Infrared Thermographic Evaluation of Heat-seal Quality in Heat-sealed Areas of Liquid Packaging Bags Made of Plastic Film

摘要

The temperature on the surface of the heat-sealed area of liquid packaging bags made of laminated plastic film was measured by infrared thermography to learn the effect of temperature of heat-sealing plates and the rate of film feed on quality of the seal. Such quality is evaluated on the basis of whether or not there is separation between the heat-sealed films. Distribution of temperatures on the surface of the heat-sealed areas was shown to be useful to evaluate the heat-seal quality.