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

2021-01-28

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 bottle cap thread and the bottle C thread are gap cooperation and have no sealing ability. There are 3 areas where the bottle cap provides the sealing ability, followed by the inner seal , bottle cap outer seal, bottle cap top seal.


Each sealing area has a certain amount of deformation with the bottle mouth. This amount of deformation is to constantly apply a certain force to bottle C, so that a sealing effect occurs. Not all bottle caps will use three seals, and most bottle caps use 3 seals. Inner sealing and outer sealing are enough. 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. The sealing test is not very important, and some people may choose the original and simple method to test the sealing, such as pressing the bottle cap with hand, stepping on the foot, etc. to test the sealing.


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 it to 200kpa, and keep the pressure underwater for one minute to investigate whether If there is air leakage, 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 with the rated torque, use a sealing tester to pressurize to 690kpa, and keep the pressure underwater 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 and consists of parts, 1, compressed air source. 2, excitation meter. 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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