Standard Test Method For Plastic Covers

The national standard GB/T17876-1999 specifically stipulates the detection problems of this plastic anti-theft bottle cap, such as the cap opening torque, thermal stability, drop resistance, leakage and sealing performance. Among them, the evaluation of sealing performance and bottle cap opening and tightening torque is an effective way to solve the sealing performance of plastic anti-theft bottle caps. According to the different uses of bottle caps, there are different regulations for the measurement methods of non-air caps and air caps. For sealing caps (excluding gas caps), the anti-theft ring (strip) needs to be cut off from the bottle caps for sealing with a rated torque of not less than 1.2NM, tested with a sealing tester [1], pressurized to 200kPa, and kept under water Press the pressure for 1 minute to observe whether there is air leakage or tripping; pressurize the vent cover (including the air cover) to 690kPa, keep the pressure under water for 1 minute, observe whether there is air leakage, and then increase the pressure to 1207kPa, keep the pressure for 1 minute, Watch to see if the plastic cover comes off.