Table 3. Comparison of Tearing Parameters among Four Groups with Different Tearing Behaviors.

		group 1 (G1)	group 2 (G2)
thickness, t (mm)	average	0.72	0.69
	SD	0.13	0.09
	CoV	0.2	0.1
max. force, Ftear (N)	average	17.1	17.9
	SD	4.2	4.3
	CoV	0.2	0.2
tear strength, Stear (kN/m)	average	24.3	25.8
	SD	6.7	5.5
	CoV	0.3	0.2
tear energy, Etear (kN/m)	average	48.6	51.5
	SD	13.5	11.0
	CoV	0.3	0.2
work done, Wtear (N mm)	average	1329	859
	SD	346	438
	CoV	0.3	0.5