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How much do you know about tinplate cans?

How much do you know about tinplate cans?

How much do you know about tinplate cans?

(1) Classification by material

Can be divided into two major categories of steel and aluminum. The steel series mainly includes low-carbon thin steel plate, tin-plated thin steel plate, chrome-plated thin steel plate, aluminized thin steel plate, galvanized thin steel plate, etc .; the aluminum series mainly includes aluminum alloy thin plate and aluminum foil.

(2) Classification by material thickness

For plates and foils. The sheet is mainly used for manufacturing packaging containers, and the foil is mainly a component of the composite material.

 

The development history of metal packaging materials

The application of metal packaging materials began in 1200 AD. At that time, Bohemia, Czechoslovakia produced tinplate, but its production technology was not spread until 1620, when the Grand Duke of Southern Germany obtained the technology. Metal packaging has only begun to be widely used. In the latter part of the 17th century, people began to use tinplate to make metal buckets to hold dry food. In the 18th century, people began to use food cans to store food. In 1809, a chef and confectioner Nicholas Appert in Paris invented a can storage method, that is, to put food in a wide-mouth bottle, cover it with a cork stopper, give enough temperature to heat sterilize and remove the air, then seal Method can save food for a long time without corruption. In 1810, the British Peter Durand invented the technology of storing food in tin cans using the above principle, and tin cans were born. Before the Second World War, with the improvement of rolling technology and the invention of metal can making machines, the output of tinplate increased greatly. After the Second World War, due to the shortage of tin resources, in order to save tin, people developed tin-making materials or tin-free tin-making materials. As a result, poor-thickness tinplate, low-tinplate, and tin free thin steel plate came out one after another. In the 20th century, with the improvement of aluminum metallurgy technology, the improvement of rolling technology and the appearance of aluminum foil, aluminum began to be widely used in the packaging industry.

In recent years, the can-making technology has developed rapidly. It started as a three-piece can consisting of three parts: the can body, the can bottom, and the can lid.Later, the can body and the can bottom joined together and the can lid was composed of two parts. Tablet cans. The traditional three-piece tin soldering can uses tin-lead solder to weld the seam of the can body, which consumes much tin, and the lead content in the solder can contaminate the built-in food. With the appearance of tin free thin steel plate, people have successfully developed seam welding process. The process of seam welding cans is based on contact resistance, electric heating and melting, and then applying pressure to weld the can body. Later, there emerged a bonding can, which uses organic adhesives to bond the can body seam making process. Both of these methods eliminate the pollution of lead to the food in the can, and solve the problem that the tin-free steel plate cannot be tin-welded. They are widely used in the packaging of beer and carbonated beverages. The modern and advanced three-piece can manufacturing methods mostly use the seam welding method and the bonding method. It has broad development prospects, and tin solder cans have been eliminated in advanced countries such as Europe, America, and Japan. With the widespread use of aluminum in packaging, two-piece cans have appeared. Its structural integrity is strong, easy to decorate and print, and soon occupied the beverage packaging market. However, the production of aluminum consumes a lot of electric energy and its high price limits its usage. However, with the continuous improvement of the can-making process, two-piece cans have been successfully produced using tin-plated thin steel plates and tin free thin steel plates, and automated production lines have been used in industrial production to greatly improve the efficiency of can-making( It can reach 400 cans / min; the production speed of two-piece cans can reach 800-1200 cans / min), so the application prospect of metal cans in packaging is still very optimistic.

Which materials are better for the packaging of tea tin cans?

In the tea market, tinplate cans are what consumers are most keen on, so which materials are better? We understand from the following points.

Main properties of metal packaging materials

(1) Advantages

①The metal packaging material has high strength. Therefore, the wall thickness of the packaging container can be very thin, so that the weight is light, the strength is high, and it is not easy to be damaged.

For storage and transportation, it has good protection for commodities.

②The metal packaging material has an unique luster, which is convenient for printing and decoration, and makes the appearance of the product beautiful and gorgeous. In addition, metal foil and gold-plated film are ideal trademark materials.

③Metal packaging materials have good comprehensive protection performance. Metals have low permeability to water and gas, and are opaque, which can effectively avoid harmful effects such as ultraviolet rays. It has good comprehensive performance and can maintain the quality of the goods for a long time.Some packages are valid for up to two years.

④ Metal packaging materials are rich in resources and have good processing performance. The recoverable amount of steel on the earth is 1294 × 10 ° t, ranking first, followed by aluminum, which is 68 × 10 ° t. Metal packaging materials can be processed with different methods to produce containers of different shapes and sizes.

⑤The production of metal cans has a long history and the process is relatively mature. Now it has automated production and high production efficiency.

2) Disadvantages

①Pb and As in metals and solder easily penetrate into food and contaminate food; in addition, metal ions will also affect the flavor of food.

②When the metal container uses phenolic resin as the inner wall coating, if the processing technology is improper, it will also affect the quality of the food.

Main properties of several major types of metal packaging materials

(1) Steel

With rich steel resources and low production costs, it ranks first in metal packaging materials. The main properties of steel used as packaging materials are good comprehensive mechanical properties and certain corrosion resistance. In order to meet the requirements of comprehensive mechanical performance, the packaging steel plate mainly uses low-carbon thin steel plate, which is used to manufacture containers, ordinary steel drums, and can also be used as a strapping material, which is widely used in transportation packaging. In order to ensure the requirements of corrosion resistance, tin, chrome, aluminum, galvanization and the application of corresponding coatings can be carried out on the basis of low-carbon thin steel plates to improve their corrosion resistance. Can also be made into sales packaging containers, widely used in food, medicine and other packaging

 

Which materials are better for the packaging of tea tin cans?

Which materials are better for the packaging of tea tin cans?