Material of the candy tin box

　　 Candy tin box The material

　　Candy tins are primarily made of tinplate—also known as tinned iron—because this material is resistant to rust and has a wide range of applications. Tinned packaging containers are highly favored by Chinese corporate customers due to their strong antioxidant properties, diverse designs, and exquisite printing quality. They are widely used in fields such as food safety packaging, pharmaceutical packaging, daily-use product packaging, instrument packaging, and the development of industrial product packaging. Consequently, countries around the world are actively promoting the development of this type of packaging container and placing great importance on cultivating expertise in its production. Tinplate-based metal packaging is one of the most widely used types of metal packaging materials globally.

　　 Candy tin box Tinplate packaging, with its excellent sealing properties, corrosion resistance, lightfastness, robustness, and unique metallic aesthetic appeal, enjoys widespread use in the packaging container industry and is a universally adopted packaging material worldwide. The primary material used for candy tin boxes is tinplate—a type of steel coated with a layer of tin on its surface. Because it resists rusting, tinplate is also known as "tinplate." In China, this coated steel sheet can be referred to as "tinplate." You might not be entirely sure about the term "tinplate," but at the 1973 Chinese Tinplate Conference, it was already officially designated as "tinplate," and the term "tinplate" has since ceased to be used in official documents. Since tinplate is printed with varnish before being formed into boxes, some boxes or cans may appear particularly shiny. These are tinplate boxes.

　　1. The opacity of tinplate candy tins. Besides causing food spoilage, light can also induce changes in proteins and amino acids. Moreover, vitamin C is particularly susceptible to degradation when exposed to light, leading to significant losses as it readily reacts with other food components. According to research and analysis, vitamin C loss in milk stored in transparent glass bottles is 14 times greater than in milk stored in dark-colored glass bottles. Additionally, exposure to light can give rise to oxidative off-flavors in milk and result in the degradation of nutritional value—such as loss of nutrients like nucleotides and methionine. Therefore, the opaque nature of tinplate packaging helps preserve vitamin C at a much higher rate. In most countries, during the distribution and circulation of food products, packaging designs must be able to withstand exposure to light. This is because different levels of illumination not only trigger deterioration reactions in Chinese food products but can also affect the quality and grade of food safety in China. The opacity of tinplate containers further enhances food preservation, maintaining both the texture and aroma of the food.

　　2. Candy tin box Tinplate boasts excellent sealing performance. The barrier properties of packaging containers against air and other volatile gases are crucial for preserving nutrients and maintaining sensory quality. Comparative studies and analyses, along with various approaches to designing packaging containers for different juice products, clearly demonstrate that the oxygen permeability of a container directly influences—through societal impacts—the browning of juices in China as well as the preservation of vitamin C. Metal cans, glass bottles, aluminum foil-laminated materials, and cartons with low oxygen permeability provide better conditions for preserving vitamin C; among these, tinplate cans perform particularly well. For food enterprises engaged in research on nutritional value and for preserving the sensory qualities of products, the barrier properties of candy tins against external air are of great significance. The breathable characteristics of tinplate boxes can better protect traditional Chinese foods from external contamination and social impacts.