RESEARCH AND EXPERIMENT ON A LASER MICRO - PERFORATION METHOD FOR POLYETHYLENE (PE) FILMS USED IN AGRICULTURAL PRODUCT PRESERVATION

Abstract

This paper presents the results of research and experimentation on a CO2 laser-based micro-perforation method for Polyethylene (PE) films. This technique is intended for application in Modified Atmosphere Packaging (MAP) technology to extend the shelf life of fresh produce and foodstuffs. The system utilizes an RF-CO2 laser source with a power of approximately 30 W and a wavelength of 10.6 µm. This source is coupled with a 20 mm diameter galvo beam scanner and an F-theta focusing lens with a focal length of 150 mm, enabling the creation of micro-holes with diameters around 100 µm over a processing area of 110×110 mm. By integrating a rotary axis and a motor-driven roller system controlled by stepper motors, the system achieves continuous, automated perforation on PE film rolls ranging in thickness from 30 to 80 µm. Experimental results demonstrate that the diameter of the micro-holes produced on the PE film ranges from 80 to 150 µm, which is dependent on the set parameters and film thickness. The paper also provides some preliminary results regarding the practical storage preservation of strawberries and peeled durian using this micro-perforated PE film.