The butterfly cap closing machine manufacturer introduces you to the test method of the sealing function of the bottle cap.
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. Many foreign One might think that the sealing ability of the bottle cap is provided by the thread, which is a big mistake. The thread of the bottle cap and the thread of the bottle mouth are a clearance fit and do not have any sealing ability. Generally speaking, the sealing of the bottle cap is provided There are 3 areas of ability, which are the inner seal of the bottle cap, the outer seal of the bottle cap and the top seal of the bottle cap.
Each sealing area has a certain amount of deformation with the bottle mouth, and this deformation amount continuously exerts a certain force on the bottle mouth, resulting in a sealing effect. Not all bottle caps use a 3-way seal, but most bottle caps use an inner seal 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 tested regularly. Maybe many small-scale bottle cap factories do not pay much attention to the sealing performance of the bottle cap. In the test, some people may choose the original simple method to test the sealing performance, such as hand squeezing and foot stepping after the bottle cap is sealed. Next, Tongcheng Saiwei Automatic Packaging Equipment Factory, the manufacturer of butterfly cap closing machine, will introduce reliable The method of testing the tightness of bottle caps, and teach us how to make an easy-to-use tightness testing instrument, so that we can conduct regular tightness testing when producing bottle caps and reduce the risk of production quality accidents. I believe this information is very useful for each bottle. The factory is a great help.
A standard sealing machine on the market costs about tens of thousands of RMB, and some big brands such as Labthink are more expensive. Let us introduce the basic principle and structure of the instrument, so that the bottle cap factory can process a standard sealing test by itself The manufacturing cost of the instrument is about 23,000 yuan.
According to the requirements of the People's Republic of China plastic anti-theft bottle cap standard GB\/T 17876-2010, the sealing requirements are divided into the following 2 categories, so our sealing standard is implemented according to the following requirements. Of course, the bottle cap factory can also follow the bottle cap function.
1. Cover without CO2
Sealing requirements: no air leakage at 200kpa, no cover at 350kpa.
Test method: After the bottle cap is sealed according to the rated torque, pressurize it to 200kpa with a sealing tester, keep the pressure under water for one minute, check whether there is air leakage, then pressurize to 350kpa, keep the pressure for one minute, and check whether the bottle cap comes off .
2. Carbonate Overlay
Sealing requirements: no air leakage under 690kpa pressure, no cover under 1207kpa pressure.
After sealing the bottle cap with the rated torque, pressurize it to 690kpa with a sealing tester, keep the pressure underwater for one minute to check whether there is air leakage, then pressurize it to 1207kpa, keep the pressure for one minute, and check whether the bottle cap comes off.
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, place the cap and the preform below the water level, and check whether there are bubbles emerging. Its structure is relatively simple, consisting of The following parts are composed of: 1. Compressed air source; 2. Pressure gauge; 3. Gas pipeline; 4. Main frame; 5. Liquid tank; 6. Pressure regulating valve.
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