The Falling Dart Impact Tester is intended for the determination of mechanical properties of packaging material such as plastic films, laminates and paper.
The tester comprises a horizontal base-plate on which a vertical column of steel has been erected and which on its top carries a release mechanism in which the falling dart can be inserted.
The dart consists of a hemispherical part of aluminum with polished surface and a diameter of 38.1 mm (1.5 in.), having a vertical shaft in the center of the flat top surface. Around the shaft additional weights can be fitted.
On the base-plate in the vertical center line of the inserted dart, a circular clamping device has been fitted. This clamping device consists of a firm and a movable cylinder, both having an inner diameter of 127 mm (5 in.).
By means of a handle operated excenter, a sample can be clamped slippage free between both cylinders.
The bottom of the firm cylinder has been provided with a 2-3 mm thick disc of soft rubber in order to eliminate damage of the falling dart.