Leak tester is often referred to as vacuum/negative pressure method, or bubble emission method，which is used as gross leak checking for flexible packages(with headspace gas) by eye observation.

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Leak tester is often referred to as vacuum/negative pressure method, or bubble emission method，which is used as gross leak
checking for flexible packages(with headspace gas) by eye observation.

Leak tester is often referred to as vacuum/negative pressure method, or bubble emission method，which is used as gross leak
checking for flexible packages(with headspace gas) by eye observation.