Abstract
To investigate the relationship between the tearing success rate of the E-flute zipper lines and the forward cut length of these zipper lines, the forward cut length was changed in the tearing test while maintaining the connecting portions’ length (uncut length) at 3.0 mm, the width of the zipper band at 12.0 mm, and the pulling velocity at 1.0mm/s. The experimental results show that the tearing success rate of the connecting portions increases with the increase in the forward cut length due to the increasing of the horizontal (in-plane) shear displacement by the vertical (out-of-plane) uplift of the forward cut zone band. The lower and upper complementary-critical lengths of 5.0 and 9.0 mm of the forward cut length, respectively, against the uncut length of 3.0 mm were revealed. Two kinds of bent-dented wrinkles and the corresponding two patterns of the tearing force were observed. These are statistically determined by the crossed (glued) position of the corrugated medium and upper/lower liner against the starting /ending position of the connecting portion.
