Testing machines for paper materials - Zwick - #29

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29 Box Crush and Stacking Crush Tests These tests are used to determine the strength and the stacking capabilities of corrugated board boxes (Fig. 2). The complete box is compressed to a specified load or until failure. The European Standards require rigid compression plates if the behaviour of a box is being tested by loading it on opposite corners or sides. The upper plate must be spherically pivoted when loading the box on opposite surfaces. However, TAPPI always requires rigid compression plates. The European Standards distinguish between the Box Crush Test and the Stacking Crush Test. In the Box Crush Test, the corrugated board carton is loaded steadily to nominal load or until failure. In the Stacking Crush Test, a certain load is held constant for a certain time or until failure of the box. Fig. 2: Box-crush tester for specimen up to a footprint of 2 m by 2 m (authorized by SCA Packaging Research, European Technical Centre, Aylesford) Standard DIN 55437 Material paper, board Item numbers Creasing tool 618337 Load cell Fmax 2.5 kN e.g. Type II, 318942 Test Program 618336 For specimens length 40 mm width 50 mm To testing machines from zwicki-Line Standard Box crush test ISO 12048 / EN 22872 TAPPI T 804 Stacking test EN 22874 Material corrugated board Item numbers Compression plates 400 x 400 mm 317942* 400 x 600 mm 317944* Special versions on request Load cell (from Fmax 5 kN) e.g. Type II, 318940 Test Programs Box crush test 347178 Stacking test 357693 For specimens length x width x height Boxes according to the machine´s test space To testing machines from Allround-Line Fig. 1: Laboratory creasing: force-deformation characteristics Machines, either standard or to customer specifications, also offer correct applicable solutions for combined tests. The advantages: • Standard and customer specific machines for optimal testing • Available solutions for box widths up to 2000 mm * These accessories require connecting elements and software to be specified according to the machine. * These accessories require connecting elements and software to be specified according to the machine.