Types and structural principles of bottle cap sealing requirements

Update:19 Jan 2021

Generally speaking, the sealing performance of the bottle cap is the sealing performance of the bottle mouth and the cap. The good sealing performance of the bottle cap can prevent the leakage of gas and liquid in the bottle. For the plastic bottle cap, the sealing performance is an important standard to evaluate its quality. Some people think that the sealing performance of the bottle cap is determined by the thread. In fact, this idea is wrong. In fact, the thread does not help the sealing performance of the bottle cap.

Generally speaking, there are three areas for bottle cap to provide sealing ability, which are inner seal, outer seal and top seal. Each sealing area has a certain amount of deformation with the bottle mouth, which means that a certain force is constantly applied to the bottle mouth to produce a sealing effect. Not all bottle caps will be sealed with three seals. Most bottle caps can be sealed with inner seal and outer seal.

For the manufacturers of bottle caps, the sealing performance of bottle caps is a project that needs continuous monitoring, that is, the sealing performance needs to be tested regularly. Perhaps many small-scale bottle cap manufacturers do not pay much attention to the sealing test of bottle caps, and some people may use primitive simple methods to test the sealing performance, such as hand squeezing and foot stepping after sealing the bottle caps .

In this way, the sealing inspection can be carried out regularly during the production of bottle caps, so as to reduce the risk of production quality accidents. I believe this information can be of great help to all bottle cap factories. According to the requirements, the sealing requirements are divided into the following two categories, so our sealing standard is implemented according to the following requirements. Of course, the cap factory can also improve the test standard according to the cap performance.
To test the sealing of the bottle cap, you can use the sealing test instrument. The basic principle and structure of the instrument are introduced to you.
The principle of the sealing tester is relatively simple, that is, screw the bottle cap to be tested on the corresponding bottle embryo, inject compressed air, place the bottle cap and bottle blank under the water level, and observe whether there are bubbles. Its structure is also relatively simple, which is composed of the following parts: compressed air source; pressure gauge; gas pipeline; main frame; liquid tank; pressure regulating valve.