Optimization of Transport Simulation for Infusion Bags : - A Study of Wear on Plastic Packaging

Sammanfattning: This report presents a method for transport simulation of infusion bags. A cardboard box filled with infusion bags have been vibrated with an in house developed shake rig, using fixed frequency and horizontal direction. The method has been able to fabricate the same transport damages in the plastic packaging as seen on reclaimed products, but has also produced some other damages. Heating of the plastic packaging due to the frequent high acceleration strokes that initiate adhesion wear probably causes the additional damages.  Further testing is needed for the method to be fully optimized. Analyzing the motion of the bags within the cardboard box when vibrated by making tests with an open lid and then analyzing the motion with a high-speed camera have distinguished the motions causing transport damages. To normalize between different vibration tests a formula using impulse to describe accumulative fatigue wear has been derived. Basquin´s formula for time compression together with literature data has been used for simulation of transports to China and Mexico. A tribology wear test rig has also been developed for testing of plastic films against different counter surfaces. The set up tests the films against abrasive and adhesive wear and have a good repeatability. Optical light microscopy has been used to analyze the wear marks.