The change of temperatures, even 1C, affect the viscosity of the material. Therefore, temperature and heat control of the extruder is so important. From the extruder manufactured and the test made with PD derivative control system after 50C, however, it was concluded that the control of the heat of resistance should be PID control system due to necessity of
sensitive heat control of polymer which is affected with 1C temperature change. In the experiments,type J heat element used, but the results indicated that PT 100 would be more beneficial.