Abstract
The required forces for opening the safety closures of three reclosable packagings were measured at initial and after 60 opening and closing, and child resistant characteristics of those packagings were estimated by sequential test method, which reduces test subjects without changing the statistical parameters while permitting the same prediction accuracy with the PPPA (Poison Prevention Packaging Act) test method. As the results of the sequential tests, these packagings were statistically confirmed as child resistant materials under given conditions.
Trials had shown that people in the age group over 61 had not great difficulty in opening child resistant packagings. Then it seemed that there was no need for the age group (61-65 years) to be tested specially.
