Pull-Tear Strength Capabilities in Adults

Forty-four adults between the ages of 22 and 40 years were tested for maximal volitional pulls with the fingers, similar to some pull-tear forces employed for opening packages with tear strips. Twelve different pull conditions were tested-3 types of pull X 2 directions of pull X 2 hands. Results indicated that the type of pull, characterized by the type of pinch employed, had marked effects on the force attainable, but direction and hand laterality were not significant factors. These results have important implications for design of tear strips on packages.