Experimental observations on the melt temperature variation in the barrel of injection molding machine are reported in this article. To examine the temperature variation in depth, the accuracy of temperature sensor should be much higher than the sheathed thermocouple used widely in the field. A novel temperature sensor with a less heat capacity than the usual sheathed type sensors was developed in this study. The effects of some process conditions on the variation were examined. The experimental results showed that the melt temperature in the barrel was affected by the process conditions such as the screw rotation speed and the heater temperatures as well as the injection rate. Also additional conditions such as the shot volume, the dwell time after plasticizing and the length of feeding section were examined.
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