Tamper-evident plastic closure is widely used in current plastic bottle packing market, especially in the drink bottle packing. We could divide the tamper-evident plastic closure into carbonated soft drink closure and non-carbonated soft drink closure. Main plastic material of tamper-evident plastic closure is PP (polypropylene), through injection way and heat pressing forming technology to get the final product.Tamper-evident plastic closure should be convenient for customer to open and also need to avoid leakage problem due to the poor sealing performance. Therefore, reasonable way to test the tamper-evident plastic closure comes up to the keystone in the production process.

Standard testing method introduction:

Through checking the closure opening torque force, thermal stability, and drop-resistant performance could help us to estimate the tamper-evident plastic closure quality.

Among above methods, sealing performance and opening torque force is the most efficient way to test the tamper-evident plastic closure sealing performance.

For carbonated soft drink closure, put the bottle under the water, bring the pressure up to 690kPa and keep the bottle under this pressure in the water for 1 minute, and check the closure gas leakage condition. And then, add the pressure to 1207kPa, keep this pressure for 1 minute, and check the tamper-evident plastic closure happen disengaging or not.

For non-carbonated soft drink closure, first to peel off the tamper-evident band and use rated torque force which is not less than 1.2NM to close the closure tightly. Then put the bottle under the water lasting for 1 minute, at the same time bring the pressure up to 200kPa. At this moment, check whether the temper-evident plastic closure happen gas leakage and disengaging.

Tamper-evident plastic closure sealing performance is the mainly factor affect the product deterioration. By reasonable control to the tamper-evident plastic closure sealing performance could we guarantee the bottle cap good opening performance and the same time avoid leakage happening.

How to test the tamper-evident plastic closure sealing performance?

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