engleski

EVALUATION OF ZIPPER TEAR STRIP DESIGN STRUCTURE FOR PAPERBOARD PACKAGING

Zipper tear strips (ZTS) are the most common user friendly, tamper-proof, opening system for paperboard and corrugated cardboard packaging. The base of ZTS design structure has parallel partial cuts repeated in the direction of the desired tearing line. The height (strip-width) of the tab can vary same as the shape in the cut design structure. In order to collect the most common zipper tear structure data, parameters were measured from samples of paperboard packaging found in a frequent Croatian supermarket. The obtained data was used to define 8 types of samples which were together with 4 new samples tested on two mainly used paperboards (250 g/m2 GC1 and 270 g/m2 GC2). Three type of tests were conducted: pull test for maximal tearing force, compression test to measure the structural degradation of a packaging and manual tearing to test the ZTS opening functionality success rate in real-life handling conditions. The results show that the 45° angle is most functional option and should be combined with the wider 13mm ZTS instead of the usual 10mm. Also, there is an indication that a 0, 5mm increase between cuts can slightly improve structural stability and when combined with the wider tab can attain an increased tear resistance while having the adequate opening functionality success rate.

Zipper tear strip ; tamper-proof opening ; paperboard packaging

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