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Falling dart impact tester

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article image Falling dart impact tester

The Ray-Ran Advanced Falling Dart Impact Tester, brought to you by Hylec Controls , has been designed to determine the impact resistance of plastic films, papers and composite sheets by use of a free falling dart. This instrument complies with the ASTM D1709 Method A & B and ISO 7765.

The sample is clamped in position, and a dart of known weight is allowed to fall from a either 660mm or 1500mm and hit the sample. The energy required to break the samples is expressed in terms of the weight (mass) of the dart which would result in the failure of 50% of test pieces taken from the sample under test. The test methods are designed to enable the operator to achieve the result by extrapolation from the figures obtained by testing at a number of different drop weights, on a significant number of test specimens. The determination of the result is obtained using the staircase method. The dart weight is decreased or increased by uniform increments after each test, depending on the result (failure or no failure) in the specimen.


Standard features include

Variable height from 660mm to 1525mm, 38.1mm and 50.8mm Spherical headed darts, Binary weight set, Manual clamping, Advanced dedicated microprocessor control, Touch membrane Alpha / Numeric keypad for data entry, LCD display for sequence logic menu auto prompt selection, Yes / no mode selector, RS232 output with data transfer lead, Specview “ Scada” software to allow PC control of Tester and real-time viewing of results, Self-calibration procedure, Results downloaded to PC for spreadsheet analysis, Metric units of measure, Ability to store User Names and Material Types, Recipe Manager to store and upload data, High resolution positional encoder, Solenoid dart release, Levelling device, Full safety guarding electrically inhibiting operation when not closed, Fully traceable certificate of calibration, Product user manual, CE mark of conformity.

Test Description
The Ray-Ran falling dart impact tester provides a method for determining the energy that causes thin flexible material such as plastic film, paper and composite sheets to fail under specified conditions of impact from a free falling dart and determines the energy required to tear or puncture the film. The energy is expressed in terms of the weight (mass) of the dart which would result in the failure of 50% of test pieces taken from the sample under test. It is highly unlikely that an operator could exactly select a weight value which would achieve this 50% failure result. Therefore, the test methods are designed to enable the operator to achieve the result by extrapolation from the figures obtained by testing at a number of different drop weights, on a significant number of test specimens, all cut from the same master sample of film. The determination of the result is obtained using the staircase method. The dart weight is decreased or increased by uniform increments after each test, depending on the result (failure or no failure) in the specimen.

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