys and crafts 5. Electronic product housing

The production process of tinplate sheet includes raw material preparation, cold rolling, pickling, annealing, electroplating tinning and post-processing. These links cooperate with each other to ensure the quality and performance of the final product.

Process of tinplate sheet tinning: 1. Pretreatment of steel sheet ● Degreasing treatment ● Pickling ● Surface activation 2. Process of electroplating tin ● Setting of electrolytic cell ● Applying current ● Control of coating thickness 3. Post-treatment process ● Passivation treatment ● Oiling

The production of cookie jars involves multiple links, including raw material selection, molding processing, surface treatment and assembly and other complex steps. Among them, tinplate sheets have become the preferred material for making cookie jars due to their good corrosion resistance, plasticity and excellent printing performance.

Mechanical grinding is one of the most common rust removal methods, which mainly removes rust on the surface of tinplate sheet by physical means. Commonly used tools include sandpaper, wire brushes, polishers, etc.