Fact or friction: a model for understanding the openability of wide mouth closures

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<jats:title>Abstract</jats:title><jats:p>Understanding and improving openability is becoming more and more important in the packaging industry. Specific tests or focus groups can be used to determine whether users have problems with packaging; however, these are both time consuming and expensive. This paper outlines a method by which it is possible to predict openability for any kind of closure by utilizing simple and quick tests, and by mathematically adapting strength test data. The method is demonstrated on wide mouth closures, and shows that there are optimum values for jar diameter and friction for containers of this type to enable increased openability. The data indicates that the optimum diameter for a jar lid is around 73mm, and therefore lids of this diameter are the easiest for consumers to open. The process outlined can be used to improve openability of packaging while keeping costs to a minimum. Copyright © 2007 John Wiley & Sons, Ltd.</jats:p>

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