What Are The Types Of Aerosol Cans?

What Are The Types Of Aerosol Cans?

With the rapid development of aerosol packaging, the canning industry has also grown rapidly. Aerosol cans are mainly divided into three categories according to the can body structure, one-piece cans, two-piece cans and three-piece cans.

One-piece cans, also known as aluminum cans, are currently widely used in the cosmetic and food packaging industries. It uses aluminum alloy sheet as material, and a thinning and stretching process is used in the manufacturing process, so the thickness of the tank wall is obviously thinner than the tank bottom. When a can is sealed at the mouth of the can, it does not match the two metals of different rigidity and strength with the iron lid. The internal pressure deforms the mouth of the can, causing many problems: the leakage probability of the medium in the can is extremely high; the water molecules in the outside are long Time is easy to exchange with the medium in the tank, and the moisture content increases geometrically with the increase of time; no pressure relief device can be installed on the tank.

Three-piece cans have been used for nearly 200 years, and traditionally consist of three parts: the can body, the can lid and the bottom. Although it has been improved many times, its structural form, which is basically composed of three metal sheets, the tank body, the tank bottom and the tank cover, has not undergone major changes. It is usually a can-shaped packaging container that is formed by crimping, bonding and resistance welding with metal sheet as the material. The advantages of three-piece cans are wide application range, low cost, simple manufacturing process, and the cost of can making equipment is within a controllable range. However, the shortcomings of the three-piece can are also very obvious, because of the seams of the can body, the pressure resistance is weak.

The two-piece can was developed by people in the 1950s. The development of modern technology has made it widely used in the daily chemical industry. Its structure consists of a can body and a can lid, so it is called a two-piece can. The tinplate metal sheet is stretched and formed by a punching machine to be stretched and deformed, so that the bottom and body of the tank are integrated. Therefore, the bottom and the side wall of the two-piece tank are integrated, and there is no seam seam between the side wall and the bottom of the traditional three-piece combined tank. It is these structural features that can be conveniently processed and modified on the upper and lower edges of the can body, which can not only improve the structural strength of the two-piece can, but also make the shape of the cylindrical container more beautiful. The bottom of the tank mainly plays the role of supporting the whole container. The shape of the bottom of the tank is mainly round and arched. The lower edge part is the connection part between the side wall and the bottom of the tank. It is often designed into a suitable shape with the bottom of the tank to ensure that the two-piece tank has sufficient structural strength and a proper appearance. In addition, the bottom of the tank can be made into a pressure relief device. When the internal pressure suddenly rises due to a certain temperature and extrusion on the outside of the tank, a pressure relief device is installed at the weakest stress point at the bottom of the tank to relieve the pressure, so as to protect the tank during use. life safety of the victim.