Standard test method for plastic caps

The national standard GB/T17876-1999 specifically stipulates the detection of this plastic anti-theft bottle cap, such as cap opening torque force, thermal stability performance, drop resistance, leakage and sealing performance, etc. Among them, the evaluation of sealing performance and cap opening and torque torque is an effective way to solve the sealing performance of plastic anti-theft bottle caps. Depending on the purpose of the cap, there are different regulations for the measurement method without air cap and with air cap. SEALING THE CAP (EXCLUDING AIR CAP) NEEDS TO CUT OFF THE ANTI-THEFT RING (STRIP) OF THE BOTTLE CAP, FOR THE RATED TORQUE SEAL OF NOT LESS THAN 1.2NM, TEST WITH A SEAL TESTER [1], PRESSURIZED TO 200kPa, MAINTAIN THE PRESSURE UNDER WATER FOR 1 MINUTE, AND OBSERVE WHETHER THERE IS AIR LEAKAGE OR TRIPPING; The breathable cover (including the air cover) is pressurized to 690kPa, and the pressure is maintained under water for 1 minute to observe whether there is air leakage, and then the pressure is increased to 1207kPa, and the pressure is maintained for 1 minute to observe whether the plastic cover is tripped.