The manufacturer of the capping machine introduces the test method for the sealing function of the cap

2020-12-30

The manufacturer of the capping machine introduces the test method for the sealing function of the cap


The sealing function of the bottle cap refers to the sealing ability of the bottle cap and the bottle mouth to prevent or slow down the leakage of liquid and gas inside the bottle body. For all plastic anti-theft bottle caps, sealing is one of the important functions. Today's capping machine The manufacturer will tell you about the test method of the sealing function of the bottle cap. Many outsiders may think that the sealing ability of the bottle cap is provided by the thread. In fact, the thread of the bottle cap and the thread of the bottle mouth are gap cooperation, without any sealing ability. Generally speaking , There are 3 areas where the bottle cap provides sealing ability, which are the inner sealing of the bottle cap, the outer sealing of the bottle cap, and the top sealing of the bottle cap.


Each sealing area has a certain amount of deformation with the bottle. This deformation amount is to constantly apply a certain force to the bottle C, so that a sealing effect occurs. Not all bottle caps will use three seals, and most bottle caps use inner seals. Sealing and outer sealing can be done. For bottle cap manufacturers, the sealing function of bottle caps is an item that needs to be continuously monitored, that is, the sealing function needs to be tested regularly. Perhaps many small-scale bottle cap factories seal bottle caps The test is not very important, and some people may choose the original and simple method to test the tightness, such as pressing the bottle cap with hand, stepping on the foot, etc. to test the tightness.


1. Non-carbonic acid cap: sealing requirements, no air leakage at 200kpa, no capping at 350kpa. After sealing the bottle cap with the rated torque, use a sealing test instrument to pressurize to 200kpa, and keep the pressure underwater for one minute to check whether there is leakage Then increase the pressure to 350kpa, keep the pressure for one minute, and check whether the cap comes out.


2. Carbonic acid cap: sealing requirements, no air leakage at 690kpa, no capping at 1207kpa. After sealing the bottle cap according to the rated torque, use a sealing test instrument to pressurize to 690kpa, and keep the pressure under water for - one minute to check whether there is leakage Then increase the pressure to 1207kpa, keep the pressure for one minute, and check whether the cap comes out.


The principle of the sealing tester is relatively simple, that is, screw the cap to be tested on the corresponding preform, inject compressed air, place the cap and preform under the water surface, and check whether there are bubbles emerging. It is also relatively simple, consisting of parts, 1, compressed air source. 2, excitation

Table.3, gas pipeline.4, main frame.5, liquid tank.6, pressure regulating valve.


The above is the whole content of the cap sealing function test method brought by the cap closing machine manufacturer Saiwei, and I hope it will be helpful to everyone.

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