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The airtightness of plastic bottle caps such as food and beverage bottle caps is very important for the protection of the product, which can effectively ensure the validity period of the food and its safety and sanitation. Plastic anti-theft bottle caps are not only required to be easy for consumers to open, but also to avoid leakage problems caused by poor sealing performance. How to use a professional sealing tester to reasonably control the sealing performance of bottle caps is the focus of online or offline testing of production units.

For plastic anti-theft bottle caps, a negative pressure sealing tester is used because of the need to test the degree of sealing . The national standard GB/T17876-1999 specifically specifies the opening torque, thermal stability, and tightness testing of the plastic anti-theft bottle cap. 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 test methods for the airless caps and the air caps. If the air cap is not included, the anti-theft ring (strip) must be cut off the bottle cap and used for sealing with a rated torque of not less than 1.2NM, and tested with a seal tester 

The test principle is: pressurize to 200kPa, keep the pressure underwater for 1 minute to observe whether there is air leakage or trip; pressurize the air cap to 690kPa, keep the pressure underwater for 1 minute, observe whether there is air leakage, and then Increase the pressure to 1207kPa, keep the pressure for 1 minute, and observe whether the cap is tripped.

The MFY series positive pressure tightness tester developed by Saicheng is professionally used for the quantitative determination of the leakage and sealing performance of various standard plastic anti-theft bottle caps (with and without gas caps) with thread diameters of 28mm and 38mm. To evaluate and analyze the torsion sealing index of the bottle cap, the breaking strength of the cap connection and the sealing performance, compression resistance, and breaking resistance of the entire bottle body. Equipped with a special "plastic anti-theft bottle cap sealing performance test device", as shown in the figure. The plastic anti-theft bottle cap is encapsulated with a dedicated connection unit and placed in a transparent observation tank. After setting test conditions such as test pressure or leakage, the test is started. The instrument automatically performs the test. Test data such as test pressure and leakage can be directly displayed on the LCD Display on the LCD screen. At the same time, it can also be judged by the transparent observation tank.

Plastic anti-theft caps sealing performance is a major factor in the packaging and product deterioration leak affected by race as MFY cap seal tester for the reasonable control of the sealing performance which can ensure its good opening performance, and also avoid leakage generated.

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