Tear tester

Internal Tearing Resistance of Paper

This method measures the force perpendicular to the plane of the paper required to tear multiple sheets of paper through a specified distance after the tear has been started using an Elmendorf type tearing tester. The measured results can be used to calculate the approximate tearing resistance of a single sheet.

When paper is subjected to high stresses in converting machine operation and handling equipment, good tearing resistance is very important. Also to achieve a higher puncture resistance result of the board, a higher tearing of the paper is desired.

One or more sheets of the sample material are torn through a fixed distance by means of the pendulum of an Elmendorf type tearing tester. The work done in tearing is measured by the loss in potential energy of the pendulum. The instrument scale is calibrated to indicate the average force exerted when a certain number of plies are torn together (work done divided by the total distance torn).

Tearing Resistance Tester using Elmendorf principle consists of a pendulum with graduated scale, a stationary clamp and a movable clampcarried on the pendulum formed by a sector of a circle for free swing on a ball bearing, a knife mounted on a stationary post for starting the tear, two leveling bolts, means for holding the pendulum in a raised position and for releasing it instantaneously, and a pointer for registering a maximum arc when the pendulum swings when released.

STANDARD COMPLIANCETAPPI T-414 om-88, IS 4006 (part II)1972, AS/NZ 1301.400s, DIN 53128, SCAN P11,BS EN 21974CPPA D9.