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:
“What is the seal of liberation?—No longer to be ashamed in our own presence.”
—Friedrich Nietzsche (1844–1900)
“Perfect little body, without fault or stain on thee,
With promise of strength and manhood full and fair!”
—Robert Bridges (1844–1930)
“Is this testing whether I’m a replicant or a lesbian, Mr. Deckard?”
—David Webb Peoples, U.S. screenwriter, and Ridley Scott. Rachel, Blade Runner, being tested to determine if she is human or machine (1982)