Diseño y construcción de un equipo para ensayo de impacto por caída de dardo conforme a la norma ASTM D1709-15

Abstract

This paper presents the design and construction of a dart drop impact testing equipment, according to ASTM D1709-15. Considering the requirements of this standard, a functional analysis of sub-systems is performed to obtain the characteristics of the film holding system and the dart release system. The film holding system includes 2 pneumatic actuators of 50 millimeters in diameter, a fixed and a mobile ring. It maintains a film up to 0.8 mm thick without slipping after the impact of 2000 g dart released from 150 cm height. The dart release system comprises a 10 mm diameter anti-rotating actuator, a release element and a sensor. It can release a 2000 g dart using a pressure of 3.5 bar. The electrical and electronic design focuses on a programmable logic controller and operator panel, for which a control application and a report downloader are developed. Finally, two polypropylene based plastic films used in food packaging are tested. It should be noted that not all plastic films can be characterized by this method, particularly when the fail impact energy is too low.