1. There is a ring-shaped leak-proof ring on the inner wall of the top of the general plastic cover; there are also ordinary plastic bucket covers that need to be matched with the inner cover, so there is no need to design a leak-proof ring;
2. The lower end of the plastic cover is connected with an anti-theft ring through a tension stiffener;
3. At the same time, there are several flaky gyrating pull wings evenly distributed on the inner wall of the anti-theft ring;
The plastic bucket lid designed in this way has the characteristics of firm sealing, good leak-proof and anti-theft performance, safe and convenient use, can effectively prevent the liquid in the container from external pollution, and can ensure that the packaging of various liquid products meets national safety standards.
Bottle cap inspection
So how to reasonably control the sealing performance of plastic caps is the focus of the online or offline testing of the production unit. For plastic anti-theft bottle caps, because the degree of sealing is to be tested, a positive pressure sealing tester is used, but the positive pressure sealing in the market The tester uses compressed air directly into the sealed container, so that it will inevitably explode when the container is defective. According to expert calculations, if a 2.5-liter Coke bottle explodes at 1.2 MPa, it is quite destructive. For 100-150 grams of explosives.
Standard test method
The national standard GB/T17876-1999 specifically specifies the detection problems of this plastic anti-theft bottle cap, such as cap opening torque, thermal stability, drop resistance, leakage and sealing performance. Among them, the evaluation of the sealing performance and the opening and tightening torque of the bottle cap is an effective way to solve the sealing performance of the plastic anti-theft bottle cap. According to the different uses of bottle caps, there are different regulations for the measurement methods of airless caps and air-containing caps. The sealing cap (not including the air cap) needs to cut off the anti-theft ring (bar), and use it for sealing with a rated torque of not less than 1.2NM. Test with a sealing tester pressurize to 200kPa, and keep it under water Press the pressure for 1 minute to observe whether there is air leakage or tripping; pressurize the breathable cover (with air cover) to 690kPa, keep the pressure underwater for 1 minute, observe whether there is air leakage, and then increase the pressure to 1207kPa and keep the pressure for 1 minute. Observe whether the plastic cover has tripped.