抄録
The temperatures on the surfaces of heat-sealed areas in liquid packaging bags made of laminated plastic films (e.g., nylon, polyethylene and linear low-density polyethylene) were measured to investigate the effects of temperatures of heat-sealing plates and film feed rates on the heat-seal quality of films in heat-sealed areas, which was evaluated on the basis of whether separation between heat-sealed films is present. Thermal images were taken immediately after heat sealing using an infrared thermography technique at heat-sealing temperatures in the range of 100 to 190℃ and at film feed rates in the range of 10 to 20m/min in an automatic packaging machine. In addition, the temperatures of the heat-sealed areas were analyzed by finite-element analysis. The results revealed that the distributions of temperatures on the surfaces of the heat-sealed areas could be used to evaluate the heat-seal quality.
