Plastic anti-theft caps are the common packaging forms for bottle packaging, especially in the beverage field. According to their use, they can be divided into carbonated beverage caps (referred to as gas caps) and non-gas beverage caps (referred to as Contains no gas cover). Generally, polyolefin is used as the main raw material, and it is processed by injection molding, hot pressing and the like. The plastic anti-theft cap is required to be easy for the consumer to open, and it is also necessary to avoid leakage problems caused by poor sealing performance. How to properly control the sealing performance of the cap is the focus of the production unit online or offline detection.

The national standard GB/T17876-1999 specifically specifies the detection of the plastic anti-theft cap, such as the opening torque of the cap, thermal stability, drop resistance, leakage and sealing performance. Among them, the sealing performance and the opening of the cap and the tightening torque are effective ways to solve the sealing performance of the plastic anti-theft cap. Depending on the use of the cap, there are different regulations for the test methods that do not include a gas cap and a gas cap. If the gas cap is not included, the cap should be cut off and the anti-theft ring (strip) should be used for sealing the rated torque of not less than 1.2NM. Test with a seal tester, pressurize to 200 kPa, and keep the pressure under water for 1 minute to observe whether it leaks. Gas or tripping; the gas-containing cap is pressurized to 690 kPa, and the pressure is maintained under water for 1 minute. Observe the gas leak, and then increase the pressure to 1207 kPa, maintain the pressure for 1 minute, and observe whether the cap is tripped.

This article introduces Labthink's "LSSD-01 Leakage and Sealing Strength Tester" as an example. The instrument can be used for the quantitative measurement of leakage and sealing performance of standard plastic anti-theft caps (including gas caps and air caps) with various thread diameters of 28mm and 38mm. It can also be used for cap sealing torque indicators and caps. The connection trip strength and the whole bottle sealability, pressure resistance, and fracture resistance are evaluated and analyzed. Equipped with a special "plastic anti-theft cap sealing performance test device" as shown. The plastic anti-theft bottle cap is packaged with a special connecting unit link, placed in a transparent observation tank, and the test conditions such as test pressure or leakage are set to start the test. The instrument automatically performs the test, and the test data such as the test pressure and leakage amount can be directly on the LCD. Display on the LCD screen. At the same time, it can also be judged by transparently observing the condition of the bubbles in the tank.

The sealing performance of plastic anti-theft caps is the main factor affecting packaging leakage and product deterioration. By properly controlling the sealing performance, it can ensure its good opening performance and avoid leakage. The above is a brief introduction to the leak detection and sealing performance test of plastic anti-theft caps, hoping to help the quality control of the production and use units of plastic anti-theft caps.

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