Seal strength testing
At Qipack, we understand how important reliable packaging seals are for protecting products, maintaining shelf life and preventing costly production issues. Seal strength testing plays an important role in modern packaging quality control by ensuring that heat-sealed packaging performs consistently under real production and transport conditions. For manufacturers working with flexible packaging, thermoforming, tray sealing, pouch-making and other heat-sealing applications, maintaining strong and consistent seals is essential.
✓ Custom solutions
✓ In-line packaging inspection
✓ Real-time process optimisation
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production process
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What is seal strength testing?
Seal strength testing is a method used to measure the durability and integrity of a package seal. The purpose of seal strength testing is to determine whether a seal is strong enough to protect the product throughout production, transport, storage and end use. During the heat-sealing process, heat, pressure and time combine to create a sealed bond between packaging materials. Seal strength testing evaluates how effectively these materials have fused together and whether the seal meets the required quality standards.
Reliable seal strength is especially important in industries such as:
- food packaging
- pharmaceutical packaging
- medical packaging
- pet food packaging
- flexible packaging production
Weak or inconsistent seals can result in:
- product contamination
- packaging leaks
- reduced shelf life
- rejected batches
- costly recalls
For this reason, seal strength testing is a big part of packaging quality assurance and process optimisation.
How to test seal strength
Seal strength can be tested using several methods, depending on the packaging material, product type and production environment. Traditional seal strength testing methods often involve destructive laboratory testing, where seals are physically pulled apart to measure the force required to separate the materials. While effective, these methods are typically performed offline and only on sample products. At Qipack, we focus on advanced in-line inspection technology that continuously monitors seal integrity during production. Using high-definition infrared imaging and sophisticated software analysis, our systems can detect:
- pressure inconsistencies
- incomplete polymer fusion
- sealing defects
- laminate irregularities
- contamination within the seal
- thermal inconsistencies
This enables manufacturers to identify potential seal strength issues immediately, without interrupting production or damaging the packaged product. By combining thermal inspection with process monitoring, manufacturers gain greater control over packaging quality and production reliability.
Qipack’s 3 step approach
How we guide your enterprise in reaching its packaging quality targets:
- Audition of the packaging line
- Packaging process improvement
- Online production monitoring
Seal strength testing guidelines
Consistent seal strength testing requires stable production conditions and accurate monitoring of the heat-sealing process. Important factors that influence seal strength include:
- sealing temperature
- sealing pressure
- dwell time
- packaging material quality
- laminate consistency
- contamination within the seal area
To achieve reliable seal quality, manufacturers should:
- continuously monitor sealing parameters
- perform regular packaging quality inspections
- identify process variations early
- maintain stable production conditions
- use advanced inspection technology for real-time analysis
Improve packaging quality with our solutions
At Qipack, we help manufacturers improve packaging quality, reduce production losses and optimise sealing performance through seal inspection technology. Would you like to improve your seal strength testing process and achieve more reliable packaging quality? Contact us to discover how our solutions can optimise your packaging production environment.
