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How to open plastic seals in perfect way?

From the appearance of plastic seals, it is composed of two parts, one end is a square plastic mouth with a hook and the other end is plastic seal itself with sawtooth. The seal itself can bend and penetrate the front plastic mouth and form loop, similar as belt on pants, to seal wire cable.
Its function is simple. The sawtooth is used to lock plastic seal which make it impossible to pull out. The commonly used materials are pp which has strong stiffness, not soft as ordinary plastic.
After knowing its structure, it seems impossible to open plastic seals in a perfect way.
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