Seal Strength Testing
The efficacy of heat seals is often detailed in governing specifications, contracts, and regulations. Quality management systems sometimes ask for periodic subjective evaluations: For example, some seals can be evaluated by a simple pull to determine the existence of a bond and the mechanism of failure. With some plastic films, observation can be enhanced by using polarized light which highlights the birefringence of the heat seal. Some seals for sensitive products require thorough verification and validation protocols that use quantitative testing. Test methods might include:
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Famous quotes containing the words seal, strength and/or testing:
“Shut not so soon; the dull-eyed night
Has not yet begun
To make a seizure on the light,
Or to seal up the sun.”
—Robert Herrick (1591–1674)
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—Anna Garlin Spencer (1851–1931)
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—John Michael Hayes (b.1919)