In an article published in July 2019 by Packaging Technology and Research, author Claire Sands discusses testing packaging seals and ensuring their integrity in alternative packaging types. “With the renewed interest in sustainable packaging, alternate structures such as monolayer recyclable flexible packaging are being explored, so ensuring that the seals for these structures maintain their strength is essential,” Sand writes. The article describes and compares various test methods that can be used including the gas leak test, ultrasonic seal test, vacuum decay test, bubble emission test, dye penetration test, and seal strength test.

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Claire Koelsch Sand (July 2019). “Testing the Integrity of Package Seals.” Packaging Technology and Research