Testing                                                                                                                                    Tearing Resistance

Tearing Resistance

General 

The tearing resistance is usually greater in the cross direction than in the machine direction.

Equipment

Ballistic type of tear-tester, such as the Elmendorf, is recommended. The machine is provided with two clamps, the one fixed and the other carried on a sector-shaped pendulum, suspended from a column by means of a frictionless bearing located near the apex of the sector. On releasing the pendulum, the centre tongue is subjected to the load of pendulum recorded through a spring loaded friction pointer on the circumferential scale marked on the pendulum.

Tear Factor

used for comparing two papers with regard to their tearing strength and is calculated as follows:

Tear Factor =Tearing resistance / Substance

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