Cap sealing performance test method introduced by cap closing machine manufacturers
The sealing function of the bottle cap refers to the sealing ability between the bottle cap and the bottle mouth to block or slow down the leakage of liquid and gas in the bottle. For all plastic anti-theft bottle caps, sealing is one of the important functions. Today, The manufacturer of the capping machine 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, but in fact the thread of the bottle cap and the thread of the bottle mouth are clearance fit, there is no Any sealing ability. Generally speaking, there are 3 areas where the bottle cap can provide sealing ability, which are the inner seal, the outer seal and the top seal of the bottle cap.
Each sealing area has a certain amount of deformation with the bottle, that is, the deformation continuously exerts a certain force on the bottle C, resulting in a sealing effect. Not all bottle caps use a 3-way seal, but most bottle caps use an inner seal and an outer seal Sealing. For bottle cap manufacturers, the sealing function of the bottle cap is an item that needs continuous monitoring, that is, the sealing function needs to be regularly tested. Maybe many small-scale bottle cap factories do not pay much attention to the sealing test of bottle caps. Some people may choose the original simple method to test the sealing performance, such as hand squeezing and foot pressing after the bottle cap is sealed.
1. Non-inflatable cap: sealing requirements, no air leakage at 200kpa, no capping at 350kpa. After the bottle cap is sealed at the rated torque, pressurize it to 200kpa with a sealing tester, and keep the pressure underwater for one minute to check whether there is leakage Then pressurize to 350kpa, keep the pressure for one minute, and check whether the cap comes out.
2. Carbonate cap: sealing requirements, no air leakage at 690kpa, no capping at 1207kpa. After the bottle cap is sealed with the rated torque, use a sealing tester to increase the pressure to 690kpa, keep it underwater for -min, to investigate whether there is leakage Then increase the pressure to 1207kpa, keep it for one minute, and check whether the cap comes out.
The principle of the sealing and testing instrument is relatively simple, that is, screw the cap to be tested on the corresponding preform, inject compressed air, put the cap and preform below the water level, and check whether there are bubbles emerging. Its structure is relatively simple, consisting of Several parts. 1. Compressed air source. 2. Excitement, excitement
Table. 3. Natural gas pipeline. 4. Main frame. 5. Liquid tank. 6. Pressure regulating valve.
The above are all about the test method of the cap sealing function brought by the cap closing machine manufacturer Saiwei. I hope it will be helpful to everyone.
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