The screw barrel temperature is an important process parameter as it directly influ­ences the properties of the end product. The melting of the polymer matrix takes place in the screw barrel. It is divided into various heating zones from feeding zone to the nozzle. The temperature of these zones depends upon the processing tem­perature of polymer matrix used. The temperature of the heaters has to be adjusted carefully as heating of the mixture in the barrel is not only done by the heaters alone. The shearing action of the screw also provides some heat during plasticizing. The viscosity of the fiber matrix mixture reduces as the temperature is increased but at the same time higher temperatures can lead to degradation of matrix as well as natural fibers used.